Motion in a Plane - Result Question 60

63. An electric fan has blades of length 30cm measured from the axis of rotation. If the fan is rotating at 120rpm, the acceleration of a point on the tip of the blade is

(a) 1600ms2

(b) 47.4ms2

(c) 23.7ms2

(d) 50.55ms2

[1990]

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Solution:

  1. (c) Centripetal acc. =ω2r=4π2v2r

=4×(3.14)2×12060×30100=23.7ms2[ω=2πν]



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