A moment torque M_(o) sin\omega t is applied at the end of the shown bar. Determine the maximum value of M_(o) such that the amplitude of the steady-state response of the angular oscillation does not exceed10º if \omega _(f)=500 rpm, K=7000 (N )/(m) , c=650 (N)/(m). L=1.2 m , m=15 kg