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19 October, 12:13

Fifteen joules of heat are added to a cylinder with a piston. The system uses 7 joules of energy to raise the piston upward. By how much did the internal energy of the system increase?

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  1. 19 October, 13:19
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    8 J

    Explanation:

    Heat = work + change in internal energy

    Q = W + ΔU

    15 J = 7 J + ΔU

    ΔU = 8 J
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