A hot air balloonist wishes to operate at an altitude where the atmospheric air pressure is 14 psia and the temperature is 70 oFahrenheit. The balloon diameter is 50 ft (assume spherical shape), and the payload is 400 lb. (a) What mass in lbm of atmospheric air displaced by the balloon and (b) temperature expressed in oF must hot air in the balloon be to support the payload.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A hot air balloonist wishes to operate at an altitude where the atmospheric air pressure is 14 psia and the temperature is 70 oFahrenheit. The balloon diameter is 50 ft (assume spherical shape), and the payload is 400 lb. (a) What mass in lbm of atmospheric air displaced by the balloon and (b) temperature expressed in oF must hot air in the balloon be to support the payload. 

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