Question

A coin placed on a rotating turntable just left it is at a distance of 40 cm from the centre if its angular

Answer 1

Answer:

(w= angular velocity)

F= m w^2 r

F slip= m w^2 40. --> eqn(1)

F slip= m (2w)^2 R2

F slip=4m w^2 R2 --> eqn(2)

solving 1 and 2

m w^2 40 = 4 m w^2 R2

so R2 = 10 cm