The composite rigid body lies in the vertical plane and consists of the uniform block D and the L-shaped bar A B C. The block is rigidly attached to the L-shaped bar, which is uniform. Each segment of the L-shaped bar has length L = 0.75 m and mass mAB = mBC = 2 kg, the mass of the block is mD = 5 kg, and the width and height of the block are h = 0.3 m.
If the system is released from rest in the position shown, determine the initial angular acceleration of the composite body and the reaction at the pin A on the composite body.
Figure P7.54
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