AnswersWA-Physical Science BLab: Kinetic Energy

Lab: Kinetic Energy — Unit test Answers

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A 4400 W motor is used to do work. If the motor is used for 200 s, how much work could it do? (Power: P = W/t)

A
22 J
B
4200 J
C
4600 J
D
880,000 J
2
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A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)

A
3.9 m
B
4.0 m
C
39.2 m
D
40.0 m
3

Hedea made a study chart about nuclear energy.Which best describes the error in Hedea’s chart?

Question illustration
A
The nuclei of atoms are split apart in both fission and fusion.
B
The nuclei of atoms are joined together in both fission and fusion.
C
Fission converts nuclear energy to electrical energy, not thermal energy.
D
Fission and fusion convert nuclear energy to both radiant and thermal energy.
4

Which is an example of potential energy?

A
a swimmer kicking their legs
B
a car driving on the road
C
an arrow flying at a target
D
a yo-yo in someone’s hand
5

Kyle has a mass of 54 kg and is jogging at a velocity of 3 m/s. What is Kyle’s kinetic energy? (Formula: )

Question illustration
A
18 J
B
81 J
C
162 J
D
243 J
6

Under which condition is no work done?

A
A force pushes an object and slows it down.
B
A force pulls an object and speeds it up.
C
A force pulls down on an object that moves downward.
D
A force pushes up on an object that stays in place.
7

Dimas reads that it takes 270 N to lift a firefighter’s equipment. If a firefighter does 5400 J of work carrying the equipment up a staircase, how high does the firefighter climb? (Work: W = Fd)

A
20 m
B
200 m
C
5130 m
D
1,458,000 m
8

How much time is needed for a 15,000 W engine to do 1,800,000 J of work? (Power: P = W/t)

A
0.008 s
B
8 s
C
120 s
D
1,785,000 s
9

What is the overall energy transformation in a coal-fired power plant?

A
electrical to chemical
B
chemical to electrical
C
nuclear to radiant
D
radiant to nuclear
10

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

A
It changes from 296 J to 432 J.
B
It changes from 379 J to 243 J.
C
It changes from 432 J to 296 J.
D
It changes from 243 J to 379 J.
11

Two examples of energy transformations are shown.

Question illustration
A
begin with chemical energy.
B
begin with electrical energy.
C
result in radiant energy.
D
result in mechanical energy.
12

Which best describes a difference between energy transformations in power plants and dams?

A
Only power plants use fossil fuels to transform energy.
B
Only dams use fission to generate thermal energy.
C
Only power plants use water to turn turbines.
D
Only dams use mechanical energy to produce electricity.

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