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    Eddie_G's Avatar
    Eddie_G Posts: 4, Reputation: 1
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    #1

    Aug 14, 2007, 09:18 AM
    Random 10?
    A building hoist lifts ten 50 kg bags of cement through a vertical distance
    of 30 m to the top of a high rise building. Calculate the work done by the
    hoist, assuming the acceleration due to gravity to be 9.81 m/s2.
    Work done = Force x Distance moved (J)
    but Force = Mass x Acceleration (N)
    Work done = Mass x Acceleration x Distance moved (J)
    Work done = 10 x 50 kg x 9.81 m/s2 x 30m
    Work done = 147.15 kJ.

    my problem is where does the 'red' 10 come into the equation?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Aug 14, 2007, 10:10 AM
    ten 50kg bags?
    Eddie_G's Avatar
    Eddie_G Posts: 4, Reputation: 1
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    #3

    Aug 14, 2007, 10:12 AM
    Why am I a retard? Hahaha
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Aug 14, 2007, 10:13 AM
    Physics cannot answer that one.

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