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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: - When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ .
- The photoelectric threshold wevelength for potassium (work function being 2 eV) is
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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
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ .
- The photoelectric threshold wevelength for potassium (work function being 2 eV) is
- A body A experiences perfectly elastic collision with a stationary body B
- An α-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic
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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