The two-bar mechanism consists of a lever arm AB and smooth link CD, which has a fixed

Question:

The two-bar mechanism consists of a lever arm AB and smooth link CD, which has a fixed smooth collar at its end C and a roller at the other end D. Determine the force P needed to hold the lever in the position . The spring has a stiffness k and unstretched length 2L. The roller contacts either the top or bottom portion of the horizontalguide.