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PV diagram full circle cycle help

  1. Feb 28, 2010 #1
    1. The problem statement, all variables and given/known data

    I'm given a PV diagram, it goes from A, B, C, D, in a full circle, counter-clock wise. A is at the top, and is at 30 Pa and 25 m^3 for volume. B is at 20 Pa and 15 m^3. C is at 10 Pa and 25 m^3, and D is at 20 Pa and 35 m^3 (It goes in a full circle with A and C having the same volume, and B and D having the same pressure) Sorry I can't post a real picture of it. The question now asks:

    Calculate:

    A) The total internal energy in a full cycle from A-->B-->C-->D-->A

    B) The total work done on or by the system in a full cycle from A-->B-->C-->D-->A.

    C) The total heat flow in a full cycle from A-->B-->C-->D-->A

    D) The work done on or by the system from A-->B-->C


    2. Relevant equations

    PV=nRT
    (delta)U = Q - W


    3. The attempt at a solution

    I've thought about A, and see that in a full cycle the total change in internal energy would be 0, however I don't think that it's asking for the total change, just the total. Also for B, C, and D I'm having trouble trying to find the right equation, as I can't determine if this cycle would be isobaric, isochoric, isothermal, or adiabatic. Please help.
     
  2. jcsd
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