NEET 2010 Physics question
A gramophone record is revolving with an angular velocity . A coin is placed at a distance from the centre of the record. The static coefficient of friction is . The coin will revolve with the record if
Answer: (3)
Solution
The coin moves in a circle of radius with the record only if static friction can supply the required centripetal force: (maximum static friction ). This gives (option 3): the coin must lie within this
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