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Q.

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

3mg4

b

mg2

c

3mg2

d

mg

answer is C.

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Detailed Solution

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FT=λV2=mL(2×g12)2

FT=mg

FNet=mg+mg2=3mg2

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