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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

A uniform chain of length L and mass M overhangs a horizontal table with its two-thirds part on the table. The friction coefficient between the table and the chain is μ. The work done by friction during the period the chain slips off the table is

Answer: (B)

Solution

Let x be the length of chain hanging over the edge at a general instant, ranging from x = L/3 (initially) to x = L (fully off the table). The length still on the table is (L−x), so the normal force there is (M/L)(L−x)g and the

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Question ID VK-153718