On the small piston with area s = 25 cm² at a hydraulic press se
press with force f = 10N. Knowing that the big piston of the press raises a body with
mass of 100 kg, find the area (S) of the large piston of the hydraulic press.
Give g = 10 N / kg.

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.)