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?
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