The assembly consists of two 15-lb slender rods and a 20-lb disk. If the spring is unstr...

The assembly consists of two 15-lb slender rods and a 20-lb disk. If the spring is unstretched when θ = 45° and the assembly is released from rest at this position, determine the angular velocity of rod AB at the instant θ = 0°. The disk rolls without slipping.