Problem: The 20kN load at B of the beam is supported by pins at A and C. Find internal force for rod CD and the support reactions at A and C. 1.5 m D 20kN 1.5 m -1.5 m B C Plan: 1. Put the x and y-axes in the horizontal and vertical directions, respectively. 2. Determine if there are any two-force members. 3. Draw a complete free-body-diagram of the beam AB. (30 points) 4. Apply the equations of the equilibrium to solve for the unknowns. (70 points)