Problem 1 18 Finding equivalent constant of spring bar problem

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MECHANICAL VIBRATIONS
Images from S. Rao, Mechanical Vibrations, 6th Edition
Video by Carmen Muller-Karger, Ph.D
Florida International University

Finding equivalent spring constant, rotating bar, using two approaches: Moment about the pivot and calculating potential energy.
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why there is x/2 in the potential energy method

UnaisaZahid-ek
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Why Fs1 has -ve moment while the direction is the same as F at point A? at 5:10

kwonaiman