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Homework Help: Please help a newbie Relative velocity

  1. Jun 2, 2008 #1
    1. The problem statement, all variables and given/known data

    http: // i110.photobucket .com/albums/n104/juanmedina/sombreroface1.jpg
    (to see the picture of the problem deleted the spaces in the link provide above. I'm not allowed to post pics because I don't have 15 post

    the wheel shown rolls without slipping on the horizontal surface. At the instant shown, the wheel has an angular velocity of 6 rad/s clockwise. Determine the angular velocity of both links at this instant.

    2. Relevant equations

    Vb= Va + Vb/a = Va + rb/aw et= Va + wk X rb/a (w is the angular velocity)

    3. The attempt at a solution

    You are supposed to come up with two equations at common point, then equate them and solve for the unknowns.

    I need Wbc, Wba, and Vc at point C

    So far I got:

    Vb= Vc + Wbc X rb/c

    rc/b= -10i + 3j
    Vb= Vbi
    Wbc= Wbck
    and Wbck X -10i + 3j= -3Wbci - 10Wbcj

    You can solve this problem by (instantaneous center of zero velocity) doing the problem this way I got Wbc=.57471rad/s, Wba=1.2rad/s, and Vc=6 but I think is wrong because I'm not getting the same answer.

    please help

    Last edited: Jun 2, 2008
  2. jcsd
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