Q7.26Multiple choice
Two cylindrical hollow drums of radii R and 2R, and of a common height h, are rotating with angular velocities ω (anti-clockwise) and ω (clockwise), respectively. Their axes, fixed are parallel and in a horizontal plane separated by (3R + δ ) . They are now brought in contact (δ → 0) .
- (a)Show the frictional forces just after contact.
- (b)Identify forces and torques external to the system just after contact.
- (c)What would be the ratio of final angular velocities when friction ceases?