Circular MotionHard
Question
A gramphone record is revolving with an angular velocity ω coin is placed at a distance r from the centre of the record. The static coefficient of friction is μ. The coin will revolve with the record if
Options
A.r = μgω2
B.r = < 
C.
D.
Solution
The coin will revolve with the record, if
Force of friction ≥ Centrifugal force
μmg = mrω2
or r ≤
Force of friction ≥ Centrifugal force
μmg = mrω2
or r ≤
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