1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Principal axes for a disc

  1. Apr 12, 2012 #1


    User Avatar

    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.


    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


    User Avatar
    Science Advisor
    Homework Helper

    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


    User Avatar

    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 !
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook