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

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