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Two disks of the same thickness and same material are attached to a shaft as shown. The 3-kg disk A has a radius rA = 100 mm, and disk B has a radius rB = 125 mm. Knowing that the angular velocity of the system is to be increased from 200 rpm to 800 rpm during a 3-s interval, determine the magnitude of the couple M that must be applied to disk A.

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