Semi - vertical angle of the conical sec...

Semi - vertical angle of the conical section of a funnel is `37^@`. There is a small ball kept inside the funnel. On rotating the funnel, the maximum speed that the ball can have in order to remain in the funnel is 2 m/s. Calculate inner radius of the brim of the funnel . Is there any limit upon the frequency of rotation ? How much is it ? Is it lower or upper limit ? Given a logical reasoning. (Use g = 10 m/s^2 and sin `37^@` =0.6)`

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