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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 spherical planet has a mass Mp and diameter Dp. A particle of mass
- If doubly ionised lithium atom is hydrogen like with atomic number 3, the wavelength
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- The body of mass m hangs at one end of a string of length l, the other end of which
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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 spherical planet has a mass Mp and diameter Dp. A particle of mass
- If doubly ionised lithium atom is hydrogen like with atomic number 3, the wavelength
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- The body of mass m hangs at one end of a string of length l, the other end of which
- Ohm’s law valid
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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