You accidentally lose your Helium-filled balloon which floats to the ceiling. The balloon is initially inflated to a radius of 6 inches (assume a sphere). The balloon’s empty mass is 10 g. The density of the rubber is 0.8 g/cm3.

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Question

You accidentally lose your Helium-filled balloon which floats to the ceiling. The balloon is initially inflated to a radius of 6 inches (assume a sphere).
The balloon’s empty mass is 10 g. The density of the rubber is 0.8 g/cm3.

Assuming the contents of the balloon are purely helium @ p=1 atm, T=300 K, how much less mass is in the He balloon than in an equivalent balloon full of air? What is the amount of lift generated by the He balloon?

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