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A circular cylinder of height h0 = 10 cm and radius r0 = 2cm is opened at the top and filled with liquid.

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A circular cylinder of height h0 = 10 cm and radius r0 = 2cm is opened at the top and filled with liquid. It is rotated about its vertical axis. Determine the speed of rotation so that half the area of the bottom gets exposed. (g = 10 m/sec2).

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Area of bottom = πr02

If r is radius of the exposed bottom, then

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