The water depth at the center of the elliptical window is 20 ft. Determine the magnitude o...

The water depth at the center of the elliptical window is 20 ft. Determine the magnitude of the net moment exerted on the window about the horizontal axis L by the pressure of the seawater (γ = 64 lb/ft3) and the atmospheric pressure of the air on the opposite side. (See Problem 10.89.)