4. The rigid beam AB is supported by steel (E = 200 GPa, v = 0.3) rods AC and BD of identical lengths 2 m and diameters 60 mm. All the pins are single shear and have a diameter of 80 mm. For the distributed load shown, a) determine the normal stress in rod AC. b) Determine the change of length of rod AC. c) Determine change in the diameter of rod AC. d) Determine the shear stress in pin A. 3 kN/m 2 m A Lim ★ + 1 m - 1 m

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.