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Hot air balloon

  1. Nov 27, 2008 #1
    1. The problem statement, all variables and given/known data

    What is the acceleration of a rising hot-air balloon if the ratio of the air density outside the balloon to that inside is 1.30? Neglect the mass of the balloon fabric and the basket.

    2. Relevant equations
    g=9.81 m/s^s

    3. The attempt at a solution

    I thought it would just be 1.3 times g=
    1.3(9.81)=12.75 m/s

    my hw says it is wrong...why?
  2. jcsd
  3. Nov 27, 2008 #2
    if the ratio was 1:1 the acceleration would be 9.81m/s^2 downwards. So how much lighter is the air in the balloon actually?
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