A thin circular ring of mass M and radius R is rotating in a horizontal plane about

⇦

⇨

A thin circular ring of mass M and radius R is rotating in a horizontal plane about an axis vertical to its plane with a constant angular velocity ?. If two objects each of mass m be attached gently to the opposite ends of a diameter of the ring, the ring will then rotate with an angular velocity:

Options

(a) ?M / M + 2m
(b) ? (M + 2m) / M
(c) ?M / M + m
(d) ? (M – 2m) / M + 2m

Correct Answer:

?M / M + 2m

Explanation:

In abstance of external torque, L = I? = constant
I₁?￢ﾂﾁ = I₂?￢ﾂﾂ,I₁ = MR²,I₂ = MR² + 2mR²
(Moment of inertia of a thin ciruclar ring about axis vertical to its plane = MR²)
?￢ﾂﾂ = I₁ / I₂ ⇒ ? = ?M / M + 2m

Related Questions:

1. An astronomical telescope arranged for normal adjustment has a magnification of 6.
2. A car moving with a speed of 50 kmh⁻¹ can be stopped by brakes after at least 6 m
3. In which of the processes, does the internal energy of the system remain constant?
4. A straight conductor of length 0.4 m is moved with a speed of 7 ms⁻¹perpendicular
5. Rate of photoelectric emission is proportional to

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

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends