6. A circular cone tank of height 12 it is inserted into the ground with its vertex pointing down. Its top, at ground level, has a radius of 3 Ft. The tank is lled with water to a depth of 5 ft. [Assume the densityr ofwater is p = 62.5 lbetEJ J A a] 1Ill'rite an algebraic expression for the work done in pumping a single crosssection of the water to ground level. b] How much work is performed in pumping all the water to ground level? e] How much work is performed in pumping the mter to a height 3 ft above ground level