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Principal axes for a disc

  1. Apr 12, 2012 #1

    Leb

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    1. The problem statement, all variables and given/known data

    I do not understand how the vector (1 -1 0)T represents the axis tangent to the disk at Q.

    35ks6jr.jpg

    3. The attempt at a solution

    Tried thinking in terms of simple vector addition, but just got another vector in the radial direction...
    I mean, (1 -1 0)T is parallel to a tangent vector to Q, is that sufficient ?
     
  2. jcsd
  3. Apr 12, 2012 #2

    tiny-tim

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    Hi Leb! :smile:
    I don't really understand what's worrying you. :confused:

    don't "the axis tangent to the disk at Q" and "parallel to a tangent vector to Q" mean the same thing?
     
  4. Apr 12, 2012 #3

    Leb

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    Hello tiny-tim!

    Apparently I was a bit rusty with vectors and was not sure if we are free to translate to parallel vectors on top of each other, but thanks !
     
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