A chain 64 meters long whose mass is 20 kilograms is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the top 3 meters of the chain to the top of the building? Use that the acceleration due to gravity is 9.8 meters per second squared. Your answer must include the correct units.
A chain 64 meters long whose mass is 20 kilograms is hanging over the edge of a tall building...
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calculus
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2More appropriate for physics.SE? Anyway a simple difference of potential should give the answer. – 2012-09-29
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1This is a common sort of problem in a calculus course on integral applications, so it doesn't seem out of place to me. – 2012-09-29
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0The below answer is NOT right. Can anyone else help me? – 2012-09-29
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1Is all the 64 meters hanging over? It makes no sense how it is worded. If you list the top 3 meters you are just lifting the end of the chain. Also, are you pulling the entire chain up or just the end up? (they are different problems) – 2012-09-29
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1If the chain is uniform (mass is uniformly distributed), and is at rest at the beginning and the end of the operation, and there is no friction, then a simple computation of the potential energy before and after will do the trick, not forgetting the 3m at the top of the tower at the end. – 2012-09-29