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Homework Help: Angular Velocity Vector

  1. Nov 15, 2006 #1
    The problem has a picture of a rod on a 3 dimensional coordinate system and gives the measurements.

    The rod rotates around the line joining each of the two endpoints with a constant angular velocity of 12 rad/s.

    The problem has you do things in steps, first finding the components in x, y, and z and then the unit vectors in x, y, and z - both simple to do. Next, it asks for the angular velocity vector of the rod??? It wants the answer in radians/seconds.

    The closest equations I can find to helping are v= w X r or w= derivative of theta / dt

    Thanks for any insight.
  2. jcsd
  3. Nov 15, 2006 #2


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    Homework Helper
    Gold Member

    Hi Louie, and welcome to PF.

    You know the magnitude of the angular velocity. To find the direction, remember that it's perpendicular to both the direction of v and r.
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