1. A spring-mass-damper system of M -0.05 Ib.s/in, K =15 Ib/in, and C=0.7 Ib.s/in is subjected to a harmonic force F(t)=30 Cos (10t) Ibf. Determine: (a) The equation of motion of

the system (b) The response as function of time (c) The value of the resonance frequency (d) The transmitted force F(+) етик X(+)