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Finding heat of a system

  1. Dec 4, 2006 #1
    1. The problem statement, all variables and given/known data
    A system expands by 0.67 m^3 at a constant pressure of 105 kPa. Find the heat of the system if its internal energy decreases by 1710J.

    2. Relevant equations
    Since P=constant:

    3. The attempt at a solution
    I tried plugging in the numbers to the equation for W and then plugging that value into the first equation to solve for U, but I didn't get the correct answer and I'm not sure where I went wrong.
  2. jcsd
  3. Dec 4, 2006 #2


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    Science Advisor
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    Nobody will know where you went wrong if you don't say what you plugged into where and what came out of that process.
  4. Dec 4, 2006 #3
    sorry, but while I was typing my process just now I realized what went wrong. Thank you!
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