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What is the magnitude of the initial angular acceleration

A uniform rod of length 32 m and mass 21.7 kg is free to rotate about a friction less pivot atone end in a vertical plane, as in the figure.The rod is released from rest in the horizontal position. What is the magnitude of the initial angular acceleration of the rod? The acceleration of gravity is 9.8 m/s2. Answer in units of rad/s2.

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