Question 2.22: A sloping plane with a width of 1 ft and a length of 3ft is ...

(a) The magnitude of the hydrostatic resultant force acting on the sloping plane is determined by applying Equation 2.111 F=pA as follows:

W:=1ft                     L:=3ft                     A:=w.L = 3ft^{2}
P_{g} :=8 \frac{lb}{in^{2} } \frac{(12in)^{2} }{(1in)^{2}} =1.152 \times 10^{3} \frac{Ib}{ft^{2} }                                 F:=P_{g}.A=3.456 \times 10^{3} lb

(b) The location of the resultant hydrostatic force acting on the sloping plane is located at the center of area of the sloping rectangular plane and is computed as follows:

y_{ca} :=\frac{L}{2} =1.5 ft                         y_{F}:=y_{ca}=1.5ft