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Posted by on Thursday, December 3, 2009 at 6:38pm.

Hey can someone help me out? I only have 1 attempt left on this question and do not understand it at all!!!

A 3.5 kg balloon is filled with helium ( density = 0.179 kg/m^3).
If the balloon is a sphere with a radius of 5.2m , what is the maximum weight it can lift?

  • Physics - , Thursday, December 3, 2009 at 6:46pm

    What is the weight of the air it displaces (volumeair*density*g) minus the weight of the balloon (mg)?

  • Physics - , Thursday, December 3, 2009 at 6:53pm

    So volume of balloon 4/3*pi*r^3 *density of helium * g - ( 3.5 *9.81) ?

  • Physics - , Thursday, December 3, 2009 at 6:58pm

    yes.

  • Physics - , Thursday, December 3, 2009 at 7:01pm

    The answer of 999.9 N was one I already tried, and it was not correct :(

  • Physics - , Thursday, December 3, 2009 at 7:13pm

    oops. I should have given you more.
    The density in the first part is the density of air.

    volumeair*densityair*g
    then the weight of the balloon has to include the weight of the helium (which is apparently not in the 3.5kg)
    weightballoon=(3.5*g+volumehelium*densityhelium*g)
    now is should work.

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