The Earth rotates once about its axis in 24 hours. What is its angular speed?
Correct answer C. 7.27 × 10⁻⁵ rad/s
Explanation
ω = 2π/T = 2π/(24 × 3600 s) = 2π/86 400 = 7.27 × 10⁻⁵ rad/s. Using T in hours gives 0.26 rad/h, not rad/s.
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