A gramphone record is revolving with an angular velocity omega. A coin is placed at a distance `r` from the centre of the record. The static coefficient of friction is mu. The coin will revolve with the record if.

Options

A. r `ge (mu g)/(omega^(2))`
B. r = `mu g omega^(2)`
C. `r lt (omega^(2))/( mu g)`
D. `r le (mu g)/( omega^(2)) `

Answer

D