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Homework Help: Kinematics using vector analysis

  1. Dec 6, 2014 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations

    Va = Vb + Va/b
    Va = Vb + (wab x ra/b)

    3. The attempt at a solution

    OK so here is part of my solution:


    My velocity for B is correct according to the book. But I'm confused about D. The only problem here is that the velocity of D only has an i component, no j component. How do we know that and why is that? Also, how come the velocity of D isn't zero since it's a fixed point?
  2. jcsd
  3. Dec 7, 2014 #2

    Stephen Tashi

    User Avatar
    Science Advisor

    Why do you think that D is a fixed point? At the time shown, D is at the end of CD and must move along the circle with center C since CD pivots about C. At the time shown, CD is vertical so the tangent vector to the circle is horizontal at that time.
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