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Homework Help: Rotation & Relative Motion Problem

  1. Nov 6, 2009 #1
    1. The problem statement, all variables and given/known data
    Problem B6

    Collar A slides along a horizontal rod that is rotating as shown in Figure Q.B6
    with an angular velocity of 5 rad/s in the anti-clockwise direction. At a distance
    of 200 mm from the axis of rotation of the rod, the collar has a velocity of 3 m/s
    and an acceleration of 2 m/s2, both relative to the rod, in outward direction.
    Determine the (absolute) velocity and acceleration of the collar at the instant
    (figure in the upper link)

    2. Relevant equations

    3. The attempt at a solution
    using Vr = r[dot]
    and V(thetta) = r.thetta[dot]
    and the corresponding equations for a(radial) and a(thetta)

    But how to determine the values of r and its derivatives??
  2. jcsd
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