1.A chain on top of a table is stretched out in a straight line perpendicular to the table's edge with one fourth of its length L hanging over the side. How much work is required to pull the hanging section of the chain back into the table. (hint: divide the hanging part into segments of length dy) 2. W = Ui - Uf ; Total energy = U + K ; F(x) = -dU/dx 3. I can't figure out how to set up the integral..