21.1.13. Homogeneous rod length 0.4 m 1.2 kg weight at the end of which is attached the material point mass 0.8 kg, can be rotated in a horizontal plane. Determine the ratio of the angular stiffness of the coil spring, if the natural frequency of the system is 20 Hz.

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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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