Question: A spring-mass system is subjected to a harmonic force whose frequency is close to the natural frequency of the system. If the forcing frequency is

A spring-mass system is subjected to a harmonic force whose frequency is close to the natural frequency of the system. If the forcing frequency is $39.8 \mathrm{~Hz}$ and the natural frequency is $40.0 \mathrm{~Hz}$, determine the period of beating.

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