Задача id12664

A block of height L and cross-section S1 floats in a cylindrical glass of water (Fig. 32). Using a thin knitting needle, the block is slowly lowered to the bottom of the glass. What kind of work was done? The cross section of the glass is S2 = 2S1, the initial height of the water in the glass is also L, the density of the block material is p = 0.5рв, where рв is the density of water.

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