A Thin Uniform Rod (Length = 1 $\degree$ With the Horizontal

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 $\degree$ 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