Angular Acceleration
Easyphysics
A wheel starting from rest attains an angular velocity of 20 rad/s in 4 seconds. What is the angular acceleration?
Select the correct option:
Solution
Incorrect! Answer:
5 rad/s²
- Definition: Angular acceleration (α) is the rate of change of angular velocity.
- Formula: α=tωf−ωi.
- Identify Data:
- Initial velocity ωi=0.
- Final velocity ωf=20 rad/s.
- Time t=4 s.
- Calculation: α=20/4=5 rad/s2.
- Result: The wheel accelerates at 5 rad/s2.
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About This Question
- Subject
- physics
- Chapter
- rotational motion
- Topic
- angular acceleration
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
5 rad/s²
- Definition: Angular acceleration (α) is the rate of change of angular velocity.
- Formula: α=tωf−ωi.
- Identify Data:
- Initial velocity ωi=0.
- Final velocity ωf=20 rad/s.
- Time t=4 s.
- Calculation: α=20/4=5 rad/s2.
- Result: The wheel accelerates at 5 rad/s2.
This easy difficulty physics question is from the chapter rotational motion, covering the topic of angular acceleration. It appeared in the 2025 exam.
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