Exam-style question
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A satellite orbits the Earth with a period of 90 minutes. What is its angular speed in radians per second?.
- A.0.116 rad/s
- B.0.069 rad/s
- C.0.104 rad/s
- D.0.087 rad/s
Model answer
What a good answer should say
- 0.116 rad/s
Explanation
Why this works
The formula for angular speed is ω = 2π / T. First, convert 90 minutes to seconds: 90 min * 60 s/min = 5400 s.
Then, ω = 2π / 5400 s ≈ 0.116 rad/s. Therefore, the angular speed is 0.116 rad/s.
Common mistake
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