The portion AOB of a mechanism consists of a 400-mm steel rod OB welded to a gear E of radius 12 mm which may rotate about a horizontal shaft O. It is actuated by a gear D and, at the instant shown has a clockwise angular velocity of 8 rad/s and a counterclockwise angular acceleration of 40 rad/s² Knowing that rod OB has a mass of 3 kg and gear E a mass of 4 kg and a radius of gyration of 85 m determine (a) the tangential force exerted by gear D on gear E, and (b) the components of the reacti at shaft O. 120 mm 2 00-

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