A rectangular plan surface 5 m wide and 7 m deep lies in water in such a way that its plane makes an angle 60⁰ with the free surface of water. Determine the total pressure force when the upper edge is 3 m below the free surface.
(a) 311.15 N/cm^2
(b) 622.3 N/cm^2
(c) 155.5 N/cm^2
(d) None of the mentioned
I had been asked this question during an online interview.
Question is from Horizontal and Inclined Plane Surface Submerged in a Liquid topic in section Hydrostatic Forces on Surfaces of Fluid Mechanics