# Sample Questions for the First Semester Final Exam

The possible choices are purposely NOT listed.

The final exam usually has 100 questions PLUS a free response (questions with calculations to be shown for the answers to be found)

Multiple Choice

Choose the best answer to each question. Write the letter for that answer

to the left of the question number.

1.      Speed is

2.      One possible unit of speed is

3.      When you look at the speedometer in a moving car, you can see the car's

4.      Suppose you take a trip that covers 240 km and takes 4 hours to make.

5.      Acceleration is defined as the CHANGE in

6.      Suppose you are in a car that is going around a curve. The speedometer

reads a constant 30 miles per hour. Which of the following is NOT true?

7.      Suppose a car is moving in a straight line and steadily increases its

speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h

to 45 km/h the next second. What is the car's acceleration?

8.      When something falls to the ground, it accelerates. This acceleration is

called the acceleration due to gravity and is symbolized by the letter g.

What is the value of g on the earth's surface?

9.      A ball is thrown straight up. At the top of its path its instantaneous

speed is

10.     A ball is thrown straight up. At the top of its path its acceleration is

11.     An object travels 8 meters in the first second of travel, 8 meters

again during the second second of travel, and 8 meters again during the

third second. Its acceleration is

12.     Ten seconds after starting from rest, a car is moving at 40 m/s. What

is the car's average acceleration?

13.     A car accelerates at 2 m/s/s. Assuming the car starts from rest, how

much time does it need to accelerate to a speed of 30 m/s?

14.     As an object falls freely in a vacuum, its

15.     If a freely falling object were somehow equipped with a speedometer,

its speed reading would increase each second by

16.     If an object were equipped with a speedometer and allowed to fall

freely on a planet where the acceleration due to gravity is 20 m/s/s, the

reading on the speedometer increases each second by

17.     In the absence of air resistance, objects fall at constant

18.     A ball is thrown upwards and caught when it comes back down. In the

absence of air resistance, the speed of the ball when caught would be

19.     Ten seconds after starting from rest, a freely falling object will have

20.     One-half second after starting from rest, a freely falling object will

21.     Suppose an object is in free fall. Each second the object falls

22.     If you drop a feather and a coin at the same time in a vacuum tube,

which will reach the bottom of the tube first?

23.     If you drop a feather and a coin at the same time in a tube filled with

air, which will reach the bottom of the tube first?

24.     If a projectile is fired straight up at a speed of 10 m/s, the total

25.     Consider drops of water leaking from a water faucet. As the drops fall they

26.     A ball tossed vertically upward rises, reaches its highest point, and

then falls back to its starting point. During this time the acceleration of

the ball is always

27.     The hang time (time one's feet are off the ground in a jump) for most

athletes is

28.     The vertical height attained by a basketball player who achieves a hang

time of a full 1 second is about

29.     Suppose a jumper claims a hang time of 2 seconds. Then that jumper must

be able to jump a vertical distance of

30.     When a basketball player jumps to make a shot, once the feet are off

the floor, the jumper's acceleration

31.     A vector is a quantity that has

32.     A scalar is a quantity that has

33.     When representing velocity as a vector

34.     Suppose a small plane can fly at 200 km/h relative to the surrounding

air. Suppose also that there is a 40-km/h tailwind. How fast does the

plane's shadow move across the ground?

35.     In order to find the components of a vector, you should

36.     Which of the following would NOT be considered a projectile?

37.     The horizontal component of a projectile's velocity is independent of

A) the vertical component of its velocity.

B) the range of the projectile.

C) time.

38.     In the absence of air friction, the vertical component of a

projectile's velocity doesn't change as the projectile moves.

39.     In the absence of air friction, the horizontal component of a

projectile's velocity doesn't change as the projectile moves.

40.     At the instant a ball is thrown horizontally with a large force, an

identical ball is dropped from the same height Which ball hits the ground

first?

41.     A cannonball is fired at some angle into the air. In the first second

it moves 10 meters horizontally. Assuming it doesn't hit the ground and air

resistance is small, how far does it move horizontally in the next second?

42.     A ball is thrown into the air at some angle. At the very top of the

ball's path, its velocity is

43.     In the absence of air resistance, the angle at which a thrown ball will

go the farthest is

44.     A ball thrown in the air will never go as far as physics ideally would

predict because

45.     At what part of a path does a projectile have minimum speed?

46.     A ball is thrown straight upward at 20 m/s. Ideally (no air

resistance), the ball will return to the thrower's hand with a speed of

47.     A cannonball is launched from the ground at an angle of 30 degrees and

a speed of 20 m/s. Ideally (no air resistance) the ball will land on the

ground with a speed of

48.     A bullet fired horizontally hits the ground in 0.5 seconds. If it had

been fired with a much higher speed in the same direction, it would have

hit the ground (neglecting the earth's curvature and air resistance) in

49.     A projectile is fired horizontally in a vacuum. The projectile

maintains its horizontal component of speed because it

50.     An object is dropped and falls freely to the ground with an

acceleration of 1 g. If it is thrown upward at an angle instead, its

acceleration would be

51.     A ball is hurled into the air at an angle of 30 degrees and lands on a

target that is at the same level as that where the ball started. The ball

will also land on the target if it is thrown at an angle of

52.     A rifle with a muzzle velocity of 100 m/s is fired horizontally from a

tower. Neglecting air resistance, where will the bullet be 1 second later?

53.     After a rock that is thrown straight up reaches the top of its path and

is starting to fall back down, its acceleration is (neglect air resistance)

54.     An airplane flying into a head wind loses ground speed, and an airplane

flying with the wind gains ground speed. If an airplane flies at right

angles to the wind, then ground speed is

55.     Jose can jump vertically 1 meter from his skateboard when it is at

rest. When the skateboard is moving horizontally, Jose can jump

56.     Which best approximates the resultant of a pair of 10-unit vectors at

right angles to each other?

57.     What is the resultant of a 4-unit vector and 3-unit vector at right

angles to each other?

58.     When in orbit, a satellite like the Space Shuttle is

59.     In Chapter 2 we learned about "hang time", the time a jumper's feet are

off the ground in a vertical jump. If the jumper runs horizontally and has

the same vertical component of takeoff velocity, hang time will be

60.     If you could throw a baseball horizontally at a speed of 8 km/s and if

there is no air drag and nothing to stop it

61.     The astronomer Copernicus was the first person to publicly state that

the earth

62.     Galileo found that a ball rolling down one inclined plane would roll

how far up another inclined plane?

