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**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 = U**

_{i}- U_{f}; Total energy = U + K ; F(x) = -dU/dx**3. I can't figure out how to set up the integral..**