13.6.18. Body mass m = 0.5 kg is suspended from the end of the spring with a spring constant of c = 200 N / m, and performs forced oscillations under the action of the driving force F = 15 sin pt Determine the angular frequency of the driving force at which resonance occurs.

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(Chapter 3 - Dynamics theme - 13.6: Forced oscillations) 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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