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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
- An experiment takes 10 minutes to raise temperature of water from 0⁰C to 100⁰C
- A layer of colourless oil spreads on water surface. White light is incident on it
- A photon of energy 10.2 eV collide inelastically with hydrogen atom in ground state
- Two cells when connected in series are balanced on 8m on a potentiometer.
- An electric dipole of dipole moment p is placed in a uniform external electric field
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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