A helium-filled spherical balloon (whose mass, when empty, is 300 g) has a 0.90 m radius at liftoff where air pressure is 1.0 atm and the temperature is 25 degrees C. When balloon expands, the helium temperature is 210 K, and pressure drops to 0.019 atm. What is the weight of a load that needs to be attached to the balloon to keep it at the verge of lifting? (air density is 1.225 kg/m3, and helium density is 0.179 kg/m3)
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A helium-filled spherical balloon (whose mass, when empty, is 300 g) has a 0.90 m radius at liftoff...
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