63.     The law of inertia states that an object

64.     The law of inertia applies to

65.     After a cannon ball is fired into frictionless space, the amount of

force needed to keep it going equals

66.     Which has more mass, a kilogram of feathers or a kilogram of iron?

67.     If the force of gravity suddenly stopped acting on the planets, they would

68.     A sheet of paper can be withdrawn from under a container of milk

without toppling it if the paper is jerked quickly. The reason this can be

done is that

69.     One object has twice as much mass as another object. The first object

also has twice as much

70.     Compared to its weight on earth, a 10-kg object on the moon will weigh

71.     Compared to its mass on earth, the mass of a 10-kg object on the moon is

72.     How much does a 1 kg bag of nails weigh?

73.     Strange as it may seem, it is just as hard to push a car on the moon as it is to push the same car on earth. This is because

74.     A certain bag of groceries has a mass of 10 kilograms and a weight of about

75.     The mass of a dog that weighs 100 N is about

76.     The force required to maintain an object at a constant speed in free

space is equal to

77.     An object following a straight-line path at constant speed

78.     Friction

79.     A 10-N force and a 30-N force act in the same direction on an object.

What is the net force on the object?

80.     A 10-N force and a 30-N force act on an object in opposite directions.

What is the net force on the object?

81.     You would have the largest mass of gold if your chunk of gold weighed 1

N on the

82.     An object weighs 30 N on earth. A second object weighs 30 N on the

moon. Which has the greater mass?

83.     Equilibrium occurs when

84.     What would be the safest way to put up a clothesline so it does not

break when wet clothes are hung upon it?

85.     When a woman stands with two feet on a scale, the scale reads 500 N.

When she lifts one foot, the scale reads

86.     Friction is a force that always acts

87.     A barge is being pulled by two ropes that make equal angles with the

direction in which the barge is traveling. Assuming the two pulls on the

barge are equal, in what direction does the barge move?

88.     What is the minimum resultant possible when adding a 3-N force to an

8-N force?

89.     What is the maximum resultant possible when adding a 3-N force to an

8-N force?

90.     The weight of a person can be represented by a vector that acts

91.     If you hang from two strands of a vertical clothesline, the tension in

each line will be half your weight. If the lines are not vertical, but are

at equal angles from the vertical, the tension in each

92.     A 100-N lantern is suspended by a pair of ropes with 120 degrees

between them (each 60 degrees from the vertical). The tension in each rope

is

93.     Accelerations are produced by

94.     How does acceleration of an object change in relation to its mass? It is

95.     The acceleration produced by a net force on an object is

96.     If the force acting on a cart doubles, what happens to the cart's

acceleration?

97.     Suppose a cart is being moved by a force. If suddenly a load is dumped

into the cart so that the cart's mass doubles, what happens to the cart's

acceleration?

98.     How much force is needed to accelerate a 2 kg physics book to an

acceleration of 6 m/s/s?

99.     A girl whose weight is 200 N hangs from a bar supported by two strands

of rope. What is the tension in each strand?

100.    A jumbo jet cruises at a constant velocity when the total thrust of

the engines on the jet is 40000 N. How much air resistance acts on the jet?

101.    When an object reaches terminal velocity its acceleration is

102.    A heavy person and a light person parachute together and wear the same

size parachutes. Assuming they open their parachutes at the same time,

which person reaches the ground first?

103.    A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of

gravity on the 10-kg brick is

104.    Compared to its weight on earth, a 10-kg object on the moon will weigh

105.    Suppose the force of friction on a sliding object is 10 N. The force

needed to maintain a constant velocity is

106.    A 10-N falling object encounters 4 N of air resistance. The magnitude

of the net force on the object is

107.    A 10-N falling object encounters 10 N of air resistance. The magnitude

of the net force on the object is

108.    An apple weighs 1 N. When held at rest above your head, the net force

on the apple is

109.    An apple weighs 1 N. The net force on the apple when it is in free fall is

110.    A car has a mass of 1000 kg and accelerates at 2 meters per second per

second. What is the magnitude of the force acting on the car?

111.    A tow truck exerts a force of 3000 N on a car, accelerating it at 2

m/s/s. What is the mass of the car?

112.    A girl pulls on a 10-kg wagon with a constant force of 30 N. What is

the wagon's acceleration?

113.    An object has a constant mass. A constant force on the object produces

constant

114.    A force of 100 N accelerates a mass of 1 kg at the rate of 1 meter per second squared. The acceleration of a mass of 2 kg acted upon by a force of 2 N is

115.    A push on a 1-kilogram brick accelerates the brick. Neglecting

friction, to equally accelerate a 10 kilogram brick, one would have to push

116.    A rock is thrown vertically into the air. At the very top of its

trajectory the net force on it is

117.    A block is dragged without acceleration in a straight-line path across

a level surface by a force of 6 N. What is the frictional force between the

block and the surface?

118.    Suppose a particle is accelerated through space by a constant 10-N

force. Suddenly the particle encounters a second force of 10-N in a

direction opposite to that of the first force. The particle

119.    A 747 jumbo jet has a mass of 30000 kg. The thrust for each of four

engines is 15000 N. What is the jet's acceleration when taking off?

120.    Pressure is defined as

121.    The unit of pressure is

122.    Which of the following would exert the most pressure on the ground?

123.    A tennis ball and a solid steel ball the same size are dropped at the

same time. Which ball has the greater force acting on it?

124.    A tennis ball and a solid steel ball the same size are dropped at the

same time. In the absence of air resistance, which ball has the greater

acceleration?

125.    The reason a tennis ball and a solid steel ball will accelerate at the

same rate, in the absence of air resistance, is that

126.    The terminal speed for a person parachuting (with the chute open) is about

127.    Aunt Minnie throws a rock downward, and air resistance is negligible.

The acceleration of the rock after leaving the hand compared to being

dropped is

128.    As Bob falls from a high-flying stationary helicopter, his velocity

increases and his acceleration

129.    If you pull horizontally on a crate with a force of 150 N and the

crate doesn't move, the friction force must be 150 N. Now if you pull with

250 N so the crate slides at constant velocity, the friction force is

130.    You pull horizontally on a 50-kg crate with a force of 500 N, and the

friction force on the crate is 250 N. The acceleration of the crate is

131.    When the angle of an incline with a block resting on it increases, the

normal  force acting on the block

132.    A block is at rest on an incline. The force of friction that prevents

the block from sliding increases when the incline angle is

133.    Consider a ball rolling down the  decreasing slope inside of a

semicircular bowl (the slope is steep at the top rim, gets less steep

toward the bottom, and is zero (no slope) at the bottom). As the ball rolls

from the rim downward toward the bottom, it gains speed and its

acceleration

134.    A speeding truck slams it brakes and it skids to a stop. If the

truck's  total mass were doubled, its skidding distance would be

135.    Whenever an object exerts a force on another object, the second object

exerts a force of the same magnitude, but in the opposite direction to that

of the first object.

136.    A high school student hits a nail with a hammer. During the collision,

there is a force

137.    A woman weighing 500 N sits on the floor. She exerts a force on the

floor of

138.    As a 500 N woman sits on the floor, the floor exerts a force on her of

139.    Forces always occur

140.    An archer shoots an arrow. Consider the action force to be the bow

string against the arrow. The reaction to this force is the

141.    A player catches a ball. Consider the action force to be the impact of

the ball against the player's glove. What is the reaction to this force?

142.    A player hits a ball with a bat. The action force is the impact of the

bat against the ball. What is the reaction to this force?

