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 rotational 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
Answer: A
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