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Two discs A and B are mounted coaxially ...

Two discs `A` and `B` are mounted coaxially ona vertical axle. The discs have moments of inertia `l` and `2l` respectively about the common axis. Disc A is imparted an initial angular velocity `2 omega` using the centre potential energy of a spring compressed by a distance `x_(1)`. Disc `B` is imparted angular velocity `omega` by a spring having the same spring constant and compressed by a distance `x_(2)`. Both the disc rotate in the clockwise direction.
When disc `B` is brought in contact with disc `A`, they acquirea common angularvelocity in time `t`. The average frictional torque on one disc by the other during this period is -

A

`(2lomega)/(3t)`

B

`(9lomega)/(2t)`

C

`(9lomega)/(4t)`

D

`(3lomega)/(2t)`

Text Solution

Verified by Experts

The correct Answer is:
a
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