JEE Main 2022 Physics question
A disc with a flat small bottom beaker placed on it at a distance R from its center is revolving about an axis passing through the center and perpendicular to its plane with an angular velocity . The coefficient of static friction between the bottom of the beaker and the surface of the disc is . The beaker will revolve with the disc if :
Answer: (2)
Solution
To move together, the friction must supply the centripetal force: , i.e. .