21.1.9. Determine the period of free oscillations of the gear pair, if the gears are the same, the weight of each is equal to 5 kg, the radius of gyration with respect to the rotation axis 6 cm and angular stiffness coefficient of the coil spring 1H Nm / rad.

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(DYNAMICS, Chapter 21 - Lagrange equation of the second kind, paragraph - 21.1: The vibrations of systems with one degree of freedom) 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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