4- A single-cylinder air compressor of mass 100 kg is mounted on rubber mounts. The stiffness and damping constants of the rubber mounts are given by 106 N/m and 2000 N-s/m, respectively. If the unbalance of the compressor is equivalent to a mass 0.1 kg located at the end of the crank (point A), determine the response of the compressor at a crank speed of 3000 rpm. Assume r = 10 cm and /= 40 cm.