Question 1

Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is

Accepted Answer

A) twice as much as the 25-kg sack. 
B) half as much as the 25-kg sack. 
C) the same. 
D) need more information 
A) twice as much as the 25-kg sack. 
B) half as much as the 25-kg sack. 
C) the same. 
D) need more information

Question 2

A hydraulic jack is used to lift objects such as automobiles. If the input force is 200 N over a distance of 1 meter, the output force over a distance of 0.1 meter is ideally

Accepted Answer

A) 200 N. 
B) 500 N. 
C) 1000 N. 
D) 2000 N. 
E) none of the above 
A) 200 N. 
B) 500 N. 
C) 1000 N. 
D) 2000 N. 
E) none of the above

Question 3

Strictly speaking, more fuel is consumed by your car if the air conditioner, headlights, or even a radio is turned on. This statement is

Accepted Answer

A) false. 
B) true only if the car's engine is running. 
C) true. 
A) false. 
B) true only if the car's engine is running. 
C) true.

Question 4

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 more

Accepted Answer

A) momentum, but less kinetic energy. 
B) kinetic energy, but less momentum. 
C) momentum and more kinetic energy. 
D) need more information 
A) momentum, but less kinetic energy. 
B) kinetic energy, but less momentum. 
C) momentum and more kinetic energy. 
D) need more information

Question 5

About 40 J is required to push a crate 4 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about

Accepted Answer

A) 4 N. 
B) 10 N. 
C) 40 N. 
D) 160 N. 
A) 4 N. 
B) 10 N. 
C) 40 N. 
D) 160 N.

Question 6

When properly used, a hydraulic press, like a wheel and axle, is capable of multiplying force input.

Accepted Answer

A) A true statement. 
B) A false statement. 
C) Yes, and in special cases, energy as well. 
A) A true statement. 
B) A false statement. 
C) Yes, and in special cases, energy as well.

Question 7

A clerk can lift cylindrical packages 1 meter vertically, 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) the same. 
C) twice as much. 
D) four times as much. 
A) half as much. 
B) the same. 
C) twice as much. 
D) four times as much.

Question 8

When wind encounters a wind turbine that produces energy, wind speed on the downside of the blades is

Accepted Answer

A) slowed. 
B) speeded up. 
C) not affected. 
A) slowed. 
B) speeded up. 
C) not affected.

Question 9

A crate of grapes lifted 10 meters gains 200 J of potential energy. If the same crate is instead lifted 20 meters, its gain in potential energy is

Accepted Answer

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

Question 10

The work done in pushing a TV set a distance of 2 m with an average force of 20 N is

Accepted Answer

A) 2 J. 
B) 10 J. 
C) 20 J. 
D) 40 J. 
E) 800 J. 
A) 2 J. 
B) 10 J. 
C) 20 J. 
D) 40 J. 
E) 800 J.

Question 11

No work is done by gravity on a bowling ball that rolls along a bowling alley because

Accepted Answer

A) no force acts on the ball. 
B) little distance is covered by the ball. 
C) the force on the ball is at right angles to the ball's motion. 
D) the ball's speed remains constant. 
A) no force acts on the ball. 
B) little distance is covered by the ball. 
C) the force on the ball is at right angles to the ball's motion. 
D) the ball's speed remains constant.

Question 12

Phil applies 100 N to a pulley system and raises a load one-tenth of his downward pull. Ideally, the weight of the load is

Accepted Answer

A) 100 N. 
B) 1000 N. 
C) 10,000 N. 
D) more than 10,000 N 
A) 100 N. 
B) 1000 N. 
C) 10,000 N. 
D) more than 10,000 N

Question 13

One kilowatt-hour represents

Accepted Answer

A) 1 N. 
B) 60 N/s. 
C) 60,000 W. 
D) 3.6 million joules. 
E) none of these 
A) 1 N. 
B) 60 N/s. 
C) 60,000 W. 
D) 3.6 million joules. 
E) none of these

Question 14

Relative to an initial height, an object raised twice as high has a gravitational potential energy

Accepted Answer

A) half as much 
B) twice as much. 
C) four times as much. 
D) need more information 
A) half as much 
B) twice as much. 
C) four times as much. 
D) need more information

Question 15

A bicycle that travels four as fast as another when braking to a stop will skid

Accepted Answer

A) twice as far. 
B) four times as far. 
C) eight times as far 
D) sixteen times as far. 
E) depends on the mass of the bike 
A) twice as far. 
B) four times as far. 
C) eight times as far 
D) sixteen times as far. 
E) depends on the mass of the bike

Question 16

Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

Accepted Answer

A) the same distance. 
B) two times as far. 
C) four times as far. 
D) more than four times as far. 
E) none of the above 
A) the same distance. 
B) two times as far. 
C) four times as far. 
D) more than four times as far. 
E) none of the above

Question 17

The exhaust product from a hydrogen fuel cell is

Accepted Answer

A) carbon dioxide. 
B) methane. 
C) pure water. 
D) nitric acid. 
A) carbon dioxide. 
B) methane. 
C) pure water. 
D) nitric acid.

Question 18

A common pulley acts similar to a

Accepted Answer

A) hydraulic press. 
B) gear. 
C) common lever. 
D) tension producer. 
A) hydraulic press. 
B) gear. 
C) common lever. 
D) tension producer.

Question 19

A moving object has

Accepted Answer

A) speed. 
B) velocity. 
C) momentum. 
D) energy. 
E) all of these 
A) speed. 
B) velocity. 
C) momentum. 
D) energy. 
E) all of these

Question 20

A 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.

Exam 7: Energy

Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is

A hydraulic jack is used to lift objects such as automobiles. If the input force is 200 N over a distance of 1 meter, the output force over a distance of 0.1 meter is ideally

Strictly speaking, more fuel is consumed by your car if the air conditioner, headlights, or even a radio is turned on. This statement is

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 more

About 40 J is required to push a crate 4 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about

When properly used, a hydraulic press, like a wheel and axle, is capable of multiplying force input.

A clerk can lift cylindrical packages 1 meter vertically, or can roll them up a 2-meter-long ramp to the same elevation. With the ramp, the applied force required is about

When wind encounters a wind turbine that produces energy, wind speed on the downside of the blades is

A crate of grapes lifted 10 meters gains 200 J of potential energy. If the same crate is instead lifted 20 meters, its gain in potential energy is

The work done in pushing a TV set a distance of 2 m with an average force of 20 N is

No work is done by gravity on a bowling ball that rolls along a bowling alley because

Phil applies 100 N to a pulley system and raises a load one-tenth of his downward pull. Ideally, the weight of the load is

One kilowatt-hour represents

Relative to an initial height, an object raised twice as high has a gravitational potential energy

A bicycle that travels four as fast as another when braking to a stop will skid

Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Compared with penetration of the slow arrow, the faster arrow penetrates

The exhaust product from a hydrogen fuel cell is

A common pulley acts similar to a

A moving object has

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

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