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Newton's laws

  1. Oct 28, 2007 #1
    1. The problem statement, all variables and given/known data
    A balloon with an attached basket and a total mass of 1200 kg is hovering at an altitude of 500m. A bag containing 100kg of sand is emptied over the side of the basket. Find the upward acceleration of the balloon after the sand has been poured out.


    2. Relevant equations

    F=ma

    3. The attempt at a solution

    I have no clue how to start this equation or solve it! Please help!!!
     
  2. jcsd
  3. Oct 28, 2007 #2

    Kurdt

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    The balloon had enough upthrust to keep its own weight in equilibrium. When some of the mass is lost it still has the same upthrust. What then is the acceleration?
     
  4. Oct 28, 2007 #3
    9.8?
     
  5. Oct 28, 2007 #4

    Kurdt

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    What does this mean?

    The balloons weight is balanced by the upthrust at first. Therefore the upthrust is equal in magnitude to the balloons weight. What is the balloons weight?
     
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