Question 1

A golf ball is thrown at and bounces backward from a massive bowling ball that is initially at rest.After the collision,compared to the golf ball,the bowling ball has

Accepted Answer

A) more momentum,but less kinetic energy. 
B) more kinetic energy,but less momentum. 
C) more momentum and more kinetic energy. 
D) less momentum and less kinetic energy. 
E) Not enough information is given to say. 
A) more momentum,but less kinetic energy. 
B) more kinetic energy,but less momentum. 
C) more momentum and more kinetic energy. 
D) less momentum and less kinetic energy. 
E) Not enough information is given to say.

Question 2

Neglecting air resistance,a man on a high ladder releases a ball which strikes the ground with 100 J of kinetic energy.If he were to throw it straight upward instead,it will eventually reach the ground with a kinetic energy of

Accepted Answer

A) 100 J. 
B) more than 100 J. 
C) less than 100 J. 
A) 100 J. 
B) more than 100 J. 
C) less than 100 J.

Question 3

When a rifle is fired,it recoils as the bullet is set in motion.The rifle and bullet ideally acquire equal

Accepted Answer

A) but opposite amounts of momentum. 
B) amounts of kinetic energy. 
C) both of these 
D) neither of these 
A) but opposite amounts of momentum. 
B) amounts of kinetic energy. 
C) both of these 
D) neither of these

Question 4

A clerk can lift containers a vertical distance of 1 meter or can roll them up a 2 meter-long ramp to the same elevation.With the ramp,the applied force required is about

Accepted Answer

A) half as much. 
B) twice as much. 
C) the same. 
D) four times as much. 
A) half as much. 
B) twice as much. 
C) the same. 
D) four times as much.

Question 5

If you find that twice as much work is needed to perform a task but it takes twice as much time,the amount of power required is

Accepted Answer

A) twice as much. 
B) four times as much. 
C) sixteen times as much. 
D) unchanged. 
A) twice as much. 
B) four times as much. 
C) sixteen times as much. 
D) unchanged.

Question 6

A flower pot of mass m falls from rest to the ground below,a distance h.Which statement is correct?

Accepted Answer

A) The speed of the pot when it hits the ground is proportional to h. 
B) The KE of the pot when it hits the ground is proportional to h. 
C) The KE of the pot when it hits the ground does not depend on m. 
D) The speed of the pot when it hits the ground depends on m. 
E) None of these are correct. 
A) The speed of the pot when it hits the ground is proportional to h. 
B) The KE of the pot when it hits the ground is proportional to h. 
C) The KE of the pot when it hits the ground does not depend on m. 
D) The speed of the pot when it hits the ground depends on m. 
E) None of these are correct.

Question 7

A car has a head-on collision with another car that was approaching with the same magnitude of momentum.A third identical car driving with the same speed as the first car runs into an enormously massive wall.Which of the four objects will experience the greatest impulse?

Accepted Answer

A) the approaching car 
B) the second car 
C) the third car 
D) the wall 
E) All will receive the same impulse. 
A) the approaching car 
B) the second car 
C) the third car 
D) the wall 
E) All will receive the same impulse.

Question 8

Suppose a miracle car has a 100% efficient engine and burns fuel that has a 40-megajoules-per-liter energy content.If the air drag and overall frictional forces on this car traveling at highway speeds total 1000 N,what is the overall limit in distance per liter it could be driven on the highway?

Accepted Answer

A) 30 km 
B) 40 km 
C) 50 km 
D) more than 50 km 
E) not enough information 
A) 30 km 
B) 40 km 
C) 50 km 
D) more than 50 km 
E) not enough information

Question 9

If you do work on an object in one-third the usual time,your power output is

Accepted Answer

A) one third the usual power output. 
B) the usual power output. 
C) three times the usual power output. 
D) impossible to predict without additional information. 
A) one third the usual power output. 
B) the usual power output. 
C) three times the usual power output. 
D) impossible to predict without additional information.

Question 10

A popular swinging-balls apparatus consists of an aligned row of identical elastic balls that are suspended by strings so they barely touch each other.When two balls are lifted from one end and released,they strike the row and two balls pop out from the other end.If instead one ball popped out with twice the speed of the two,this would be a violation of conservation of

Accepted Answer

A) momentum. 
B) energy. 
C) both of these 
D) none of these 
A) momentum. 
B) energy. 
C) both of these 
D) none of these

Question 11

An object may have potential energy because of its

Accepted Answer

A) speed. 
B) acceleration. 
C) momentum. 
D) location. 
E) none of these 
A) speed. 
B) acceleration. 
C) momentum. 
D) location. 
E) none of these

Question 12

An object at rest may also have

Accepted Answer

A) speed. 
B) velocity. 
C) momentum. 
D) kinetic energy. 
E) potential energy. 
A) speed. 
B) velocity. 
C) momentum. 
D) kinetic energy. 
E) potential energy.

