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Work, Power, and Energy — Test Answers

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Which best summarizes Brandi’s statement about doing work while posing?

A
She did more work using her right hand than her left because her right hand was higher.
B
She did no work because she did not move the scales or sword while she posed.
C
She did no work because she did not exert any forces on objects.
D
She did work the entire time she posed because she was tired at the end.
24
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This roller coaster’s track is nearly frictionless, so resistance can be ignored. Using g is equal to 9 point 8 the fraction with numerator m and denominator s squared , what best describes the roller coaster car when it is at the top of the loop-de-loop?

A
The car has only potential energy, so it is moving at 0 meters per second .
B
The car has both potential and kinetic energy, and it is moving at 24.6 meters per second .
C
The car’s potential energy has all been converted to kinetic energy, so it moves at 42.7 meters per second .
D
The car has both potential and kinetic energy, and it is moving at 34.9 meters per second .
25

What conclusion is best supported by Lamar’s work?

A
The elastic potential energy is the same for any distance from a reference point.
B
The elastic potential energy equals the work needed to stretch the object.
C
The gravitational potential energy is the same for any distance from a reference point.
D
The gravitational potential energy equals the work needed to lift the object.

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Work, Power, and Energy — Test Answers — Physics