1. The problem statement, all variables and given/known data A tank is full of water. Find the work W required to pump the water out of the spout. Use the fact that water weighs 62.5 lb/ft3. a = 5 b = 9 c = 12 3. The attempt at a solution So for this one, you have to set up a formula for a rectangular box of water. The biggest rectangle is 5(or y) by 9, in relation to a smaller rectangle that is w by 9. I can also setup a relationship between the two to find that y/w=9/9 or y=w. So therefore we can produce an equation for the area of one rectangle. dA=9y Now the thickness of this rectangle is extremely small so the thickness is dy. dV=9y dy The density of water is 62.5 lb/ft^3, so this one rectangular-box of water is: dM=562.5y dy To find the force, we multiply by the force of gravity, I used 32.2 ft/sec^2. dF=18112.5y dy So our work is dF times the distance. This is where I become lost. Would the distance be vertical or horizontal? would it be (5-y) or (12-y)? Sorry to bother you guys again! :yuck: Thanks for all of the help so far!