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Homework Help: Euler' s equations and tau = zero?

  1. Apr 7, 2004 #1
    A uniform circular disk of mass m and radius a is constrained to rotate with constant angular speed omega abotu an axis making an angle theta with the disk' s axis of symmetry. Find the magnitude and direction of the angular momentum L and the torque tau exerted on the disk by its supporting axis. Give a physical interpretation of your answer.

    We had doen a similar thing in class but the professor assumed that tau = 0 for some reason and then went on to get some precession related stuff. Do I follow the same steps(using Euler' s equations as he did) and if so what is the significance of the tau being zero?
  2. jcsd
  3. Apr 7, 2004 #2
    Come on ..something anything would be great.
  4. Apr 7, 2004 #3


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    It would be useful if you post some of what your professor did (in particular: what was the statement of the problem he solved in class?, and what is this "tau" you mention?). The most info you give, the better.
  5. Apr 11, 2004 #4
    The assumption was that tau = 0 and from there, the Euler equations were solved and they gave a frequency. Along with that there was a few steps to show what omega was and that was about it really, I did not see anything special besides that.
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