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Angular acceleration of rod using relative accelerations

  1. Dec 3, 2007 #1
    1. The problem statement, all variables and given/known data
    A collar at point B slides on a 4 kg uniform rod CD. Knowing that in the position shown, crank AB rotates with an angular velocity of 5 rad/s and an angular acceleration of 60 rad/s^2, both clockwise, determine the force exerted on rod CD by collar B.

    2. Relevant equations
    relative velocities
    relative accelerations
    mass moment of inertia for a bar

    3. The attempt at a solution
    The question here is that I'm confused on how this other site got the angular velocity of CD. I figured it out to be -5 rad/s. Is there anything that I'm doing wrong? I understand how they got it their way, but I would like to use the method of relative velocities and accelerations.
    Here is what they had. The first post is me asking them how they got it, still no response.

    Here's is my attempted work...
  2. jcsd
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