21.1.12. Determine the moment of inertia of a rigid body with respect to its axis of rotation, if the natural frequency of small vibrations of the body is equal to 4 Hz, the distance l = 2 m, with a spring rigidity coefficient = 80 kN / m.

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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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