Determine the hydrostatic pressure force, FR $=$

$$hcA$,$ on the vertical end of the block for a given

water depth, h$.$ Also determine the point of action of this force, a distance yR $$ yc below the

centroid of the area. Note that the equations for FR and yR $$ yc are different when the water level

is below the end of the block $($h $<$ R$2$ R$1)($partially submerged, ps$)$ than when it is above the

end of the block $($h $>$ R$1$ R$2)($fully submerged, fs$)$