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Q.

A uniform chain of mass m and length l hangs and touches the surface of a table by it’s lower end. Find the force exerted by the table on the chain when half of it’s length has fallen off the table. The fallen part does not form a heap

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a

mg

b

3mg

c

23mg

d

32mg

answer is A.

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Detailed Solution

F=W+Ft ; W=mg2 ; Ft=(ml)(2g×l2)2=mg

∴F=mg2+mg=32mg

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