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If A is the area of the surface, x is the depth of its C.G. from the surface of the water and ω is the density of water, then

total pressure on the surface is equal to ω x
depth of the point at which total pressure acts is equal to its moment of inertia divided by A x
depth of the centre of pressure is 2/3H vertically below the surface
all the above.

Correct Answer: all the above.

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