The 25-lb rectangular plate has a natural period of vibration t = 0.4 s, as it oscillates around the axis of rod AB. Neglect the mass of the rod. Suppose that a = 2 ft. b = 4 ft. (Figure 1) Figure < 1 of 1 > Part A Determine the torsional stiffness of the rod, measured in lb-ft/rad. Express your answer in pound-feet per radian to three significant figures. ΕΠΙΑΣΦvec k= ^ A ? lb-ft/rad

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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.