Hello all, I have banged my head about this one. If anyone can help that would be great.

"Consider a cyclindrical tank lying horizontally. Each end is a circle of radius 3 feet. The tank is 12 feet long. It is full of oil which weighs 60 lbs/ft3"

a)Set up Reiman Sum whose limit will compute the amount of force on each end.

b) Set up Reiman Sum whose limit will compute the amount of work done in pumping the oil out to the top of the tank.