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Rotational motion Help

  1. Mar 4, 2007 #1
    1. The problem statement, all variables and given/known data

    Two masses, m1 and m2, are connected by light cables to the perimeters of two cylinders of radii, r1 and r2, respectively. The cylinders are rigidly connected to each other but are free to rotate without friction on a common axle. The moment of inertia of the pair of cylinders is I = 45 kgm^2.
    r1= 0.5m
    r2= 1.5m
    m1= 20kg
    a) Find the mass of m2 so that the system is in equilibrium
    b) the mass is removed and the system released from rest. Determine the angular acceleration, the cable supporting m1, and the linear speed of m1 at the time it has descended 1m.

    3. The attempt at a solution
    a) T=0
    r1F1 - r2F2 = 0
    m2= 6.7kg.

    b)T=I(alpha)
    then how do i go on?
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  2. jcsd
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