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A uniform spherical shell of mass 8.60kg with diameter 48.0cm has four small masses of mass 2.00kg attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through the center of the sphere and two of the small masses .

What friction torque is needed to reduce its angular speed from 77.0rpm to 45.0rpm in a time interval of 26.0s ?

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