Answers SY2025-26 - 2002040 MJ Comprehensive Science 1 Sem 1 CRLab: Kinetic Energy

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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)

22 J

4200 J

4600 J

880,000 J

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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)

3.9 m

4.0 m

39.2 m

40.0 m

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

The nuclei of atoms are split apart in both fission and fusion.

The nuclei of atoms are joined together in both fission and fusion.

Fission converts nuclear energy to electrical energy, not thermal energy.

Fission and fusion convert nuclear energy to both radiant and thermal energy.

Which is an example of potential energy?

a swimmer kicking their legs

a car driving on the road

an arrow flying at a target

a yo-yo in someone’s hand

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

18 J

81 J

162 J

243 J

Under which condition is no work done?

A force pushes an object and slows it down.

A force pulls an object and speeds it up.

A force pulls down on an object that moves downward.

A force pushes up on an object that stays in place.

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)

20 m

200 m

5130 m

1,458,000 m

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

0.008 s

8 s

120 s

1,785,000 s

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

electrical to chemical

chemical to electrical

nuclear to radiant

radiant to nuclear

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?

It changes from 296 J to 432 J.

It changes from 379 J to 243 J.

It changes from 432 J to 296 J.

It changes from 243 J to 379 J.

Two examples of energy transformations are shown.

begin with chemical energy.

begin with electrical energy.

result in radiant energy.

result in mechanical energy.

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

Only power plants use fossil fuels to transform energy.

Only dams use fission to generate thermal energy.

Only power plants use water to turn turbines.

Only dams use mechanical energy to produce electricity.

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