Question

calculate the hydrostatic force on one side of a circular plate with a radius of 2 meters, submerged vertically in a tank of water so that the top of the circle is tangent to the water surface.

Answer 1

this can be approached as a double integral in cylindrical coordinates.

circle radius 2. z = rho g (x + 2)

or you can stick to 2 coordinates and draw a disc like this


depends what you like.