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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 block of mass M is attached to the lower end of a vertical spring
- The horizontal range and maximum height attained by a projectile are R and H,respectively
- A car of mass 1000 kg negotiates a banked curve of radius 90 m on a frictionless
- The internal energy change in a system that has absorbed 2 kcals of heat
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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 block of mass M is attached to the lower end of a vertical spring
- The horizontal range and maximum height attained by a projectile are R and H,respectively
- A car of mass 1000 kg negotiates a banked curve of radius 90 m on a frictionless
- The internal energy change in a system that has absorbed 2 kcals of heat
- In the experiment for determination of velocity of sound in air,
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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