Make a complete dynamic analysis of the four-bar linkage of Problem 12.7, but in the posture when

θ2 = 270◦. The constant angular velocity of input link 2 is ω2 = 18 rad/s ccw, and the external force at point D is FD = 8.94 kN∠64.3◦. The known kinematics are: θ3 = 46.6◦, θ4 = 80.5◦,

α3 = 178 rad/s2 cw, α4 = 256 rad/s2 cw, AG3 =

112 m/s2∠22.7◦, and AG4 = 119 m/s2∠352.5◦.