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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: - A capacitor is used to store 24 watt hour of energy at 1200 volt.
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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
- A capacitor is used to store 24 watt hour of energy at 1200 volt.
- Carbon,silicon and germanium have four valence electrons each. At room temperature
- The induced emf in a coil of 10 H inductance in which current varies
- A person can see clearly objects only when they lie between 50 cm and 400 cm from
- The cylindrical tube of a spray pump has radius R, one end of which has n fine holes,
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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