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A circular plate of 0.61 m diameter is situated in the vertical side of a water...

A circular plate of 0.61 m diameter is situated in the vertical side of a water tank with its centre1.22 m below the level of the free surface. If the plate is hinged about the horizontal diameter, what force must be applied at the top point to just hold it still? To what depth must the hinge axis be lowered to reduce the closing force to zero?

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