Currently, recreational balloons are not filled with hydrogen or helium but with hot air; the pilot has a small propane burner to heat the air in the balloon. If the balloon is a sphere 20 m in diameter, and if the total weight of the balloon, pilot, passenger compartment, propane burner, propane tank, ropes, etc is 200 kg, what average temperature must the air in the balloon have to just barely lift the balloon
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Currently, recreational balloons are not filled with hydrogen or helium but with hot air; the pilot...
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