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Suppose that you measured the moment of inertia of the system as I = 5.05 kg-m2. Assume the diameter of the pulley around which you wrap the string is d = 2.5 cm.

a) suppose the system is initially spinning at angular speed ωo = 2.05 rad/s. After you drop a cube of mass 786 g on it, the system rotates at ωf = 1.79 rad/s. Find:
- the moment of inertia of the cube: kg-m2
- the length of one side of the cube: cm

i found moment of inertia but could not find length

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