A tank is full of water. Find the work required to pump the water out of the spout. Use the fact that water weighs 62.5 lb/ft3. (Assume r = 4 ft, R = 8 ft, and h = 15 ft.)

Answer 1

v = pi r^2 h
the center of mass is at h=15/2
so the work required is volume * density * 62.5 * 15/2