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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 ball is dropped into a well in which the water level is at a depth h below the top
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- When the disc rotates with uniform angulr velocity.Which of the following is not true?
- A certain number of spherical dropes of a liquid of radius r coalesce to form a single
- An electron is moving in a circular path under the influence of a transverse 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
- A ball is dropped into a well in which the water level is at a depth h below the top
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- When the disc rotates with uniform angulr velocity.Which of the following is not true?
- A certain number of spherical dropes of a liquid of radius r coalesce to form a single
- An electron is moving in a circular path under the influence of a transverse 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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