Ten seconds after an electric fan is turned on, the fan rotates at 300 rev/min. Its average angular acceleration is
Correct answer: C. 30 rev/s²
- A. 30 rad/s²
- B. 3.14 rad/s²
- C. 30 rev/s²
- D. 500 rev/s²
Explanation
Formula for average angular acceleration: As before, we use the formula:α = (ω₂ - ω₁)/(t₂ - t₁)Converting RPM to rad/s: 300 rev/min is equal to 300 x 2π/60 rev/s (approximately 50 rev/s).Plugging in values: Since the fan starts from rest (ω₁ = 0), we have:α = (50 - 0) / (10 - 0) = 50 / 10 = 5 rev/s²Therefore, the average angular acceleration is 5 re/s².
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