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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
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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
- Two charges placed in air repel each other by a force of 10⁻⁴ N. When oil is
- In which case positive work has to be done in seperating them?
- The work done in rotating a magnetic of magnetic moment 2 A-m² in
- The velocity of molecules of a gas at temperature 120 K is v. At what temperature
- The voltage of an a.c.supply varies with time (t) as V=120 sin 100 πt the maximum voltage
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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