rotational kinematics problem im stuck on please help!! my problem says this: -a pendulum consisting of a string of length L attached to a bob of mass m swings in a vertical plane. When the string is at an angle Theta to the vertical, A) what ist he tangential component of acceleration of the bob? B)what ist he torque exerted about the pivot point? C)show that T = I Alpha with At = Lalpha gives the same tangential acceleration as found in part A. i really have no idea on how to start, I would think i would need the parallel axis theorem but im not sure on how to get started.