1. A 150-kg sewing machine operates at 1200 RPM and hasa rotating unbalance of 0.45 kg-m. What is the max stiffness of anundamped isolator such that the force transmitted to the machine’sfoundation is less than:
a) 1547
b) 2547
2. Redesign helicopter seat (i.e. find new stiffness) sothat the maximum velocity experienced by the pilot is 1mm/sec.
