A ventilation fan has blades 0.25 m long rotating at 20 rpm. What is the centripetal acceleration of a point on the outer tip of a blade?

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  1. 20rpm = 20 x 2π / 60
    =2.1 rad/s

    angular speed, ω=2.1 rad/s

    = 0.525m/s

    centripetal acceleration, ac = v2 /r
    = (0.525)2/(0.25)

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