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Blowing up a balloon

  1. Oct 25, 2013 #1
    1. The problem statement, all variables and given/known data

    A balloon behaves such that the pressure is P = CV3 where C = 100 kPa/m3. The balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3. Find the work done by the air.

    2. Relevant equations

    W=∫PΔV... something to do with integrating to find the work (the area under the curve)

    3. The attempt at a solution

    I found P1= 100 kPa/m3 x (1m3)3 = 100 kPa
    I also found P2 = 100 kPa/m3 x (3m3)3 = 900 kPa
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 26, 2013 #2

    rude man

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    Homework Helper
    Gold Member

    So use that formula! (You don't need to find p anywhere).
     
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