Meriam, Kraige & Bolton — Plane Kinematics of Rigid Bodies: Problem 5_158

5/158 The figure illustrates a commonly used quick-return mechanism which produces a slow cutting stroke of the tool (attached to D) and a rapid return stroke. If the driving crank OA is turning at the constant rate \(\dot{\theta} = 3 \text{ rad/s}\), determine the magnitude of the velocity of point B for the instant when \(\theta = 30^\circ\).