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 ≤
Create a free account to view solution
View Solution FreeMore Circular Motion Questions
A coin placed on a rotating turntable just slips if it is placed at a distance of 16 cm from the centre. If the angular ...A particle of mass m is suspended from a fixed point O by a string of length l. It is displaced by angle θ (θ ...A particle is kept fixed on a uniformly rotating turn-table As seen from the ground , the particle goes in a circle, its...Let $\overrightarrow{v}$ (t) be the velocity of a particle at time t. Then :...On horizontal smooth surface a mass of 2 kg is whirled in a horizontal circle by means of a string at an initial angular...