A uniform, 8.40-kg spherical shell 50.0 cm in diameter has four small 2.00-kg masses attached to its outer surface and equally spaced around it, as shown in Figure 3. This combination is spinning about the axis shown. Calculate the magnitude of the net torque needed to reduce the angular speed uniformly from 0.131 rad/s to 0.0873 rad/s in 30.0 s.

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