143.    As a ball falls, the action force is the pull of the earth's mass on

the ball. What is the reaction to this force?

144.    A person is attracted towards the center of the earth by a 500-N

gravitational force. The force with which the earth is attracted toward the

person is

145.    An unfortunate bug splatters against the windshield of a moving car.

Compared to the force of the car on the bug, the force of the bug on the

car is

146.    An unfortunate bug splatters against the windshield of a moving car.

Compared to the deceleration of the car, the deceleration of the bug is

147.    If a horse pulls on a wagon at rest, the wagon pulls back equally as

much on the horse. Will the wagon be set into motion?

148.    A Mack truck and a Volkswagen traveling at the same speed have a

head-on collision. The vehicle to undergo the greater change in velocity

will be the

149.    Two people pull on a rope in a tug-of-war. Each pulls with 400 N of

force. What is the tension in the rope?

150.    According to Newton's third law, if you push gently on something, it

will push

151.    The earth pulls on the moon, and similarly the moon pulls on the

earth. This is evidence that the

152.    Nellie Newton holds an apple in her hand. If action is the earth

pulling on the apple, then reaction is

153.    Bronco the skydiver falls toward the earth. The attraction of the

earth on Bronco pulls him down. The reaction to this force is

154.    A force is exerted on the tires of a car to accelerate the car along

the road. The force is exerted by the

155.    A rocket is able to accelerate in the vacuum of space when it fires

its engines. The force that propels the rocket is the force

156.    Two people, one having twice the mass of the other, play tug-of-war

with a 12 meter rope on frictionless ice. After a brief time, they meet.

The heavier person slides a distance of

157.    A karate chop delivers a blow of 3000 N to a board that breaks. The

force that acts on the hand during this feat

158.    Your friend says that the heavyweight champion of the world cannot

exert a force of 50 N on a piece of tissue paper with his best punch. The

tissue paper is held in midair, no wall, no tricks.

159.    The momentum of an object is defined as the object's

160.    Which has more momentum, a large truck moving at 30 miles per hour or

a small truck moving at 30 miles per hour?

161.    Compared to a sports car moving at 30 miles per hour, the same sports

car moving at 60 miles per hour has

162.    If the momentum of an object changes and its mass remains constant,

163.    The momentum change of an object is equal to the

164.    In order to increase the final momentum of a golf ball, we could

165.    The reason padded dashboards are used in cars is that they

166.    A Ping-Pong® ball gun is fired. Compared to the force on the ball, the

force on the gun is

167.    A Ping-Pong gun is fired. Compared to the impulse on the ball, the

impulse on the gun is

168.    Momentum of a system is conserved only when

169.    A collision is considered elastic if

170.    Suppose a girl is standing on a pond where there is no friction

between her feet and the ice. In order to get off the ice, she must

171.    Which of the following has the largest momentum?

172.    A freight train rolls along a track with considerable momentum. If it

were to roll at the same speed but had twice as much mass, its momentum

would be

173.    A rifle recoils from firing a bullet. The speed of the rifle's recoil

is small because the

174.    Suppose a gun is made of a strong but very light material. Suppose

also that the bullet is more massive than the gun itself. For such a weapon

175.    Two objects, A and B, have the same size and shape, but A is twice as

heavy as B. When they are dropped simultaneously from a tower, they reach

the ground at the same time, but A has a higher

176.    In order to catch a ball, a baseball player moves his or her hand

backward in the direction of the ball's motion. Doing this reduces the

force of impact on the player's hand principally because

177.    A car traveling along the highway needs a certain amount of force

exerted on it to stop. More stopping force may be required when the car has

178.    A gun fires a bullet. The speed of the bullet will be the same as the

speed of the recoiling gun

179.    The force of an apple hitting the ground depends upon

180.    When you jump off a step, you usually bend your knees as you reach the

ground. By doing this, the time of the impact is about 10 times more what

it would be in a stiff-legged landing and the average force on your body is

reduced by

181.    A 2-kg ball is thrown at 3 m/s. What is the ball's momentum?

182.    A 4-kg ball has a momentum of 12 kg-m/s. What is the ball's speed?

183.    A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the

ball's mass?

184.    Recoil is noticeable if we throw a heavy ball while standing on roller

skates. If instead we go through the motions of throwing the ball but hold

onto it, our net recoil velocity will be

185.    A 1-N apple falls to the ground. The apple hits the ground with an

186.    A karate expert executes a swift blow and severs a cement block with

her bare hand.

187.    A moving freight car runs into an identical car at rest on the track.

The cars couple together. Compared to the velocity of the first car before

the collision, the velocity of the combined cars after the collision is

188.    Two gliders having the same mass and speeds move toward each other on

an air track and stick together. After the collision the velocity of the

gliders is

189.    A piece of putty moving with 1 unit of momentum strikes and sticks to

a heavy bowling ball that is initially at rest. After the putty sticks to

the ball, both are set in motion with a combined momentum that is

190.    A 1-kg chunk of putty moving at a 1 m/s collides with and sticks to a

5-kg bowling ball that is initially at rest. The bowling ball with its

putty host will then be set in motion with a momentum of

191.    The force that accelerates a rocket into outer space is exerted on the

rocket by the

192.    If all people, animals, trains and trucks all over the world began to

walk or run towards the east, then

193.    Suppose an astronaut in outer space wishes to play a solitary "throw,

bounce, and catch" game by tossing a ball against a very massive and

perfectly elastic concrete wall. If the ball is as massive as the

astronaut, then

194.    A golf ball moving forward with 1 unit of momentum strikes and bounces

backward off a heavy bowling ball that is initially at rest and free to

move. The bowling ball is set in motion with a momentum of

195.    Superman is at rest in space when he throws an asteroid that has more

mass than he does. Which moves faster, Superman or the asteroid?

196.    A cannonball shot from a long-barrel cannon travels faster than one

shot from a short-barrel cannon because the cannonball receives a greater

197.    While rollerblading, Granny collides with her tiny grandson Ambrose

who is at rest. Ignoring any friction effects, Ambrose's speed after the

collision will be greatest when

198.    A small economy car (low mass) and a limousine (high mass) are pushed

from rest across a parking lot, equal distances with equal forces. The car

that receives the greater impulse is the

199.    In physics, work is defined as

200.    If you lift two loads up one story, how much work do you do compared

to lifting just one load up one story?

201.    If you lift one load up two stories, how much work do you do compared

to lifting one load up only one story?

202.    If Nellie Newton pushes an object with twice the force for twice the

distance, she does

203.    How many joules of work are done on an object when a force of 10 N

pushes it 5 m?

204.    The unit of work is the

205.    Power is defined as the

206.    How much power is required to do 100 J of work on an object in 2 seconds?

207.    The unit of power is the

208.    Potential energy is the energy an object has because of its

209.    The amount of potential energy possessed by an elevated object is equal to

210.    How much work is done on a 50-N rock that you carry horizontally

across a 10 m room?

