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Rotational kinematics.

  1. Nov 21, 2009 #1
    1. The problem statement, all variables and given/known data

    i've altered this image to be easier to read. ignore problem 1 except for the information given. the picture of the rotating object is for problem 2, which is the problem i need help with
    http://img32.imageshack.us/img32/3690/screenshot20091121at931x.th.png [Broken]

    2. The attempt at a solution

    i've solved for 'w' when the rotating bar is vertical, as well as velocity tangential. my issue is the whole 'sweet spot' definition.
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Nov 21, 2009 #2


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    Homework Helper

    You must have d, L and x=L/2 in your answer for v.
    Hopefully the expression can be arranged so these appear together as d/L.
    You are just asked to replace each d/L with Z.
  4. Nov 23, 2009 #3
    I've attempted to solve the problem, found the centre of mass to be Xcm = (L+2d)/3. Not sure where to go from there, though.
  5. Nov 23, 2009 #4


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    Homework Helper

    Use your expression for the linear speed of the tip.
    Replace every d/L with z.
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