See the reply to the question above this one from "Jen". Find the mass and m*g, the center of mass, and how far you lift the center of mass.
In all these questions if you lower the outlet with a tight outlet hose you can siphon the water out without doing any work at all :) However to play along assume you lift the water 2 meters above the tank top.
An inverted conical tank is 3m tall and 1m in diameter at its widest point. The water
is being pumped out of a spout 2m above the top of the tank. Recall that the density
of water is � = 1000kg/m^3
(a) Find the work needed to empty the tank if it is full. Include units.
(b) Find the work to empty half the tank (assuming it is full to begin with).
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