On the surface of a liquid of density ρ floats a cylindrical thin-walled glass,
half submerged in the liquid.
a. How much will the glass sink into the liquid if it is placed upside down on
the surface of the liquid? The height of the glass is h, the air pressure is P .
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b. To what depth do you need to submerge the upside-down glass so that it,
together with the air contained in it, goes to the bottom?