Angular Momentum
A disc of mass 2 kg and radius 0.5 m rotates at 10 rad/s. What is its angular momentum?
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About This Question
- Subject
- physics
- Chapter
- rotational motion
- Topic
- angular momentum
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
2.5 kg·m²/s
- Moment of Inertia (I): For a solid disc, I=21MR2.
- I=21×2×(0.5)2=0.25 kg·m2.
- Angular Momentum (L): L=Iω.
- Substitute Values:
- L=0.25×10 rad/s.
- Result: L=2.5 kg·m2/s.
- Analogue: Angular momentum is the rotational equivalent of linear momentum p=mv.
This medium difficulty physics question is from the chapter rotational motion, covering the topic of angular momentum. It appeared in the 2025 exam.
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