A slender bar 4 ft long and weighing 40 lb has one end attached to the ceiling by a pin. It is released from res in the horizontal position and swings about the pin without friction. a) Derive an expression for the angular acceleration of the bar for any angular position (theta) measured from the horizontal. b) Using the differential equations of the kinematics of rotation, derive an expression for the angular velocity as a function of (theta) Will rate life saver when answered.