Chapter 7: Energy Flashcards

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1
Q

If you push for a half hour or a whole hour against a stationary wall: a) twice as much work is done during the half hour; b) it is impossible to determine how much work is done; c) half as much work is done during the half hour; d) no work on the wall is done in either case.

A

d) no work on the wall is done in either case.

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2
Q

If you push an object a given distance, while applying twice the force, you do: a) twice as much work; b) the same amount of work; c) four times as much work; d) half as much work.

A

a) twice as much work.

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3
Q

If you do work on an object in one-third the usual time, your power output is: a) three times the usual power output; b) the usual power output; c) impossible to predict without additional information; d) one third the usual power output.

A

a) three times the usual power output.

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4
Q

Do 100 J of work in 50 s and your power output is

A

2 W

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5
Q

An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is: a) twice as much; b) four times as much; c) half as much; d) the same.

A

a) twice as much.

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6
Q

An object that has kinetic energy must be

A

moving.

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7
Q

An object may have potential energy because of its: a) location; b) acceleration; c) speed; d) momentum; e) none of these.

A

a) location.

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8
Q

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

A

half as much.

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9
Q

After rolling halfway down an incline, a marble’s kinetic energy is: a) the same as its potential energy; b) less than its potential energy; c) impossible to determine; d) greater than its potential energy.

A

a) the same as its potential energy.

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10
Q

No work is done by gravity on a bowling ball that rolls along a bowling alley because: a) the force on the ball is at right angles to the ball’s motion; b) no potential energy is being converted to kinetic energy; c) its kinetic energy remains constant; d) no force acts on the ball; e) no distance is covered by the ball.

A

a) the force on the ball is at right angles to the ball’s motion.

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