211.    How much work is done on a 50-N rock that you lift 10 m?

212.    How much power is expended if you lift a 50-N rock 10 meters in 1 second?

213.    Kinetic energy of an object is equal to

214.    How much farther will a car traveling at 100 km/s skid than the same

car traveling at 50 km/s?

215.    Suppose a moving car has 2000 J of kinetic energy. If the car's speed

doubles, how much kinetic energy would it then have?

216.    An arrow in a bow has 70 J of potential energy. Assuming no loss of

energy due to heat, how much kinetic energy will it have after it has beens

hot?

217.    Energy is changed from one form to another with no net loss or gain.

218.    As a pendulum swings back and forth

219.    An object that has linear kinetic energy must be

220.    Bullets are fired from an airplane in the forward direction of motion.

The momentum of the airplane will be

221.    A woman can lift barrels a vertical distance of 1 meter or can roll

them up a 2 meter-long ramp to the same elevation. If she uses the ramp,

the applied force required is

222.    A job is done slowly, and an identical job is done quickly. Both jobs

require the same amount of work but different amounts of

223.    Which requires more work: lifting a 50-kg sack vertically 2 meters or

lifting a 25-kg sack vertically 4 meters?

224.    It takes 40 J to push a large box 4 m across a floor. Assuming the

push is in the same direction as the move, what is the magnitude of the

force on the box?

225.    A ball is thrown into the air with 100 J of kinetic energy which is

transformed to gravitational potential energy at the top of its trajectory.

When it returns to its original level after encountering air resistance,

its kinetic energy is

226.    An object that has kinetic energy must be

227.    An object that has kinetic energy must have

228.    If Kelly the skater's speed increases so he has twice the momentum,

then his kinetic energy increases by

229.    Which has greater kinetic energy, a car traveling at 30 km/h or a

half-as-massive car traveling at 60 km/h?

230.    A person on a roof throws one ball downward and an identical ball

upward at the same speed. The ball thrown downward hits the ground with 100

J of kinetic energy. Ignoring air friction, with how much kinetic energy

does the second ball hit the ground?

231.    A 10-N object moves at 1 m/s.  Its kinetic energy is

232.    An object at rest may have

233.    A heavy object and a light object are released from rest at the same

height and time in a vacuum. As they fall, they have equal

234.    If an object has kinetic energy, then it also must have

235.    If the velocity of a moving object doubles, then what else doubles?

236.    All simple machines ideally work on the principle that

237.    The ratio of output force to input force of a simple machine is called the

238.    A girl can easily lift an 80-N rock with the help of a lever. When she

pushes down with 10 N of force, she lifts the rock 0.1 meters. How far does

she move her arms to do this?

239.    A pulley system can

240.    A pulley has two supporting strands. In order to use it to lift a load

1 meter, the person pulling will have to pull a distance of

241.    The ratio of useful work output to total work input is called the

242.    A frictionless inclined plane is 6 m long and rests on a wall that is

2 m high. How much force is needed to push a block of ice weighing 300 N up

the plane?

243.    A certain jack has a theoretical mechanical advantage of 500. However,

due to frictional forces, the actual mechanical advantage is only 100. What

is the efficiency of the jack?

244.    About how efficient is a typical gasoline-burning car engine?

245.    A machine puts out 100 watts of power for every 1000 watts put into

it. The efficiency of the machine is

246.    A small economy car (low mass) and a limousine (high mass) are pushed

from rest across a parking lot, equal distances with equal forces. The car

that receives more change in kinetic energy is the

247.    A popular swinging apparatus consists of an aligned row of identical

elastic balls suspended by strings so they touch each other. When two balls

on one end are elevated and released, they slam into the array of balls and

two balls pop out the other side. If instead, one ball popped out with

twice the speed, this would be a violation of the conservation of

248.    Consider molecules of hydrogen gas and molecules of heavier oxygen gas

that have the same kinetic energy. The molecules with more speed are

249.    Which has greater linear speed, a horse near the outside rail of a

merry-go- round or a horse near the inside rail?

250.    Which has greater angular speed, a horse near the outside rail of a

merry-go-round or a horse near the inside rail?

251.    Which of the following is NOT a unit of rotational speed?

252.    What is the direction of the force that acts on clothes in the spin

cycle of a washing machine?

253.    A tin can whirled on the end of a string moves in a circle because

254.    If you whirl a tin can on the end of a string and the string suddenly

breaks, the can will

255.    A ladybug rests on the bottom of a tin can that is being whirled

horizontally on the end of a string. Since the ladybug, like the can, moves

in a circle, there must be a force on it. What exerts this force?

256.    People in the future may well live inside a rotating space structure

that is more than 2 km in diameter. Inside the structure, people on the

inside of the outer edge will experience 1 g while people halfway to the

axis will experience

257.    "Centrifugal forces" are an apparent reality to observers in a

reference frame that is

258.    A person weighs less at the equator than at the poles. The reason for

this has to do with the

259.    As the rotational speed of a space habitat increases, the weight of

people inside

260.    A car travels in a circle with constant speed. The net force on the car

261.    If the earth rotated more slowly about its axis, your weight would

262.    To weigh less in the Northern Hemisphere, you should go

263.    A possible space habitat of the future is a cylinder in space rotating

about its long axis. What is the relative gravitational field along the

axis of the habitat?

264.    A space habitat is designed so that the variation in g between a

person's head and feet is less than 0.01 g. If the person is 2 m tall, then

the radius of the habitat is

265.    A swimming area in a rotating space habitat is located in a

one-fourth-g region. If a diver can jump 1 m high in a 1-g region, how high

can the same diver jump in the swimming area?

266.    When a railroad train rounds a banked track, the centripetal force

needed comes not from friction, but from the

267.    The centripetal force exerted on stunt motorcyclist Biker Bob while

riding on the inner vertical surface of a circular track is

268.    Nellie Newton swings a rock into a circular path while holding an

attached string overhead. The string makes a 45 degree angle to the

vertical (comprising a "conical pendulum").  The centripetal force that

holds the rock in its circular path is the

269.    Stunt motorcyclist Biker Bob rides his bike inside a futuristic

rotating space station-a giant rotating donut-shaped structure in space.

The normal support force feels like weight to him. As he rides his bike in

the same direction that the station rotates, the normal force

270.    Stunt motorcyclist Biker Bob rides his bike inside a futuristic

rotating space station-a giant rotating donut-shaped structure in space.

The normal support force feels like weight to him. As he rides his bike in

the opposite direction that the station rotates, the normal force

271.    Suzie Spacewalker hovers in space beside a rotating space station in

outer space. Both she and the center of mass of the space station are at

relative rest. If the space station is in earth orbit, then Suzie is

272.    Where is the center of gravity of a softball bat located?

273.    When a wrench is slid spinning over a frictionless tabletop, its

center of gravity follows

274.    The center of gravity of an object can be located by

275.    In which of the following is the center of gravity located at a point

where there is no mass?

276.    An object will fall over if its center of gravity is

277.    When you carry a heavy load with one arm, why do you tend to hold your

free arm away from your body?

