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Homework Help: Classical thermodynamics problem

  1. Apr 23, 2012 #1
    1. The problem statement, all variables and given/known data

    (i) State the Second Law of Thermodynamics in one or other of its forms.

    (ii) The heat capacity per unit volume of a particular solid at low temperatures is equal to CT3; find expressions for its internal energy and entropy S per unit volume (ignoring the effects of thermal expansion).

    2. Relevant equations

    3. The attempt at a solution

    (i) Kelvin's statement: No process is possible whose sole effect is complete conversion of heat into work.

    Clausius' statement: No process is possible whose sole effect is to transfer heat from a colder to a hotter body.

    (ii) Not sure. Any help would be awesome.
  2. jcsd
  3. Apr 23, 2012 #2
    Atleast show us the attempt
  4. Apr 23, 2012 #3
    Heat capacity = Internal energy/ Temperature, so Internal energy = CT4. Now, I know that this is wrong, but that's the point of me coming to the forum, so I can get the problem done quickly. Otherwise I can just read the lecture notes and get the problem done in 60 long and boring minutes, which isn't fun becasue I am a third year student and I am studying this for the comprehensive paper and if I take this long to do one problem, then i will take eternity to finish all the first and second year courses and so I might as well pack my bag and run for home.
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