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A uniform rod (mass = 2.8 kg, length = 8.68 m) is free to rotate about a frictionless pivot at one end. The rod is

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A uniform rod (mass = 2.8 kg, length = 8.68 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 68 below the horizontal

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