1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Rotationional Mechanics

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

    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 .
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted