(Solution) - The weight and radius of friction disk A are WA 12 lb and -(2025 Original AI-Free Solution)

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The weight and radius of friction disk A are WA = 12 lb and rA = 6 in.; the weight and radius of friction disk B are WB = 6 lb and rB = 4 in. The disks are at rest when a couple M of moment 7.5 lb ? in. is applied to disk A. Assuming that no slipping occurs between the disks, determine
(a) The angular acceleration of each disk,
(b) The friction force that disk A exerts on disk B