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Help with the non uniform circular motion ?

  1. Nov 10, 2011 #1
    I am given the moment of inertia of the system ( a fan) and the question asks for me to find the angular acceleration "after the fan is turned on, it takes t = 3.6 s and a total of 12 revolutions to accelerate up to its full speed" ? How I went about solving is that.. I simply converted the rev / sec into rad/ sec (20.94rads/sec). And used this as a final angular velocity, 0 as the initial velocity and the time (3.6) to calculate the acceleration, but I dont get the right answer and I don't know why ?

    thanks
     
  2. jcsd
  3. Nov 10, 2011 #2
    I would apply the following:

    θ = [itex]θ_{o}[/itex] + [itex]\omega_{o}[/itex]t + [itex]\frac{1}{2}[/itex][itex]\alpha[/itex][itex]t^{2}[/itex]

    Your physics book should discuss this.

    Let me know it it works!
     
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