A Thin Uniform Rod (Length = 1

Multiple Choice

A thin uniform rod (length = 1.2 m, mass = 2.0 kg) is pivoted about a horizontal, frictionless pin through one end of the rod. (The moment of inertia of the rod about this axis is ML²/3.) The rod is released when it makes an angle of 37° with the horizontal. What is the angular acceleration of the rod at the instant it is released?

A) 9.8 rad/s²
B) 7.4 rad/s²
C) 8.4 rad/s²
D) 5.9 rad/s²
E) 6.5 rad/s²