MHT CET Physics question
A thin rod is placed co-axially within a thin hollow tube which lies on a smooth horizontal table. The rod having the same mass 'M' and length 'L' as that of tube is free to move within the tube. The system is given an angular velocity '' about a vertical axis from one of its ends. Considering negligible friction between surfaces, find the angular velocity of the rod as it just slips out of the tube
Answer: (B)
Solution
There is no external torque about the axis, so angular momentum is conserved: initially ; when the rod just slips out its centre is at , so $ =
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