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

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Correct answer: B. (b) Frequency of rotationv=1 2 0 rpm =2 rps length of blade r=3 0 cm =0.3 m Centripetal acceleration a=ω^2r=(2 π u)^2r =4 π^2v^2r=4 π^2(2)^2_(0.3_)=4 7.4 m s^−2

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

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