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9 April, 21:22

If you carry a U. S penny (weighing 0.025 N) to the top of the Empire state building (449m) how much work have you done to the penny?

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  1. 9 April, 21:37
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    The work you have done on the penny is the amount of gravitational potential energy it has when it reaches the top.

    Gravitational PE = (weight) x (height)

    = (0.025 N) x (449 m)

    = 11.225 joules.

    That's about the same amount of work it takes to carry

    one pound of butter to the top of an 8.5-foot ladder.
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