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Homework Help: Why won't my equation work for this pully system?

  1. Oct 29, 2012 #1
    1. The problem statement, all variables and given/known data
    Two objects, of masses m1 = 485.0 g and m2 = 494.7 g, are connected by a string of negligible mass that passes over a pulley with frictionless bearings. The pulley is a uniform 53.0-g disk with a radius of 4.08 cm. The string does not slip on the pulley.
    Find the accelerations of the objects.
    Find the tensions of each area of the string between the masses and the pully.

    2. Relevant equations
    T2R-T1R = I x (angular acceleration)
    Tension is found by mass x gravity
    3. The attempt at a solution
    If I can solve for the angular acceleration by knowing the inertia, then I should be able to find the acceleration of the masses by multiplying the angular acceleration by the radius. But I keep getting the wrong answer. What am I doing wrong?
  2. jcsd
  3. Oct 29, 2012 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Hello LarryJ. Welcome to PF !

    It will be much easy to help you, if you show considerably more detail regarding your method of solution.
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