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A spherically shaped balloon has a radius of 10.5 m, and is filled with helium. How...

A spherically shaped balloon has a radius of 10.5 m, and is filled with helium. How much extra mass can a cargo lift, assuming that the skin and the cargo of the balloon have a mass of 1200 kg? Neglect the buoyant force on the cargo volume itself.(The density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3).

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