JEE Main Physics question
A long horizontal rod has a bead which can slide along its length, and is initially placed at a distance from one end of the rod. The rod is set in angular motion about with constant angular acceleration . If the coefficient of friction between the rod and the bead is , and gravity is neglected, then the time after which the bead starts slipping is [IIT JEE Screening 2000]
Answer: (A)
Solution
The rod can only push the bead perpendicular to its length (normal force ), which supplies the tangential acceleration , so . The maximum static friction must supply the required
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