An electric fan has blades of length 30cm as measured from the axis of rotation. If the fan is rotating at 1200 r.p.m. The acceleration of a point on the tip of the blade is about:
Correct answer: B. 4740m/sec2
- A. 1600m/sec2
- B. 4740m/sec2
- C. 2370m/sec2
- D. 5055m/sec2
Explanation
The correct answer is option B. This option accurately calculates the acceleration of a point on the tip of the blade as approximately 4740 meters per second squared. n = 1200 r.p.m.= 1200/60 r.p.s. = 20 r.p.s.a = ω²r = (4π²n²) r= 4 × (3.142)² × (20)² × 0.3≈ 4740 m/s²
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