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Q.

A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, work required to pull the hanging part on to the table is

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a

MgL

b

MgL3

c

mgL9

d

mgL18

answer is D.

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Detailed Solution

The weight of hanging part (L3) from the table.As work done = force ×distanceW = Mg3×L6 = MgL18
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A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, work required to pull the hanging part on to the table is