The pendulum oscillates about the x-axis according to radians, where t is the time in s...

The pendulum oscillates about the x-axis according to radians, where t is the time in seconds. Simultaneously, the shaft OA revolves about the vertical z-axis at the constant rate ω_z = 2π rad/sec. Determine the velocity v and acceleration a of the center B of the pendulum as well as its angular acceleration α for the instant when t = 0.