Atank containing oil is in the shape of a downward-pointing cone with its vertical axis perpendicular to ground level. assume that the height of the tank is h=10 feet the circular top of the tank has radius r=5 feet, and that the oil inside the tank weighs 57 pounds per cubic foot. how much work (w) does it take to pump oil from the tank to an outlet that is 1 foot above the top of the tank if, prior to pumping, there is only a half-tank of oil?