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Homework Help: Angular acceleration of a bar on a hinge

  1. Jun 13, 2010 #1
    1. The problem statement, all variables and given/known data
    A bar on a hinge starts from rest and rotates with [tex]\alpha[/tex]=(10+6t) rad/s2 t is in seconds. Determine the angle in radians the bar turns in the first 4 seconds.


    2. Relevant equations
    I'm a little stumped how to get this one started. I assume i need to get it from angular acceleration to angular displacement, but I'm not exactly sure how to do that. So do I have to integrate it with respect to time twice?


    3. The attempt at a solution
     
  2. jcsd
  3. Jun 13, 2010 #2
    That's right. Remember to use constants of integration/ boundary conditions in general (although it should make no difference in this case).
     
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