Posted by april on Monday, December 20, 2010 at 3:24pm.
nevermind. got it.
Tension = Bouyancy force - ballon weight - helium weight.
= [V(air density - helium density) + ballon mass)]*g
V = (4/3) pi R^3
g = 9.8 m/s^2
By multiplying by g, you get the answer in Newtons, which is probably what they want.
For the air density, which you need, they should have told you what Temperature and pressure to assume. Use the STP value.
good
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