278.    If an object is in unstable equilibrium, any displacement will

279.    If an object is in stable equilibrium, any displacement will

280.    If an object is in neutral equilibrium, any displacement will

281.    If you try to touch your toes while standing flat against a wall, you

probably will fall over. The reason this happens is that

282.    The center of mass of the solar system

283.    The long heavy tail of a spider monkey enables the monkey to easily

vary its

284.    The center of mass of a human body is located at a point

285.    An object thrown into the air rotates about its

286.    If a plumb line is dropped from a suspension point of a rectangular

sheet of plywood

287.    A fish suspended in water is in what kind of equilibrium?

288.    A ball resting on the floor is in what kind of equilibrium?

289.    A picture hangs on a wall by a wire that is passed over a supporting

nail. The picture is in stable equilibrium because

290.    Based on stability concepts, you would expect a very broad tree to have

291.    You push a table tennis ball beneath the surface of water in a glass

of water. The center of gravity of the glass of water

292.    Torque is defined as

293.    Suppose you try loosening a nut with a wrench, and the nut doesn't

give at all. You increase your chance of success if you

294.    A meter stick is balanced at the 50-cm mark. You tie a 20-N weight at

the 30-cm mark. Where should a 30-N weight be placed so the meter stick

will again be balanced?

295.    If a football is kicked so the force on the ball is through its center

of gravity, the ball will

296.    The resistance an object has to changes in its rotational state of

motion is called rotational

297.    Which has more rotational inertia, a bicycle wheel or a solid disk of

the same mass and diameter?

298.    Which has more rotational inertia, a girl running with her legs bent

or the same girl running with her legs straight?

299.    Which objects roll down an incline with the greatest acceleration?

300.    Any solid cylinder will roll down an incline with greater acceleration

than any hollow cylinder if the

301.    A person's rotational inertia is least about

302.    When a gymnast moves from an extended position to a tucked position, she

303.    Angular momentum is defined as

304.    A 2-kg ball is whirled on the end of a string that is 3 m long. The

ball's linear speed is 2 m/s. What is its angular momentum?

305.    An object will maintain its angular momentum unless acted on by an

unbalanced force.

306.    The reason an ice skater turns faster when he pulls his hands in is that

307.    If the planet Jupiter underwent gravitational collapse, its rate of

308.    Suppose a huge rotating cloud of particles in space gravitates

together to form a dense ball. As the cloud shrinks in size it rotates

309.    Two the seesaw, that person's end of the seesaw will

310.    To turn a stubborn screw, it is best to use a screwdriver that has a

311.    Suppose a carnival Ferris wheel has seats that are located halfway

between the center and the outside rim. Compared to the ordinary Ferris

wheel, where the seats are on the outside rim, your angular speed on this

Ferris wheel would be

312.    Which reaches the bottom of a hill sooner, an empty car fire or the

same tire mounted on a rim?

313.    A ring and a disk roll down a hill together. Which reaches the bottom

first?

314.    A ring, a disk, and a solid ball having equal masses roll down a hill

at the same time. Which reaches the bottom first?

315.    A good explanation of why a ball gains speed as it rolls down an

incline involves the

316.    At the health spa, Felix Flex finds that pulleys on the exercise

machines are not circular, but are "cams"-sort of oval shaped. At different

orientations, the cams provide different

317.    A common thread spool rests on a flat table. You gently pull in a

horizontal direction on a short piece of thread attached to (wrapped

around) the spool.  The spool will roll toward you

318.    A common thread spool rests on a flat table. You gently pull at an

angle on a short piece of thread attached to (wrapped around) the spool

that causes the spool to slide without rotating. With the thread at this

angle, the lever arm is

319.    Why did Newton think there was a force acting on the moon?

320.    Newton had the insight to see that the

321.    Newton hypothesized that the moon

322.    Newton reasoned that the gravitational attraction between the earth

and the moon must be

323.    Since the earth is attracted to the sun, why doesn't it fall into the sun?

324.    The gravitational force between two masses

325.    If the mass of the earth increased, with no change in radius, your

weight would

326.    If the radius of the earth decreased, with no change in mass, your weight would

327.    If the earth's mass decreased to one half its original mass, with no

328.    According to Newton's laws, a rock and a pebble will fall at the same

acceleration in a gravitational field because

329.    A 400-N woman stands on top of a very tall ladder so she is one earth

radius above the earth's surface. How much does she weigh?

330.    A very massive object A and a less massive object B move toward each

other under the influence of mutual gravitation. Which force, if either, is

greater?

331.    Two objects move toward each other because of gravitational

attraction. As the objects get closer and closer, the force between them

332.    Suppose the gravitational force between two masses is 10 N. If the

volume of each mass doubles, while everything else stays the same, what is

the force between the masses?

333.    Gravitational forces are the weakest forces found in nature.  Because

of this

334.    Suppose the gravitational force between two massive spheres is 10 N.

If the distance between the spheres is cut in half, what is the force

between the masses?

335.    Suppose the gravitational force between two massive spheres is 10 N.

If the distance between the spheres is doubled, what is the force between

the masses?

336.    Suppose the gravitational force between two massive spheres is 10 N.

If the magnitude of each mass doubles, what is the force between the

masses?

337.    By noticing that Uranus's orbit is perturbed and by using the law of

gravitation, two astronomers independently discovered

338.    The force of gravity acting on you will increase if you

339.    The force of gravity on you is greatest when you are standing

340.    The reason the moon does not fall into the earth is that the

341.    A lunar month is about 28 days. If the moon were closer to the earth

than it is now, the lunar month would be

342.    A hollow spherical planet is inhabited by people who live inside it,

where the gravitational field is zero. When a very massive space ship lands

on the planets surface, the gravitational field inside the planet is

343.    A supplier wants to make a profit by buying metal by weight at one

altitude and selling it at the same price per pound at another altitude.

The supplier should

344.    Each of us weighs a tiny bit less on the ground floor of a skyscraper

than we do on the top floor. One reason for this is that

345.    Compare the gravitational force between Earth and Mars, and the

gravitational force between a new-born baby and the doctor who holds it.

The greater force is between

346.    Consider the gravitational force between the earth and a meteor in

outer space. If the meteor moves so its distance from the earth's center

doubles, the gravitational force on the meteor will be

347.    Consider the gravitational force between the earth and a meteor in

outer space. If the meteor moves so its distance to the earth's center is

half of what is was before, the gravitational force on the meteor will be

348.    Which is more, the gravitational force between the earth and the moon,

or between the earth and the sun?

