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13) A flexible chain of length L and mass M is slowlypulled at constant speed up over the edge of a tableby a force f parallel to the edge of the table. As-sume that there is no friction between the table andthe chain, calculate the workdone |
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Answer» Let us consider that the whole chain is initially hanging from the edge of the table. Then, the centre of mass is at a height of L/2 from the edge of the table.Now when, the whole chain is pulled back on the table the centre of mass rises a height L/2. Now the work done = increase in the potential energy of centre of mass = m× g× L/2Therefore,W= mgL/2 |
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