Two discs A and B are mounted coaxiallay on a vertical axle. The discs have moments of inertia
Channel: Doubtnut
Date: 05/07/2020

Two discs A and B are mounted coaxiallay on a vertical axle. The discs have moments of inertia I and 2 I  respectively about the common axis. Disc A is imparted an initial angular velocity `2 omega` using the entire potential energy of a spring compressed by a distance `x_1` Disc B is imparted an angular velocity `omega` by a spring having  the same spring constant and compressed by a distance `x_2` Both the discs rotate in the clockwise direction.  When disc B is brought in contact with disc A, they acquire a common angular velocity in time t. The average frictional  torque on one disc by the other during this period is