Rotational Kinetic Energy
A flywheel of moment of inertia 4 kg·m² rotates at 5 rad/s. What is its rotational kinetic energy?
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About This Question
- Subject
- physics
- Chapter
- rotational motion
- Topic
- rotational kinetic energy
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
50 J
- Rotational Kinetic Energy Formula: Krot=21Iω2.
- Variables:
- I=4 kg·m2.
- ω=5 rad/s.
- Calculation:
- Krot=21×4×(5)2=2×25.
- Result: Krot=50 Joules.
- Significance: This is the energy stored in the rotating body, used in flywheels to smooth out power delivery.
This easy difficulty physics question is from the chapter rotational motion, covering the topic of rotational kinetic energy. It appeared in the 2025 exam.
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