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A gramophone record is revolving with an angular velocity ?. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is µ. The coin will resolve with the record if:
Options
(a) r = µ g ?ￂﾲ
(b) r < ?ￂﾲ / µ g
(c) r <= µ g / ?ￂﾲ
(d) r >= µ g / ?ￂﾲ
Correct Answer:
r <= µ g / ?ￂﾲ
Explanation:
For the coin to revolve with the record, centrifugal force <= frictional force mr ?ￂﾲ <= µ mg r <= µg / ?ￂﾲ
Related Questions: - The phase difference between the flux linked with a coil rotating in a uniform
- A certain number of spherical dropes of a liquid of radius r coalesce to form a single
- Imagine a new planet having the same density as that of earth but it is 3 times bigger
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Topics: Motion of system of Particles and Rigid Body
(73)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The phase difference between the flux linked with a coil rotating in a uniform
- A certain number of spherical dropes of a liquid of radius r coalesce to form a single
- Imagine a new planet having the same density as that of earth but it is 3 times bigger
- Two closed pipes produce 10 beats per second when emitting their fundamental nodes.
- The rms current in an AC circuit is 2 A. If the wattless current be √3 A,
Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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