349.    Jupiter has more than 300 times the mass of the earth. Yet on

Jupiter's surface an object weighs only about 3 times as much as it would

on the earth. The explanation to this involves Jupiter's

350.    If you stood atop a ladder on earth that was as tall as the earth's

radius (so you were twice as far from earth's center) your weight atop the

351.    The source of all wave motion is a

352.    The time needed for a wave to make one complete cycle is its

353.    The distance between successive identical parts of a wave is called its

354.    Hertz is a

355.    A wave created by shaking a rope up and down is called a

356.    Which of the following is NOT a transverse wave?

357.    Sound is an example of a

358.    Unlike a transverse wave, a longitudinal wave has no

359.    When two or more waves are at the same place at the same time, the

resulting effect is called

360.    Two waves arrive at the same place at the same time exactly in step

with each other. Each wave has an amplitude of 1 m. The resulting wave has

an amplitude of

361.    Where can you touch a standing wave on a rope without disturbing the wave?

362.    Standing waves can be set up

363.    Suppose a bug is jiggling up and down and swimming towards you at the

same time. Compared to the frequency at which the bug is emitting waves,

the frequency of the waves reaching at you is

364.    As the sound of a car's horn passes and recedes from you, the pitch of

the horn seems to

365.    The Doppler effect is the change in observed frequency due to

366.    When a sound source moves towards you, what happens to the wave speed?

367.    Some of a wave's energy is always being dissipated as heat. In time,

this will reduce the wave's

368.    The amplitude of a particular wave is 1 meter. The top-to-bottom

distance of the disturbance is

369.    When a pendulum clock is taken from sea level to the top of a high

mountain, it will

370.    If you double the frequency of a vibrating object, its period

371.    You dip your finger repeatedly into water and make waves. If you dip

your finger more frequently, the wavelength of the waves

372.    During a single period, the distance traveled by a wave is

373.    A child swings back and forth on a playground swing. If the child

stands rather than sits, the time for a to-and-fro swing is

374.    Suppose a simple pendulum is suspended in an elevator. When the

elevator is accelerating upward, the period of the pendulum

375.    A horse would be able to run faster if most of the mass in its legs

were concentrated

376.    What happens when an airplane is flying faster than the speed of sound?

377.    A sonic boom

378.    An observer on the ground hears a sonic boom which is created by an

airplane flying at a speed

379.    An aircraft that flies faster than the speed of sound is said to be

380.    A Doppler effect occurs when a source of sound moves

381.    The sonic boom produced by an aircraft flying near the ground will be

reduced if the aircraft

382.    The period of an ocean wave is 10 seconds. What is the wave's frequency?

383.    A certain ocean wave has a frequency of 0.05 hertz and a wavelength of

10 meters. What is the wave's speed?

384.    A weight on the end of a spring bobs up and down one complete cycle

every 2 seconds. Its frequency is

385.    A weight on the end of a spring bobs up and down one complete cycle

every 2 seconds. Its period is

386.    A weight suspended from a spring bobs up and down over a distance of 1

meter in 2 seconds. Its frequency is

387.    A leaf on a pond oscillates up and down two complete cycles each

second as a water wave passes. What is the wave's frequency?

388.    A cork floating in the ocean oscillates up and down two complete

cycles in 1 second as an ocean wave passes by. The wave's wavelength is 10

meters. What is the wave's speed?

389.    A wave travels an average distance of 6 meters in 1 second. What is

the wave's velocity?

390.    The frequency of the second hand on a clock is

391.    A wave has two up and down two cycles each second. If the wave travels

an average distance of 6 meters in 1 second, its wavelength is

392.    Radio waves travels at the speed of light, 300 000 km/s. The

393.    A skipper on a boat notices wave crests passing the anchor chain every

5 seconds. The skipper estimates the distance between crests at 15 m. What

is the speed of the water waves?

394.    Compared to the speed of light, sound travels

395.    Sound waves are produced by

396.    Sound waves in air are a series of

397.    Which of the following would be most likely to transmit sound the best?

398.    A sound wave is a

399.    Sound waves cannot travel in

400.    The speed of a sound wave depends on

401.    Sound travels faster in air if the air is

402.    The speed of sound in dry air at 20 degrees Celsius is 340 m/s. How

far away is a jet plane when you notice a 2-second delay between seeing the

plane and hearing it?

403.    If the sounding board were left out of a music box, it would

404.    Resonance occurs when

405.    A tuning fork of frequency 200 Hz will resonate if a sound wave

incident on it has a frequency of

406.    The singer, Caruso, is said to have made a crystal chandelier shatter with his voice. This is a demonstration of

407.    Sound waves can interfere with one another so that no sound results.

408.    When the handle of a tuning fork is held solidly against a table, the

sound becomes louder and the length of time the fork vibrates

409.    In which one of the following does sound travel the fastest?

410.    The phenomenon of beats results from sound

411.    A 340-Hz sound wave travels at 340 m/s in air, with a wavelength of

412.    Beats are produced when two tuning forks, one of frequency 240 Hz and

the other of frequency 246 Hz, are sounded together. The frequency of the

beats is

413.    Beats can be heard when two tuning forks

414.    How many times a minute will you be in step with a friend when you

walk at 80 steps per minute and your friend walks at 75 steps per minute?

415.    A 1056-Hz tuning fork is sounded at the same time a piano note is

struck. You hear three beats per second. What is the frequency of the piano

string?

416.    An explosion occurs 34 km away. Given that sound travels at 340 m/s,

the time it takes for the sound to reach you is

417.    Xenon has atomic number 54, and krypton has atomic number 36. Given

that both gases are at the same temperature, in which medium does sound

travel fastest?

418.    A general rule for estimating the distance in kilometers between an

observer and a lightning bolt is to count the number of seconds between

seeing and hearing the bolt, and divide by

419.    Two whistles produce sounds of wavelengths 3.4 m and 3.3 m. What is

the beat frequency produced?

420.    Suppose you sound a tuning fork at the same time you hit a 1056-Hz

note on the piano and hear 2 beats/sec. You tighten the piano string very

slightly and now hear 3 beats/sec. What is the frequency of the tuning

fork?

421.    A sound wave that has a wavelength of 1 meter in room-temperature air

422.    An oceanic depth-sounding vessel surveys the ocean bottom with

ultrasonic sound that travels 1530 m/s in seawater, and finds a 6-second

time delay of the echo to the ocean floor and back. The ocean depth there

is

423.    Compared to a sound of 40 decibels, a sound of 60 decibels is

424.    Compared to the threshold of hearing, a sound level of 30 decibels is

425.    Electromagnetic waves are

426.    Electromagnetic waves

427.    Which of these electromagnetic waves has the shortest wavelength?

428.    Compared to the wavelength of ultraviolet waves, the wavelength of

infrared waves is

429.    Compared to the velocity of radio waves, the velocity of visible light

waves is

430.    The source of all electromagnetic waves is

431.    Which of the following is fundamentally different from the others?

432.    The main difference between a radio wave and a light wave is its

433.    The main difference between a radio wave and a sound wave is its

434.    If the sun were to disappear right now, we wouldn't know about it for

8 minutes because it takes 8 minutes

435.    When Roemer took measurements of one of Jupiter's moons (Io) moving

behind Jupiter, he found his predicted time was off. Compared to when the

earth was closest to Io, the predicted times when the earth was farthest

from Io were

436.    Which of the following is NOT an electromagnetic wave?

437.    Heat lamps give off mostly

438.    Compared to air, the speed of light in water is

439.    Glass is transparent to visible light, but not to

440.    The shiny surfaces of metals has most to do with

441.    Clouds

442.    The color that travels fastest through clear glass is

443.    The shadow produced by an object held close to a piece of paper in

sunlight will be

444.    The reason solar eclipses are seen less commonly than lunar eclipses

is that

445.    Light waves are

446.    What is the ultimate source of electromagnetic waves?

447.    A photographer wishes to use a safety light in the darkroom that will

emit low-energy photons. The best color of this light is

448.    Which color light carries the most energy?

449.    How far is a light-second?

450.    When grazing light is reflected from a surface, it is

451.    Light reflected from a lake surface is polarized

452.    If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a

453.    What is the wavelength of an electromagnetic wave that has a 1 Hz

frequency?

