21.1.4. Determine the natural frequency in radians / second of small oscillations of a homogeneous rigid rod of length l, if its mass is 3 kg, the spring constant of the spring 400 N / m. The rod moves in a horizontal plane.

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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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