Solving a problem in physics, section 62, point 51 wave

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51. A homogeneous rod of length L = 40 cm, mounted perpendicular to the horizontal axis, performs small oscillations under the influence of gravity. To determine at what distance l from the center of mass to the axis of suspension of the oscillation frequency of the maximum if the friction forces can be neglected.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)