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The figure below shown two rotors connected by an elastic shaft undergoing torsional vibration. The rotor  has a mass of 2 kg and a diameter of 60 cm, while the rotor  has a mass of 1 kg and a diameter of 20cm. what is the distance l at which the node of vibration of torsonal vibration occurs?      

 

(a) 36cm                                     (b) 30cm               

(c) 22cm                                    (d) 18cm

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