Question 13

A pile driver hits the top of a telephone pole,driving it partway into the ground.The distance that the pole will sink into the ground depends on

Accepted Answer

A) the original height of the pile driver weight. 
B) the original potential energy of the pile driver weight. 
C) the kinetic energy of the pile driver weight when it first contacted the pole. 
D) any of the above choices 
A) the original height of the pile driver weight. 
B) the original potential energy of the pile driver weight. 
C) the kinetic energy of the pile driver weight when it first contacted the pole. 
D) any of the above choices

Question 14

A diver who weighs 500 N steps off a diving board that is 10 m above the water.The diver hits the water with kinetic energy of

Accepted Answer

A) 10 J. 
B) 500 J. 
C) 510 J. 
D) 5000 J. 
E) more than 5000 J. 
A) 10 J. 
B) 500 J. 
C) 510 J. 
D) 5000 J. 
E) more than 5000 J.

Question 15

How many Joules of energy are in one kilowatt-hour?

Accepted Answer

A) 1 
B) 60 
C) 60,000 
D) 3)6 million 
E) none of these 
A) 1 
B) 60 
C) 60,000 
D) 3)6 million 
E) none of these

Question 16

The ball rolling down an incline has its maximum potential energy at

Accepted Answer

A) the top. 
B) a quarter of the way down. 
C) halfway down. 
D) the bottom. 
A) the top. 
B) a quarter of the way down. 
C) halfway down. 
D) the bottom.

Question 17

When an automobile is braked to a stop,its kinetic energy is transformed to

Accepted Answer

A) stopping energy. 
B) potential energy. 
C) energy of motion. 
D) energy of rest. 
E) heat. 
A) stopping energy. 
B) potential energy. 
C) energy of motion. 
D) energy of rest. 
E) heat.

Question 18

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

Accepted Answer

A) impulse. 
B) momentum. 
C) acceleration. 
D) force. 
E) none of these 
A) impulse. 
B) momentum. 
C) acceleration. 
D) force. 
E) none of these

Question 19

If the speed of a moving object doubles,which of the following also doubles?

Accepted Answer

A) momentum 
B) kinetic energy 
C) acceleration 
D) all of the above 
A) momentum 
B) kinetic energy 
C) acceleration 
D) all of the above

Question 20

When bullets are fired from an airplane in the forward direction,the momentum of the airplane will be

Accepted Answer

A) decreased. 
B) unchanged. 
C) increased. 
A) decreased. 
B) unchanged. 
C) increased.

Exam 7: Energy

A golf ball is thrown at and bounces backward from a massive bowling ball that is initially at rest.After the collision,compared to the golf ball,the bowling ball has

Neglecting air resistance,a man on a high ladder releases a ball which strikes the ground with 100 J of kinetic energy.If he were to throw it straight upward instead,it will eventually reach the ground with a kinetic energy of

When a rifle is fired,it recoils as the bullet is set in motion.The rifle and bullet ideally acquire equal

A clerk can lift containers a vertical distance of 1 meter or can roll them up a 2 meter-long ramp to the same elevation.With the ramp,the applied force required is about

If you find that twice as much work is needed to perform a task but it takes twice as much time,the amount of power required is

A flower pot of mass m falls from rest to the ground below,a distance h.Which statement is correct?

A car has a head-on collision with another car that was approaching with the same magnitude of momentum.A third identical car driving with the same speed as the first car runs into an enormously massive wall.Which of the four objects will experience the greatest impulse?

Suppose a miracle car has a 100% efficient engine and burns fuel that has a 40-megajoules-per-liter energy content.If the air drag and overall frictional forces on this car traveling at highway speeds total 1000 N,what is the overall limit in distance per liter it could be driven on the highway?

If you do work on an object in one-third the usual time,your power output is

An object may have potential energy because of its

An object at rest may also have

A pile driver hits the top of a telephone pole,driving it partway into the ground.The distance that the pole will sink into the ground depends on

A diver who weighs 500 N steps off a diving board that is 10 m above the water.The diver hits the water with kinetic energy of

How many Joules of energy are in one kilowatt-hour?

The ball rolling down an incline has its maximum potential energy at

When an automobile is braked to a stop,its kinetic energy is transformed to

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

If the speed of a moving object doubles,which of the following also doubles?

When bullets are fired from an airplane in the forward direction,the momentum of the airplane will be

About Science

Newtons First Law of Motion: Inertia

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Atomic Nature of Matter

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