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Question 30354
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Rigid Body Dynamics: Kinematic Equations — Rotational MCQ

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Kinematic Equations — RotationalEasyQuestion 30354

Question

A wheel starts from rest and reaches 120 rpm in 4 s (uniform acceleration). The angular acceleration is:
  1. A
    π rad/s²
    Correct
  2. B
    2π rad/s²
  3. C
    4π rad/s²
  4. D
    π/2 rad/s²

Correct answer

π rad/s²

Explanation

120 rpm = 120×2π/60 = 4π rad/s. α = (ω − ω₀)/t = (4π − 0)/4 = π rad/s².

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