Question

a tank of base area 120cm by 80cm contains water to a depth of 50cm, if the base has a side outlet of diameter 16cm, what would be the required force to push the water through the base outlet?

Answer 1

The hydrostatic pressure at the base outlet

$$p=g\rho h\\ =\rm 9.8\: N/kg*1000\: kg/m^3*0.50\: m=4900\: Pa$$

The corresponding force

$$F=pA\\ =4900\:\rm Pa*3.14*(0.08\: m)^2=98.5\: \rm N$$