At a construction site, the site manager notices that a crane takes 20 seconds to lift a 500kg steel beam up to a height of 15 meters. From this information, he calculates the power output of the crane to be what value?

Question

Physics

Jerimiah Acosta

5 November, 20:06

At a construction site, the site manager notices that a crane takes 20 seconds to lift a 500kg steel beam up to a height of 15 meters. From this information, he calculates the power output of the crane to be what value?

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Answers (1)

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Nakita · Answer 1

The work done is equal to the change in potential energy which is:

P. E = mgh

P. E = 500 x 9.81 x 15

P. E = 73,575 J

Power = work / time

Power = 73,575 / 20

Power = 3,700 Watts