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An expansible balloon filled with air fl...

An expansible balloon filled with air floats on the surface of a lake with `2//3` of its volume submerged. How deep must it be sunk in the water so that it is just in equilibrium neither sinking further nor rising? Is is assumed that the temperature of the water is constant `&` that the height of the water barometer is `9` meters.

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An expansible balloon filled with air is floating on the top surface of a lake, with 2//3 of its volume is submerged in water. How deep should it be sunk in water without changing the temperature of air in it, in order that it is just in equilibrium, neither sinking nor rising further? Height of water barometer = 10 m .

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