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Not calc based! tangential and angular acceleration

  1. Nov 3, 2011 #1
    1. The problem statement, all variables and given/known data
    a disk rotates with constant angular accel. the initial angular speed of the disc is 2pie rad/s. After the disk rotates through 10pie rad, the ang speed is 7pie rad/s.

    2. Relevant equations
    a. what is the mag of the angular accel?


    3. The attempt at a solution
    alpha=delta omega/delta time
    omega=delta theta/delta time
    etiher or both?
     
  2. jcsd
  3. Nov 3, 2011 #2

    PhanthomJay

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    the first one has 2 unknowns and the second one is wrong...why not try one of the other kinematic equations for constant angular acceleration.....the one that relates omega with alpha and theta?
     
  4. Nov 3, 2011 #3
    i have no idea! HELLLP
     
  5. Nov 3, 2011 #4

    PhanthomJay

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    Well you seem to have known somehow that alpha=delta omega/delta time, how did you know that? You can find the equations on the link below, 4th slide:

    http://www.colorado.edu/physics/phys2010/phys2010_fa11/LectureNotes/phys2010_fa11_lecture28.pdf [Broken]

    You should first learn, understand, and memorize the motion equations for translational motion.
     
    Last edited by a moderator: May 5, 2017
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