a) An electric motor with a stund has a mass M 12 kg. It is supported by four identical springs, each with the spring constant k 270 kN/ m and four vibration dampers, each with the damping constant c. The rotor has the angular velocity w and is unbalanced, which corresponds to a small mass m - 6 g (included in M) has a circular motion at the distance r 0.08 m from the axis. Determine the attenuation constant c that causes the amplitude to -1 mm as the angular frequency of the motor is the same as the natural angular frequency of the undamped system. cot M. be A The answer to the question is c