A tank in the shape of a right circular cone is full of water. If the height of the tank is 15 feet and the radius of its top is 6 feet, find the work done in (a) pumping the water over the top edge of the tank, foot-pounds, and (b) pumping the water to a height 15 feet above the top of the tank, foot-pounds. 5 = 62.4 is the (weight) density of water in pounds per cubic foot