Auniform rod is 2 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 degrees above the horizontal.
what is the angular acceleration of the rod at the instant it is released?
the rotational inertia of the rod, in this case, can be calculated using inerita= 1/3 m l^2 where m is the mass of the rod and l is the length of the rod.

a. 4.7 rad/s^2
b. 6.9 rad/s^2
c. 6.4 rad/s^2
d. 5.6 rad/s^2
e. 4.2 rad/s^2