Posted by **HELP!!!!** on Friday, March 25, 2011 at 7:36pm.

A thin uniform rod (length = 1.3 m, mass = 4.1 kg) is pivoted about a horizontal frictionless pin through one of its ends. The moment of inertia of the rod through this axis is

1/3 m L2.

The rod is released when it is 55° below the horizontal. What is the angular acceleration of the rod at the instant it is released?

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