Answers2003390-Physics 1 Honors Sem. 1 - PetersCircular Motion

Work and Power Answers

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1
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In which scenario is an animal doing work? Check all that apply.

A
A cat lifts up her kitten by its neck.
B
A dog rubs his back against a large tree.
C
A bird flies a worm from the ground to its nest in a tree.
D
A goat butts its head against the barn wall.
E
A horse pulls a wagon along a road.
2
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Natalia lifts a bag of groceries 0.50 m by exerting a force of 36 N. How much work did she do on the bag?

A
0 J
B
18 J
C
36 J
D
72 J
3

A crane does 9,500 J of work to lift a crate straight up using a force of 125 N. How high does the crane lift the crate?

A
0.013 m
B
76 m
C
9,400 m
D
1,200,000 m
4

Which best identifies the requirements for work to be performed?

A
an object that has a force acting on it
B
an object that is moving and has no net force
C
a force acting on a motionless object
D
a force that moves an object
5

A load of bricks is lifted to the second floor of a building. How do work and power relate to this job?

A
The longer the job takes, the more work is done.
B
The faster the job is done, the greater the power.
C
The greater the power applied, the more work is done.
D
The less work is done, the more power is needed.
6

Brandi poses as Lady Justice for a skit in her government class. She holds a set of scales above her head with her right hand and a sword by her side in her left hand. She holds the pose for 10 minutes. At the end of the skit, she mentions to her friend that it was a lot of work to pose and that her arms were really tired.

A
She did no work because she did not exert any forces on objects.
B
She did more work using her right hand than her left because her right hand was higher.
C
She did no work because she did not move the scales or sword while she posed.
D
She did work the entire time she posed because she was tired at the end.

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