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)
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.
Your average speed is
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
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
a speed of about
20. One-half second after starting from rest, a freely falling object will
have a speed of about
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
time to return to its starting point is about
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
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.
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
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
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
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
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
89. What is the maximum resultant possible when adding a 3-N force to an
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
impact force of about
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
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
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
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
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
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
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
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
rotation about its axis would
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
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
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
change in radius, then your weight would
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
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
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
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
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
ladder would be
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
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
wavelength of a radio wave received at 100 megahertz is
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
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
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
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
421. A sound wave that has a wavelength of 1 meter in room-temperature air
has a frequency of about
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
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
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
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
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
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
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
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
the road surface
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
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
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
548. The image your eye receives is
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
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
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
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
are made from semiconductors. Semiconductors
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
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
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
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
610. When resistors are put in parallel with each other their overall
611. As more lamps are put into a series circuit, the overall current in
612. As more lamps are put into a parallel circuit, the overall current in
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
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
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
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
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
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
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
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
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