jfedele jfedele

18-02-2017
Physics

Answered

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?

Verified Answer :

scme1702 scme1702

23-02-2017

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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