Задача id9556

Determine the minimum volume of a hydrogen-filled balloon that can lift a person with mass m1 = 70 kg to a height h = 100 m in time t = 30 s. The total mass of the shell of the ball and the basket is m2 = 20 kg, the density of air and hydrogen is taken equal to p1 = 1.3 kg/m3 and p2 = 0.10 kg/m3, respectively. Neglect air resistance.

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