In the flat vertical wall of the tank filled with water

In the flat vertical wall of the tank filled with water, there is a rectangular hole of height a and width b, which is overlapped by the semicylindrical cover ABC (Fig. 1). The top edge of this hole is at a depth H below the water level in the tank.
Determine the magnitude and line of action of the force of excess hydrostatic pressure acting on the cylindrical surface of the cover ABC.
Given: R = 1.0m; b = 2.0m; H = 3.0m
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