A gramophone record is revolving with an angular velocity ω . A coin is placed at a…
Physics · JEE Advanced · NTA Exams — Rotational Motion
A gramophone record is revolving with an angular velocity ω . A coin is placed at a distance r from the centre of the record. The static coefficient of friction is µ. The coin will revolve with the record if-
- r > µg ω2
- r = µg /ω2 only
- r < µg /ω2 only
- r ≤ µg /ω2
Answer
(D) r ≤ µ g / ω 2
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