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A hot air balloon has a mass of 250 kg and carries two passengers whose average...

A hot air balloon has a mass of 250 kg and carries two passengers whose average weight is 84 Kg. The balloon, which has a diameter of 12 m, rises through atmospheric air which is at 20oC. Find the total buoyant force on the balloon. Atmospheric pressure is 100 kPa with gas constant = 8.13 kJ/kmol.K and molar mass of the air is 28.97 g/mol

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