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26 August, 23:14

A man exerts 700 newtons of force to move a piece of furniture 4 meters. if it takes him 2 seconds to move the furniture how much power does it require

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  1. 27 August, 01:57
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    If he moves the piano 4 meters, with 700 newtons of force

    in the direction of the motion, then the work done is

    Work = (force) x (distance)

    = (700 N) x (4 m) = 2,800 joules.

    If he does all of that in 2 seconds, then

    he did it at the rate of

    (work) / (time) = (2,800 J) / (2 sec) = 1,400 watts

    (about 1.88 'horsepower'!)
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