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31 May, 01:39

The change in internal energy during one complete cycle of a heat engine A. equals the net heat flow into the engine. B. equals zero. C. equals the heat energy exhausted from the engine. D. equals the heat energy entering the engine.

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  1. 31 May, 01:59
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    B. equals zero

    Explanation:

    Given data

    one complete cycle = heat flow

    solution

    we have given that when heat engine complete 1 cycle change in energy = net heat flow

    that is always equal to zero

    from first law of thermodynamics that

    ΔU = Q + W

    we know ΔU is the change internal energy in system and Q is net heat transfer in system and W is net work done in system

    therefore change of internal energy during one cycle

    ΔU = Ufinal - Uinitial

    ΔU = Uinitial - Uinitial = 0
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