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Homework Help: Heat Q flows spontaneously from a reservoir at 394 K

  1. Sep 18, 2010 #1
    Heat Q flows spontaneously from a reservoir at 394 K into a reservoir that has a lower temerature T. Because of the spontaneous flow, thirty percent of Q is rendered unavailable for work when a Carnot engine operates between the reservoir at temperature T and reservoir at 248 K. Find the temperature T.

    First of all... I don't even understand the problem.

    I know the change in entropy equals the heat (Q) divided by the temperature (T). I also know that the work unavailable (W) equals the temp of the coldest reservoir multiplied by the change of entropy of the universe.

    I would appreciate any help!! Thanks
  2. jcsd
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