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Rotationional Mechanics

  1. Aug 10, 2015 #1
    1. The problem statement, all variables and given/known data
    screenshot_47.png

    2. Relevant equations
    Net Torque = Moment of Inertia * Angular Acceleration
    Net Force = Mass * Acceleration

    3. The attempt at a solution
    I first applied the first formula on the pulley, I found out that Tension Force = Acceleration
    Then, I used newton's second law on m1 which gave me: 120 - T = 12a ---> 120 - a = 12a ---> 13a =120 ---> a = 9.2

    Which is not on the choices,,
    any help please
    thank you
     
  2. jcsd
  3. Aug 10, 2015 #2
    What did you do here ? How is force of tension equal to acceleration ?

    Hint : Is tension on both sides of the pulley the same ? Why / Why not ?
    Also , your solution will require three equations .

    Hope this helps .
     
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