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A 30 foot long chain weighing 90 pounds hangs over the edge of a 40-ft tall...

A 30 foot long chain weighing 90 pounds hangs over the edge of a 40-ft tall building.         Compute the work necessary to hoist it up the side of the building to the top. (You must          draw a model of the problem and identify all elements of the integral used to perform the calculation as they pertain to the physical problem to receive full credit).

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