Asealed tank containing seawater to a height of 12.8 m also contains air above the water at a gauge pressure of 2.90 atm . water flows out from the bottom through a small hole.

Suppose that a cylindrical tank 6 meters high with a radius of 2 meters is filled to the rim with water. the tank is buried so that the top of the tank is 1 meter below ground level. the space above the tank is not filled with water. calculate how much work needs to be done by a pump to pump the water out of the tank up to ground level. (the water weighs 9,800 newtons per cubic meter.)