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Homework Help: Thermodynamic Cycle Question

  1. Sep 29, 2009 #1
    1. The problem statement, all variables and given/known data

    Im given a table with values for Delta(Internal energy), Delta(KE), Delta(PE), Delta(E), Q, and W.

    For certain ones, certain values are missing and I have to fill in the blanks.

    Specifically- D()= Delta
    Process 1-2) D(U) =72, D(KE)= =5 , D(PE)= -6, D(E) = ? , Q=0 , W= ?
    Process 2-3.) D(U)=64 , D(KE)=0 , D(PE) = ? , D(E) = ? , Q = 90, W= ?
    2. Relevant equations

    Delta(E)= Delta(U) +Delta(KE) + Delta(PE)


    3. The attempt at a solution

    For Process 1-2, I found the values of D(E) and W because there were only 2 unkowns so I could plug it into the given equations and solve for the unknowns. For Process 2-3 (And the rest of the remaining processes not listed) I have no idea what to do because there are 3 unknowns and 2 equations that I see fit to use. Ive tried re-arranging and plugging different values in but im stuck. Can someone give me a hand?
  2. jcsd
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