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If someone can help me with the correct equation to use, I would be gratly obliged!

  1. Nov 18, 2009 #1
    A 2.0 kg, 1.0 m long rigistic plastic rod is spinning about its center of mas at 2.1 rad/s. What is the magnitude of torque that will bring the rod to a halt in 5.0 s?

    A.) 0.07 N*m
    B.) 0.13 N*m
    C.) 0.21 N*m

    If you could help me set up the proper equation to use, I would greatly appreciate this.
     
  2. jcsd
  3. Nov 18, 2009 #2

    rl.bhat

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    Re: If someone can help me with the correct equation to use, I would be gratly oblige

    If ωi is initial angular velocity. ωf is the final angular velocity and α is the angular acceleration then
    ωf = ωi + α*t.
    From the given values find α.
    Torque = Ια.
     
  4. Nov 18, 2009 #3
    Re: If someone can help me with the correct equation to use, I would be gratly oblige

    Thanks Brotha!!!!!:bugeye:
     
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