1. The problem statement, all variables and given/known data A well is dug in the shape of a rectangular prism. It is 30ft deep and has a base with area of 40ft^2. Assuming that the soil weighs 150 lbs/ft^3, calculate the work W required to raise the soil to ground level. 2. Relevant equations W = ∫dW dW = ρ(area)(distance)dx 3. The attempt at a solution I had dW = ρ40(30-x)dx Then I said W = 150∫[from 0 to 30] 1200-40x dx Solved to get 2700000ft/lb, which is wrong. I don't really understand what I did wrong here. Isn't this just like pumping water out of a tank or something?