Meriam, Kraige & Bolton — Plane Kinematics of Rigid Bodies: Problem 5_117

5/117 The system of Prob. 5/88 is repeated here. At the instant under consideration, the rod of the hydraulic cylinder is extending at the constant rate \( v_A = 2 \text{ m/s} \). Determine the angular acceleration \( \alpha_{OB} \) of link \( OB \). (From Problem 5/88 diagram: link \( AB \) length is \( 180 \text{ mm} \), link \( OB \) length is \( 120 \text{ mm} \). The angle link \( AB \) makes with the horizontal at \( A \) is \( 60^\circ \). The angle link \( OB \) makes with the horizontal at \( O \) is \( 15^\circ \).)