Conservation Of Angular Momentum
Figure skater pulls arms inward reducing I to half. ω becomes:
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More rotational motion Practice Questions
A figure skater spinning at 3 rad/s about a vertical axis pulls her outstretched arms inward, reduci...
A figure skater spinning at 3 rad/s about a vertical axis pulls her outstretched arms inward, reduci...
A skater decreases moment of inertia from 4 to 1 kg·m². Initial ω = 3 rad/s. Final ω?
A skater decreases moment of inertia from 4 to 1 kg·m². Initial ω = 3 rad/s. Final ω?
A figure skater with arms extended has a moment of inertia of 4 kg·m² and rotates at 2 rad/s. When s...
A figure skater with arms extended has a moment of inertia of 4 kg·m² and rotates at 2 rad/s. When s...
A thin circular ring of mass M and radius R has a moment of inertia MR² about its central axis perpe...
A thin circular ring of mass M and radius R has a moment of inertia MR² about its central axis perpe...
A uniform beam of weight 200 N and length 4 m rests horizontally on two supports placed at its two e...
A uniform beam of weight 200 N and length 4 m rests horizontally on two supports placed at its two e...
A point on the rim of a wheel of radius 0.50 m moves while the wheel rotates at a constant angular v...
A point on the rim of a wheel of radius 0.50 m moves while the wheel rotates at a constant angular v...
A bomb at rest in deep space suddenly explodes into several fragments that fly off in different dire...
A bomb at rest in deep space suddenly explodes into several fragments that fly off in different dire...
A constant torque of 5 N·m acts on a wheel and turns it through an angular displacement of 8 radians...
A constant torque of 5 N·m acts on a wheel and turns it through an angular displacement of 8 radians...
A solid sphere and a thin spherical shell have the same mass and the same radius and rotate about th...
A solid sphere and a thin spherical shell have the same mass and the same radius and rotate about th...
A child of negligible spin sits on a rotating stool that turns at 2 rad/s with moment of inertia 4 k...
A child of negligible spin sits on a rotating stool that turns at 2 rad/s with moment of inertia 4 k...
A solid cylinder is released from rest and rolls without slipping down an incline making an angle wh...
A solid cylinder is released from rest and rolls without slipping down an incline making an angle wh...
A force is applied to a particle whose position vector relative to the origin is given, and the forc...
A force is applied to a particle whose position vector relative to the origin is given, and the forc...
About This Question
- Subject
- physics
- Chapter
- rotational motion
- Topic
- conservation of angular momentum
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Double
According to the Law of Conservation of Angular Momentum, if the net external torque is zero: Linitial=Lfinal⟹I1ω1=I2ω2 Given:
- I2=21I1 Substituting: I1ω1=(21I1)ω2 ω2=2ω1 The angular speed doubles. This explains why skaters spin much faster when they pull their limbs toward their axis of rotation.
This medium difficulty physics question is from the chapter rotational motion, covering the topic of conservation of angular momentum. It appeared in the 2025 exam.
Looking for more practice? Explore all physics questions or browse rotational motion questions on RankGuru.