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Carnot cycle problem - Is it thermodynamically possible to do 500J of work?

  1. Sep 27, 2014 #1
    1. The problem statement, all variables and given/known data
    250uhqe.png

    2. The attempt at a solution

    Is it only possible when 600J of heat is exhausted and 400J of heat is converted into work? Is the 600J heat will enter the cold reservoir and available to do work again?

    q1/T hot + q3 / T cold = 0
    q3 = 600 when T = 300K

     
  2. jcsd
  3. Oct 2, 2014 #2
    Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
  4. Oct 3, 2014 #3

    rude man

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    Gold Member


    Good.

    where did this come from?

    Use your previous equation but make it an inequality, not an equation, reflecting the fact that net entropy can only increase or stay at zero.
    You are given q1, q3, Thot and Tcold.
     
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