13.6.23. The differential equation of the vibrational motion of a material point of mass m = 12 kg is of the form y + 8y + 60U = 15sin3t. The strength of the resistance movement of the point R = - μy. Determine the coefficient μ.

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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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