An electric fan has blades of length 30 cm measured from the axis of rotation. If the fan rotates at 120 rev min⁻¹, the acceleration of a point on the tip of the blade is:
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An electric fan has blades of length 30 cm measured from the axis of rotation. If the fan rotates at 120 rev min⁻¹, the acceleration of a point on the tip of the blade is:

G1 Physics · Accepted Answer

Step 1: Radius r=0.30 m and frequency f=120/60=2 s⁻¹. Step 2: Angular speed ω=2πf=4π rad s⁻¹. Step 3: Centripetal acceleration a=ω²r=(4π)²×0.30=4π²×4×0.30≈47.4 m s⁻². Final answer: B.