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3 January, 22:15

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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  1. 3 January, 23:38
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    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
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