13.6.13. Load mass m = 18 kg, suspended to a spring with stiffness coefficient c = 360 N / m, performs vertical oscillations under the action of the vertical driving force F = 36sin3t. Determine the amplitude of the forced oscillations

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(Chapter 3 - Dynamics theme - 13.6: Forced oscillations) of Reshebnik to the collection of short tasks on the theoretical mechanics Kep OE, JA Viba, OP Grapis, JA Svetinysh et al. Publishing Moscow / Graduate School / 1989, 2009, 2012.
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