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Q.

Two discs A and B touch each other as shown in figure. A rope tightly wound on A is pulled down at 2 m/s2 . The friction force (in N) between A and B if slipping is absent is :-
 

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answer is 2.

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Detailed Solution

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α1R=α2.(2R)        ...(i)

α1R=2      ...(ii)

Also,  f(2R)=2×(2R)22α2

∴f=2N.

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