How long would it take a 400 W motor to transfer 2000 J of energy?

Choose 1 answer

5 s

50 s

0.2 s

0.02 s

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A ball dropped from a cliff has 100 J in its GPE store as it is released. What is the value of the KE store when it just reaches the ground?

Choose 1 answer

50 J

10 J

100 J

0 J

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What is the power of a motor that transfers 450 J of energy in 9 s?

Drag the images into the correct place.

correct answer

incorrect answers

5 W

50 W

4050 W

0.02 W

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Which is the correct statement about closed systems?

Choose 1 answer

an object or group of objects that energy cannot leave or enter

a group of objects that energy cannot leave

all the objects in the universe

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Fill in the blanks

Select the missing words in the text.

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Answer incorrect

Look at the slide below to work out the answer.