A machine does $600$ J of work in $20$ s. Find its power.
A$12000$ W
B$30$ WCORRECT
C$620$ W
D$0.033$ W
JUPEBPhysicsWork, Energy and Power
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Why the answer is B, and why the others tempt you.
Power $= \dfrac{\text{work}}{\text{time}} = \dfrac{600}{20} = 30$ W. Inverting the ratio gives 0.033.
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