Question: A spherical balloon is made from a material whose mass is 3 kg . The thickness of the material is negligible compared to the 1

A spherical balloon is made from a material whose mass is 3kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium at a temperature of 310K and just floats in the air, neither rising nor falling.

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