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Inflating balloon

  1. Nov 22, 2006 #1
    This is one of many postings from me this week :yuck: unfortunately I'm just not getting the correct answers...anyway here I go :

    A toy balloon is inflated with helium at a constant pressure that is 4.2e5 Pa in excess of atmospheric pressure. If the balloon inflates from a volume of 1.4e-4m3 to 9.6e-4m3, how much work is done by the balloon on the surrounding air? answer in J
    this is my work

    P= 4.2e5Pa + 101300Pa
    = 521 300 Pa
    dV = (Vf-Vi) = (9.6e-4 - 1.4e-4)
    = 0.00082m3

    W= 521 300Pa x (0.00082m3)
    427.466 J (incorrect on homework server)

    I'm guessing it has something to do with the work on the surrounding air...I have been looking in my books and course notes for this and I can't find anything...can anybody help me out??

    Any help is appreciated,
    Sergio
     
  2. jcsd
  3. Nov 22, 2006 #2
    Is this what the problem is supposed to be: A toy balloon is inflated with helium at a constant pressure that is [tex]4.2e^5[/tex] Pa in excess of atmospheric pressure. If the balloon inflates from a volume of [tex]1.4e^{-4}m^3[/tex] to [tex]9.6e^{-4}m^3[/tex], how much work is done by the balloon on the surrounding air? answer in J

    (?)
     
  4. Nov 22, 2006 #3
    Yes thats exactly the question on my homework page :)
     
  5. Nov 23, 2006 #4
    Hey we finally got the answer...for the pressure...do not add the atmospheric pressure...simply use the one in the question

    THank you for your time

    Sergio
     
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