454.    What is the frequency of an electromagnetic wave having a wavelength

of 300,000 km?

455.    After randomly polarized light passes through a polarizer, it is

456.    If two Polaroid®filters are held with their polarization axes at right

angles to each other, the amount of light transmitted compared to when

their axes are parallel is

457.    An ideal Polaroid filter will transmit 50% of nonpolarized light

incident on it. How much light is transmitted by two ideal Polaroid filters

that are oriented with their axes parallel to each other?

458.    Because of absorption, a Polaroid will actually transmit 40% of

incident nonpolarized light. Two Polaroid filters with their axes aligned

will transmit

459.    The colors of an object we see around us is determined by the

460.    Sunlight contains all colors of light, but much of it is

461.    The three primary colors of light addition are

462.    When red and green light shine on a white sheet, the resulting color is

463.    When red and blue light shine on a white sheet, the resulting color is

464.    The complementary color of blue is

465.    The earth receives a lot of ultraviolet radiation from the sun.

Luckily most of it doesn't reach the ground, because it is

466.    On the moon, the daytime sky looks

467.    Light shines on a pane of green glass and a pane of clear glass. The

temperature will be higher in

468.    The colored dots that make up the color on a TV screen are

469.    Colors seen on TV result from color

470.    Colors seen on a photograph result from color

471.    A photograph of your favorite person's yellow sweater shows as what

color on the negative?

472.    A tennis ball is more easily seen if its color is

473.    Different colors of light correspond to different light

474.    Complementary colors are two colors that

475.    The complementary color of green is

476.    When blue and yellow paints are mixed together, the result is green.

The reason for this is that

477.    The three paint colors that are useful for color subtraction are

478.    Magenta light is really a mixture of

479.    The color of an opaque object is determined by the light that is

480.    A sheet of red paper will look black when illuminated with

481.    If sunlight were green instead of white, the most comfortable color to

wear on a hot day would be

482.    If molecules in the sky scattered orange light instead of blue light,

sunsets would be colored

483.    If the atmosphere were 50 times thicker than it now is, the sun would

appear

484.    The sky is blue because air molecules in the sky act as tiny

485.    The reason the sky is blue is that air molecules

486.    Sunsets are red because

487.    Clouds are white because water molecules

488.    The true color of water is

489.    The cyan color of ocean water is evidence that the water absorbs

490.    The white caps of waves as they overturn is evidence that the water has

491.    When a sample of an element is heated until it glows, the color it

gives off is

492.    The colors of light emitted by incandescent gases show the

493.    Spectral lines in a line spectrum take the shape of lines because the

494.    If you're looking for an instrument that tells what stars are made of,

look for a

495.    The law of reflection says that

the angle of reflection from a mirror equals the angle of incidence.

496.    When a virtual image is created in a plane mirror

497.    The reason we can read print from any direction is that

498.    An echo occurs when sound

499.    Diffuse reflection occurs when the size of surface irregularities is

500.    It is difficult to see the roadway from a car on a rainy night because

501.    Refraction is the result of

502.    Refraction occurs

503.    You can hear noises a long distance away over water at night because

504.    The average speed of light is greatest in

505.    A penny lies in the bottom of a tea cup filled with water. As you look

down on the penny, compared to its actual depth, it looks

506.    A mirage can occur

507.    When you see a "wet spot" mirage on the road in front of you, you are

most likely seeing

508.    The critical angle for a light from the bottom of a swimming pool

shining upward toward the pool's surface is the angle

509.    A beam of light emerges from water into air at an angle. The beam is bent

510.    When a light beam emerges from water into air, the average light speed

511.    The effect that we call a mirage has most to do with

512.    A person standing waist-deep in a swimming pool appears to be have

short legs because of light

513.    Different colors of light travel at different speeds in a transparent

medium. In a vacuum, different colors of light travel at

514.    The explanation for a filled root beer mug looking fuller than it is

involves

515.    The spectrum produced by a prism or a raindrop is evidence that the

average speed of light in the material depends on the light's

516.    If you walk towards a mirror at a certain speed, the relative speed

between you and your image is

517.    The shortest plane mirror in which you can see your entire image

518.    When you look at yourself in a pocket mirror and then hold the mirror

farther away, you see

519.    A beam of light travels fastest in

520.    Which of the following is a consequence of the refraction of light?

521.    Stars twinkle when seen from the earth at night. When seen from the

moon, stars

522.    The moon's redness during a lunar eclipse results from

523.    In a curved optical fiber, light

524.    A rainbow nicely illustrates an example of light

525.    In a double rainbow, the outermost color in the outermost bow is

526.    A secondary rainbow is dimmer than a primary rainbow because

527.    When seen from an airplane, a rainbow sometimes forms a complete

circle. When this happens, the plane's shadow is

528.    Ninety percent of light incident on a certain piece of glass passes

through it. How much light passes through two pieces of this glass?

529.    A converging lens

530.    An image of a distant object formed by a single converging lens

531.    An image formed by a single diverging lens

532.    A magnifying glass is usually a

533.    Ray diagrams are used to

534.    In drawing a ray diagram, one of the rays can be drawn

535.    If an object is located between the focal point and a converging lens,

the image will be

536.    The reason lines on the bottom of a swimming pool can look wavy when

seen from above is that

537.    If an object is located inside the focal length of a diverging lens,

then compared to the object, the image will be

538.    If an object is located inside the focal length of a converging lens,

the image will be

539.    Suppose you hold a converging lens in front of a window. An image of

some distant hills can be focused on your hand, behind the lens. The focal

point of this lens is located

540.    Suppose you are 2 m in front of a plane mirror and want to take your

picture. For what distance should you set the camera?

