Suppose a vertical flat plate supports water on one side and oil of specific gravity 0.86...

Suppose a vertical flat plate supports water on one side and oil of specific gravity 0.86 on the other side, as shown in Figure P3.6.4. How deep should the oil be so that there is no net horizontal force on the plate? Calculate the moments of the pressure forces about the base of the plate. Are the magnitudes of the moments equal? Why?

Figure P3.6.4 Vertical flat plate for problem 3.6.4.