AnswersPhysicsWork, Power, and Energy

Work, Power, and Energy — Test Answers

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1
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Which pair of labels is correct?

A
B: Maximum gravitational potential energy D: Maximum kinetic energy
B
A: Maximum kinetic energy C: Maximum gravitational potential energy
C
B: Maximum kinetic energy D: Maximum gravitational potential energy
D
A: Maximum gravitational potential energy C: Maximum kinetic energy
6

If 3 comma 600 J of work is done in 3 point 0 s , what is the power?

A
11 comma 000 W
B
0 point 0 0 0 8 3 W
C
1 comma 200 W
D
3 comma 600 W
7

What is the unit for work?

A
joule
B
newton
C
meter
D
watt
8

What is the best description of the energy stored in a stretched or compressed object?

A
potential energy
B
gravitational potential
C
spring constant
D
elastic potential
9

Energy can be changed from one form to another. Which terms can be used to describe these changes? Choose two correct answers.

A
energy conservation
B
energy correlation
C
energy conversion
D
energy transformation
E
energy transference
11

Which best identifies the requirements for work to be performed?

A
a force acting on a motionless object
B
an object that has a force acting on it
C
a force that moves an object
D
an object that is moving and has no net force
13

Which object has the least amount of kinetic energy?

A
Image with description A picture of a roller coaster train half way down the first hill of a roller coaster track.
B
Image with description A picture of a person filling a glass of water from the faucet to overflowing.
C
Image with description A picture of a golf ball on a grass covered hill in sunlight.
D
Image with description A picture of a spinning top.
14

If 3 comma 600 J of work is done in 3 point 0 s , what is the power?

A
11 comma 000 W
B
1 comma 200 W
C
0 point 0 0 0 8 3 W
D
3 comma 600 W
16

Which best identifies the requirements for work to be performed?

A
a force acting on a motionless object
B
an object that is moving and has no net force
C
an object that has a force acting on it
D
a force that moves an object
17

A box is released from rest and slides down a ramp in a closed system. Even though the box speeds up, its kinetic energy at the bottom of the ramp is less than the potential energy that it had at the top of the ramp. What best explains why the box’s final kinetic energy is less than its initial potential energy?

A
In a closed system, kinetic energy is always less than potential energy.
B
In a closed system, total energy is constantly being lost to outside objects.
C
The acceleration due to gravity became smaller as the box slid down the ramp.
D
Some potential energy was converted into thermal energy due to friction.
20

What must be true of an object that has gravitational potential energy?

A
It is compressed shorter than a given length.
B
It is above a reference point.
C
It is stretched beyond a certain length.
D
It is moving past a reference point.

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