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A thin rod (length = 2.98 m) is oriented vertically, with its bottom end attached to...

A thin rod (length = 2.98 m) is oriented vertically, with its bottom end attached to the floor by means of a frictionless hinge. The mass of the rod my be ignored, compared to the mass of an object fixed to the top of the rod. The rod, starting from rest, tips over and rotates downward. What is the angular speed of the rod just before it strikes the floor? Consider using the principle of conservation of mechanical energy.

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