A water Storage tank

Question

a water storeage tank was made by welding a hemispgere onto each of the two ends of a cylinder of radius r and height H meters respectively. the tank is supported upright on a metal structure in such a way that its lowest point is l meters above the ground. calculate the work done to fill up the tan kby pumping water from ground level. assume that 1 cubic centimeter of water wieghs 1 kilogram

Answer 1

W = (pi)r^2Hgi

W = mad (mass x acceleration x distance), so W=(pi)r^2h)9.8(I)

 

Volume of cylinder is (pi)r^2h

 

But actually I'd do, W=(pi)r^2h)9.8(I+h) and fill the tank from the top....otherwise the force require to fill from bottom would change as u fill the tank.....