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Basic ThermoDynamics Questions

  1. Sep 19, 2008 #1
    1. The problem statement, all variables and given/known data

    The energy of a particular system,of one mole, is given by: U = AP^2 V (A)
    where A is a positive constant of units [P^(-1)]. Find the equation of the adiabat in the P-V plane

    2. Relevant equations
    I guess dQ = 0 (1) and dU + PdV= 0 (2)

    3. The attempt at a solution
    I tried to express the gien energy equation as fct of P and V, seemed too simple and still being stuck with a U (however on the P-V plane it seemed coherent) so I tried using eq. 2, as
    dU+Pdv = 0
    dU= -PdV
    integrate: U+U_0 = P (V_0 - V)
    and substitute in eq. A for U
    and got P^2(AV) - P(V_0-V)+U_0 = 0

    and stuck there, is this a way to go or completely wrong mehod? Its my first problem in this class and I really have a hard time getting the concepts ^^
    Thanks for any help.
  2. jcsd
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