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Question:

What answers fits in this?

What answers fits in this?

Answer:

The work done by both cranes is W Fd (20,000)(300) 6,000,000 J Let's say crane 1 lifts it in 5 secondsCrane 2 can lift it in 1/5 the time that crane 1 lifts so 1 secondFind the power for both P1 W/t 6,000,000/5 1,200,000 W P2 W/t 6,000,000/1 6,000,000 W Therefore, the faster crane has 5x the powerAnswer is (2) A quicker way to see this is that Power is indirectly proportional to timeReducing the time by 1/5 increases the power by a factor of 5.

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