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Eight books, each 8.5 cm thick with mass 1.3 kg, lie flat on a table.How much work is required to stack them one on top of another?

  • physic -

    The average height before is 4.25cm
    The average height after is 4*8.25cm

    work=7(1.3)*(4*.0825 - .0425)*9.8 joules
    work = massmoved*change height*g

    Make certain you know why seven masses are in the calculation.

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