Bob has a tree house at a height of 20 ft. when he's feeling adventurous he uses a rope to climb the tree house instead of the ladder. if the weight of the rope is 32 lb, then how much work must bob do to pull the rope up once he has entered the house?

The solution to the problem is as follows:

Centre of mass of rope is 10 ft from tree house. so Bob is lifting the Center of mass of rope by 10ft. So work done = 32 lb * 10 ft = 320 ft-lb 

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