(Solved):
Problem For which \( \zeta \) the damped frequency of the system \[ \ddot{\theta}+2 \omega \zeta \ ...
Problem For which \( \zeta \) the damped frequency of the system \[ \ddot{\theta}+2 \omega \zeta \dot{\theta}+\omega^{2} \theta=0 \] is \( 3 / 5 \) of its natural frequency?
