A cylindrical water tank has height 8 m and radius 2 m.
a) If the tank is full o f water, how much work is required to pump the water to the level of the top of the tank and out of the tank?
b. How much work is required to pump the water out of the tank when it is half full of water?
2. A small dam is in the shape o f a semicircle with diameter 40 m (the diameter of the circle is the top of the dam). Assuming that the water level is at the top of the dam, find the total force on the face of the dam.