The uniform slender bar shown in Figure 1 is pinned at a distance  l= 27.3cm from its center of mass. The bar is released from rest with θ = 19◦ with the force of gravity acting in the -y-direction shown in the figure. The bar is 99cm long and has a mass of 16kg. Determine the reaction at A immediately after release.

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Q: See Image

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Free undamped vibrations

Whenever an object/system displaces in either side of its equilibrium position with the help of an external/internal means, then the object/system moves regularly or randomly on both sides of its equilibrium position. This motion is called vibration. Generally, there are three types of vibration: longitudinal vibration, transverse vibration, and torsional vibration.