Answers FL-2003310-Physical Science CRLab: Thermal Energy Transfer

Lab: Thermal Energy Transfer — Unit test Answers

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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

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Which best defines energy?

a type of wave that carries energy through space, where there is almost no matter

a disturbance that carries energy form one place to another through matter and space

the ability to do work

pressing to make more compact

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

electrical to chemical

chemical to electrical

nuclear to radiant

radiant to nuclear

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

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.

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

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

Two examples of energy transformations are shown.

begin with chemical energy.

begin with electrical energy.

result in radiant energy.

result in mechanical energy.

Which will reduce the possible environmental damage associated with mining uranium?

installing newer water recycling systems in older power plants

increasing the reprocessing of used fuel for reuse

building additional fission nuclear power plants

developing better places to store radioactive wastes

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Lab: Thermal Energy Transfer — Unit test Answers

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