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If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly lower his hands, then
Options
(a) The angular velocity decreases
(b) His moment of inertia decreases
(c) The angular velocity stays constant
(d) The angular momentum increases
Correct Answer:
The angular momentum increases
Explanation:
A gymnast sitting on a rotating stool with his arms outstretched. Suddenly when he lower his hands his moment of inertia I decreases. Since his angular momentum Iω remains constant and I decreases, his angular velocity ω increases.
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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 light emitting diode(LED) has a voltage drop of 2 volt across it
- The density of ice is 0.9 g/cc and that of sea water is 1.1 g/cc
- The specific charge of a proton is 9.6×10⁷ C/kg. The specific charge of an alpha particle
- IF A⃗ and B⃗ are two vectors and θ is the angle between them
- All components of the electromagnetic spectrum in vacuum have the same
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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The angular momentum increases because it depends on radius.Here when he lowers his hand the radius increases.