A uniform 8.40-kg, spherical shell SO.O cm m diameter has four small 2.00-kg masses 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 (Fig. 10.42). What friction torque is needed to reduce its angular speed from 7S.0 rpm to SO.O rpm in 30.0 s?

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Spin axis