# Work Done lifting a chain

1. Oct 13, 2007

### fubag

How much work is done lifting a 25-ft chain over the side of a building? Assume that the chain has a density of 4 lb/ft. Hint: Break up the chain into N segments, estimate the work performed on a segment, and compute the limit as N approaches infinity as an integral.

(The small segment of the chain of length delta y located y feet from the top is lefted through a vertical distance y.)

Force = g*density*volume...?

whats the volume of a segment of the chain, im having difficulty.