An expansible balloon filled with air floats on the surface of a lake with \( 2 / 3 \) of its vo...

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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
\( \mathrm{P} \) further nor rising ? It is assumed that the temperature of the water is constant \& that the height

W. of the water barometer is 9 meters.
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