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Homework Help: Mass of gas required to lift another mass

  1. Feb 3, 2008 #1
    [SOLVED] mass of gas required to lift another mass

    1. The problem statement, all variables and given/known data

    A balloon contains gas of density G and is to lift a mass M, including the balloon but not the gas. Show that the minimum mass of gas required is m=(MG)/(A-G) where A is the atmospheric density.


    2. Relevant equations
    Basic density mass relationships?


    3. The attempt at a solution

    Obviously the density of the gas is less than the density of the atmosphere, thus the lifting force is possible. I'm just having a hard time seeing the relationships without actual numbers. I tried applying numbers to the situation but that hasn't seemed to help, like making G=.5 and A=1. I need a witty suggestion to jump start me. Thanks
     
  2. jcsd
  3. Feb 3, 2008 #2
    Figured It Out!!!
     
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