The machine shown is used for forming metal plates. It consists of two toggles ABC and DEF which are attached to a hydraulic jack at pt. H. The toggles push the curved bar at G forward, pressing the plate into the cavity. The curved bar at G slides along frictionless rails at the top and bottom of the machine. If a 12-kN force is applied to the center of the plate, determine the force, F, from the hydraulic jack in the configuration shown.

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Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.