A helium balloon is to lift a payload to an altitude of 40 km, where the atmospheric pressure and temperature are 3.0 mbar and -25^∘ C, respectively. The balloon skin is polyester with specific gravity of 1.28 and thickness of 0.015 mm . To maintain a spherical shape, the balloon is pressurized to a gage pressure of 0.45 mbar. Determine the maximum balloon diameter if the allowable tensile stress in the skin is limited to 62 MN / m^2. What payload can be carried? | Numerade

How many cubic meters of helium are required to lift a balloon with a 400-kg payload to a height of 8000 m ? (Take ρHe=0.180 kg / m^3 . ) Assume that the balloon maintains a constant volume and that the density of air decreases with the altitude z according to the expression ρ air =ρ0 e^-z / 8 000 where z is in meters and ρ0=1.25 kg / m^3 is the density of air at sea level. | Numerade

SOLVED: 5) What volume of helium is needed if helium balloon is to lift load of 180 kg (including the weight of the empty balloon)

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