CUET Preparation Today
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 : |
\(r \geq \frac{\mu g}{\omega^2}\) \(r = \mu g \omega^2\) \(r < \frac{\omega^2}{\mu g}\) \(r \geq \frac{\mu g}{\omega^2}\) |
\(r \geq \frac{\mu g}{\omega^2}\) |
\(\mu g \omega^2 \geq mr\omega^2\) ⇒ \(r \geq \frac{\mu g}{\omega^2}\) |