541.    All lenses rely on light having a

542.    Which instrument is a human eye most similar to?

543.    A simple astronomical telescope consists of

544.    The objective lens in a compound microscope forms a

545.    The eyepiece of a compound microscope forms a

546.    When slides are put right-side up into a slide projector, the images are

547.    If light traveled at the same speed in glass as it does in air, images

through a telescope would look

549.    On a bright day, the iris of the eye changes so the pupil

550.    If a person's eyes cannot form sharp images at any distance, the person

551.    Sometimes after light passes through a lens, there are tiny bands of

color around the edge of the image. This is due to

552.    The eyes of nearsighted people focus light

553.    Farsighted people need to wear glasses that contain

554.    Spherical aberration occurs when light passes through

555.    Chromatic aberration occurs because different colored light rays

556.    A magnifying glass under water will magnify

557.    The wavy bright and dark lines at the bottom of a swimming pool are

the result of the water surface behaving like moving

558.    If a fish out of water wished to clearly view its surroundings, it

should wear goggles filled with

559.    The charge of an electron is

560.    Atomic nuclei of almost all atoms consist of

561.    Two like charges

562.    Protons and electrons

563.    The fundamental force underlying all chemical reactions is

564.    Electrical forces between charges are normally strongest when the

charges are

565.    Coulomb's law says that the force between any two charges depends

566.    Electrical forces between charges depend on

567.    When the distance between two charges is halved, the electrical force

between the charges

568.    The SI unit of charge is the

569.    The net charge of an nonionized atom

570.    A positive ion has

571.    Conservation of charge means that

572.    Particle A has twice as much charge as particle B. Compared to the

force on particle A, the force on particle B is

573.    If you comb your hair and the comb becomes positively charged, your

hair becomes

574.    To say that electric charge is conserved means that no case has ever

been found where

575.   A difference between electrical forces and gravitational forces is

that electrical forces include

576.    The common hydrogen atom consists of

577.    In a good insulator, electrons are usually

578.    Objects can be charged by

579.    Charge carriers in a metal are electrons rather than protons, because

electrons are

580.    To be safe in the unlikely case of a lightning strike, it is best to

be inside a building framed with

581.    A conductor differs from an insulator in that a conductor has

582.    Much electronic equipment contains transistors and diodes that in turn

583.    A negatively charged rod is brought near a metal can that rests on a

wood table. You touch the opposite side of the can momentarily with your

finger. The can is then

584.    An electroscope is charged positively, as shown by foil leaves that

stand apart. As a negative charge is brought close to the electroscope, the

leaves

585.    Lightning bolts occur between

586.    To charge an object by induction, the process of grounding

587.    When a charged cloud passes overhead, the ground below is charged by

588.    Bring a charged object near a conductor and then momentarily touch the

conductor. This demonstrates charge by

589.    A rubbed balloon will stick to a wooden wall, which demonstrates charge

590.    Electrical polarization occurs when

591.    The reason a charged balloon will stick to a wall is that

592.    The charge distribution in some molecules is permanently separated in

two regions. Such molecules are called

593.    The electrostatic force between two charges located 2 meters apart is

0.10 N. What will the force be between these charges when they are located

1 meter apart?

594.    A 2-C charge and a 4-C charge attract each other with 10 N of force.

How much will a 2-C charge and an 8-N charge attract each other when placed

the same distance apart?

595.    Two charges separated a distance of 1 meter exert a 1-N force on each

other. If the charges are pushed to a separation of 1/4 meter, the force on

each charge will be

596.    Two charges separated a distance of 1 meter exert a 1-N force on each

other. If the charges are pulled to a 2-m separation distance, the force on

each charge will be

597.    Two charges separated a distance of 1 meter exert a 1-N force on each

other. If the magnitude of each charge is doubled, the force on each charge

is

598.    Two charged particles held close to each other are released. As they

move, the force on each particle increases. Therefore, the particles have

599.    Two charged particles held close to each other are released. As the

particles move, the velocity of each increases. Therefore, the particles

have

600.    A positive charge and a negative charge held near each other are

released. As they move, the force on each particle

601.    Two charged particles held near each other are released. As they move,

the acceleration of each decreases. Therefore, the particles have

602.    How many different kinds of force would act on a proton placed in both

an electric field and a gravitational field?

603.    In order to form an electric circuit, you need to have

604.    In order for current to exist in a circuit, you must have

605.    In an alternating current circuit, electron flow is

606.    A closed circuit is a circuit in which charge

607.    When two light bulbs are connected in series, the

608.    The symbol used to represent resistance in a schematic diagram is

609.    When resistors are put in series next to each other, their overall

resistance is

610.    When resistors are put in parallel with each other their overall

resistance is

611.    As more lamps are put into a series circuit, the overall current in

the circuit

612.    As more lamps are put into a parallel circuit, the overall current in

the circuit

613.    Compared to the resistance of two resistors connected in series, the

same two resistors connected in parallel have

614.    When one light bulb in a series circuit containing several light bulbs

burns out

615.    When one light bulb in a parallel circuit containing several light

bulbs burns out

616.    In a simple parallel circuit

617.    In a simple parallel circuit

618.    The total resistance of a 3-ohm resistor and a 6-ohm resistor in series is

619.    The total resistance of a 3-ohm resistor and a 6-ohm resistor in

parallel is

620.    Electrical elements in our homes are connected in

621.    Fuses and circuit breakers are used to

622.    A short circuit occurs when

623.    Two lamps, one with a thick filament and one with a thin filament, are

connected in series. The current is greater in the lamp with the

624.    Two lamps, one with a thick filament and one with a thin filament, are

connected in parallel to a battery. The voltage is greater across the lamp

with the

625.    Two lamps, one with a thick filament and one with a thin filament, are

connected in parallel to a battery. The current is larger in the lamp with

the

626.    Two lamps, one with a thick filament and one with a thin filament are

connected in series to a battery. The voltage is greater across the lamp

with the

627.    A 60-W light bulb is connected to a 12-V car battery. When another

60-W bulb is connected in parallel with the first bulb, the battery's

output energy

628.    A 60-W light bulb and a 100-W light bulb are each connected to a 120-V

outlet. Which light bulb has more current in it?

629.    The current through two identical light bulbs connected in series is

0.25 A. The total voltage across both bulbs is 110 V. The resistance of a

single light bulb is

630.    Huygens' principle says that

631.    As you get farther and farther from a point source of waves, the wave

fronts appear

632.    When plane waves pass through an opening, the wave fronts will not

change much if the opening is

633.    When a wave passes through an opening, some of the wave is bent. This

phenomenon is called

634.    Diffraction occurs only for

635.    Diffraction is a result of

636.    An interference pattern is produced when

637.    Colors seen when gasoline forms a thin film on water are a demonstration of

638.    Iridescent colors seen in the pearly luster of an abalone shell are due to

639.    Waves diffract the most when their wavelengths are

640.    Constructive interference occurs when

641.    Destructive interference occurs when

642.    Monochromatic light refers to light that is

643.    When monochromatic light shines through two closely spaced narrow

slits and onto a screen some distance away, the pattern on the screen has

644.    A diffraction grating consists of

645.    If you shine monochromatic light onto two plates of glass, one atop

the other, you will see light and dark fringes. The reason for this is that

light

646.    When gasoline drips on a wet street, you can see a beautiful spectrum

of colors. This phenomenon is called

647.    A thin film appears blue when illuminated with white light. The color

being canceled by destructive interference is

648.    Coherent light is many different rays of light all having the same

649.    Light emitted by a laser is

650.    A hologram is most closely related to

651.    Holograms exist because of

652.    Magnification can be accomplished with a hologram if it is viewed with

light that has a

653.    Interference can be shown by using