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Homework Help: Helium balloon

  1. Mar 29, 2007 #1
    1. The problem statement, all variables and given/known data

    balloons are required to lift 20 metric tons. the pressure of helium is 101.325kpa. temp=21.1degcelsius.

    what should be the diameter of the balloon if it was spherical in shape in order to lift the weight?

    2. Relevant equations

    bouyant force??

    3. The attempt at a solution


  2. jcsd
  3. Mar 29, 2007 #2


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    Staff: Mentor

    You need to show more work in order for us to help you. Tell us more about bouyant forces. What causes them? If you have an object that normally floats in water, and you hold it under water, how do you calculate the upward force that you feel from the object?
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