A damped single degree of freedom system whose undamped natural frequency, $\omega_{n}=10 H z,$ is subjected to sinusoidal external force. Power is half of the maximumfor the two frequencies of $60.9469 \mathrm{rad} / \mathrm{s}$ and $64.7168 \mathrm{rad} / \mathrm{s}$. The damping factor associated with the vibrating system (in \%) is_________________

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A damped single degree of freedom system whose undamped natural frequency, $\omega_{n}=10 H z,$ is subjected to sinusoidal external force. Power is half of the maximumfor the two frequencies of $60.9469 \mathrm{rad} / \mathrm{s}$ and $64.7168 \mathrm{rad} / \mathrm{s}$. The damping factor associated with the vibrating system (in \%) is_________________