A 220 kg wooden raft floats on Lake Sebu and when Boss Junlie who weighs 75 kg stands on the raft, it sinks 4 centimeters deeper into the water. When he steps off, the raft vibrates for a while. Determine the frequency of vibration. 0.688 sec 1.454 hz 0.688 hz 1.454 sec

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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.