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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: - Consider two particles of different masses. In which of the following situations
- A wire of length L metre carrying a current I ampere is bent in the form
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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
- Consider two particles of different masses. In which of the following situations
- A wire of length L metre carrying a current I ampere is bent in the form
- If h is Planck’s constant, the momentum of a photon of wavelength 0.01 Å is
- At 10⁰C the value of the density of a fixed mass of an ideal gas divided by its pressure
- In an NPN transistor the collector current is 24 mA. If 80% of the electrons
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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