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Torque pulley homework help

  1. Jan 30, 2008 #1
    1. The problem statement, all variables and given/known data
    Two blocks are connected by a string of negligible mass passing over a pulley of radius .25 m and moment of inertia I. Block 1 is on an incline of 37 degrees and block 2 is hanging down. The hanging mass is accelerating down at 2 m/s^2. Find I. (I already know tensions T1 and T2)

    2. Relevant equations

    Tnet = I*[tex]\alpha[/tex]

    3. The attempt at a solution

    T1(incline block) = 118 N, T2(hanging block) = 156 N
    .25*156-.25*118cos(37) = I(2/.25)

    I think you need the cos(37) because T1 (on the incline) has a vertical component that does not contribute to the torque. Is that correct?
  2. jcsd
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