Задача id10700

A steel conical valve with a diameter D and a height h serves to close a round hole, where it is lowered by 2/3 h (Fig.). The position of the free surface corresponds to the height H. Determine the force F required to open the valve if D = 0.5 h; H = 5 h; pst = 7.8•103 kg/m3; рв = 103 kg/m3; h = 0.5 m.

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