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Homework Help: Classical thermodynamics problem.

  1. Jun 11, 2003 #1
    Hm, I'm pretty much stuck on a thermodynamics problem.

    If you consider two identical masses of water at temperatures T1 and T2, what is the global increase in entropy after they have reached thermal equilibrium.

    The best I could come up with is [del]S = m*C*ln(T2/T1).

    The answer listed in the book is 2m*C*ln[(T1+T2)/2Sqrt(T1*T2)]

    I am completely and utterly stuck. Any help would be greatly appreciated.

  2. jcsd
  3. Jun 11, 2003 #2
    This will probably be moved to HWK. help, but think about what the equilibrium temperature is, and the change in Entropy of each block.
  4. Jun 11, 2003 #3
    Yes, that's it. I've got it. Thanks.
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