A 400-kg motor supported by four springs, each of constant Review Problems 150 kN/m, is constrained to move vertically. Knowing that the unbalance of the rotor is equivalent to a 23-g mass located at a distance of 100 mm from the axis of rotation, determine for a speed of 800 rpm
(a) the amplitude of the fluctuating force transmitted to the foundation,
(b) the amplitude of the vertical motion of the motor.
