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A closed vertical cylinder 400 mm diameter and 500 mm high is filled with the oil of relative density = 0.85 to a depth

A closed vertical cylinder 400 mm diameter and 500 mm high is filled with the oil of relative density = 0.85 to a depth of 350 mm. The remaining volume contains air at atmospheric pressure. The cylinder revolves about a vertical axis at such speed that oil just begins to uncover the base. Calculate the speed of rotation (RPM) for this condition.

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