A spherical balloon has a radius of 7.35 m and is filled with helium. How large a cargo can it liftf

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A spherical balloon has a radius of 7.35 m and is filled
with helium. How large a cargo can it lift, assuming that the
skin and structure of the balloon have a mass of 930 kg?
Neglect the buoyant force on the cargo volume itself
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Why do you use the density for air when calculating th bouyancy force caused by the helium????

DominicSolano-hjkw