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Question

A uniform rod of length l and mass m is free to rotate in a vertical plane about A. The rod initially in horizontal position is released. The initial angular acceleration of the rod is (Moment of inertia of rod about A is ml23
70996.jpg
  1. 3g2l
  2. 2l3g
  3. 3g2l2
  4. l2

A
2l3g
B
3g2l2
C
l2
D
3g2l
Solution
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Here τ = Iα

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