The oil well is driven by a 4-link mechanism. Link 1 is fixed. Link 2 is rigidly attached to the flywheel that is rotating 0.deltadeltadeltadelta rad/s CCW. The link dimensions are given in the corresponding colors in cm. At the instant that the angle between link 2 and 3 is a 90-degree angle, determine the angular velocity of the pump rigidly attached to link 4.