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Homework Help: Calculating Entropy of a Star using Heat Capacity

  1. Feb 6, 2012 #1
    1. The problem statement, all variables and given/known data
    Using the viral theorem, the heat capacity of a star is given as C=-3*k/2.
    Using this, I need to calculate the entropy of a star in terms of the average temperature T, then in terms of U (total energy).

    2. Relevant equations

    3. The attempt at a solution
    To solve for S, I integrated getting S=-(3/2)*k*ln(tf/ti)+C. How do I solve this for S? This function is undefined when Temperature is 0...

    Thanks in advance!
  2. jcsd
  3. Feb 6, 2012 #2


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  4. Feb 6, 2012 #3
    That is what I was thinking too, but the problem specifically states that you need to use the heat capacity to determine the Entropy. :(
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