This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the part. A heavy rope, 50 ft long, weighs 0.8 Ib/ft and hangs over the edge of a building 140 ft high. Approximate the required work by a Riemann sum, then express the work as an integral and evaluate it. Exercise (a) How much work W is done in pulling the rope to the top of the building? Step 1 Since the rope weighs 0.8 Ib/ft, the portion of the rope below the top of the building from x ft to (x + Ax) ft weighs Axlb. Submit Skip (you cannot come back) Exercise (b) How much work W is done in pulling half the rope to the top of the building?

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