A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30° above the horizontal. What is the angular acceleration of the rod at the instant it is released?
A. 4.7 rad/s2
B. 6.9 rad/s2
C. 6.4 rad/s2
D. 5.6 rad/s2
E. 4.2 rad/s2
Answer: C
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