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Two discs of same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio
Options
(a) 1 : 81
(b) 1 : 27
(c) 1 : 9
(d) 1 : 3
Correct Answer:
1 : 81
Explanation:
I = (1/2) MR² = (1/2) (πR²t ρ) R² = πtρR⁴ / 2
t and p are same
I₁/I₂ = [R₁/R₂]⁴ = [0.2 / 0.6]⁴ = 1 / 81.
Related Questions: - A copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions
- If the binding energy of the nucleon in ₃⁷Li and ₂⁴He nuclei are 5.60 MeV and 7.06 MeV
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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 copper disc of radius 0.1 m is rotated about its centre, with 10 revolutions
- If the binding energy of the nucleon in ₃⁷Li and ₂⁴He nuclei are 5.60 MeV and 7.06 MeV
- The time period of a mass suspended from a spring is T. If the spring is cut into four
- A straight conductor 0.1 m long moves in a uniform magnetic field 0.1 T.
- An electric dipole of length 1 cm is placed with the axis making an angle of 30⁰
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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