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Homework Help: (kinematics) Is it to derive into radial and transverse components?

  1. Sep 3, 2008 #1
    1. The problem statement, all variables and given/known data
    A wire OA connects the collar A and a reel located at O as shown in the picture. Knowing that the collar moves to the right at a constant speed v0, determine θ'' (the 2nd-order-derivative of θ) in term of v0, b and θ.
    http://www.freeimagehosting.net/uploads/3cad8b54c6.jpg

    Is it to derive into radial and transverse components?
    I can't figure out the unit vector e θ and er. How can we set up it?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 3, 2008 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    Hi fociboy! :smile:

    You know the horizontal speed is constant, so use x and y coordinates, and x' = v0, y' = 0, and rewrite in terms of r' and θ'. :smile:
     
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