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29 December, 19:01

1) A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder?

2) An apple weighing 1 N falls a distance of 1 m. How much work is done on the apple by the force of gravity?

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  1. 29 December, 21:54
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    1) 130, 000 J

    2) 1 J

    Explanation:

    1)

    Work done is product of force in Newtons and distance in meters

    W=Fd

    Given an average force of 5,200 N and distance of 25 m then we evaluate that

    Work done=5200*25=130, 000 Nm or Joules

    2)

    Similarly, for the second question, given force of 1N and distace of 1 m then the work done will be

    W=1*1=1 J
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