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Angular Acceleration

  1. Nov 11, 2011 #1
    1. The problem statement, all variables and given/known data

    See attached

    2. Relevant equations

    Ok..Im having difficulty with this problem. I dont see what m has to do with angular accerleration.

    3. The attempt at a solution
    I believe the equation to use for this is a=rα ? I just cant get there..any help would be great

    thanks




    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Nov 11, 2011 #2

    rock.freak667

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    Homework Helper

    Well the tension would exert a torque, so what equation relates torque and angular acceleration?
     
  4. Nov 12, 2011 #3
    ok..found an equation....guess I need to organize equations better..seems to be my big problems.
    t=mr2α

    that should do it I think..anyone like to confirm?

    thanks
     
  5. Nov 12, 2011 #4

    Doc Al

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    Staff: Mentor

    Almost. The general equation that you need, as rock.freak was leading you towards, is:
    Torque = I*alpha

    What's I for a uniform disk?
     
  6. Nov 12, 2011 #5
    I = 1/2mr2
     
  7. Nov 12, 2011 #6

    Doc Al

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    Staff: Mentor

    Good!
     
  8. Nov 12, 2011 #7
    thanks for the help. much appreciated
     
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