Theory of Machine
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

52.92 N-s/m
18.52 N-s/m
1.4 N-s/m
529.2 N-s/m

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Theory of Machine
For dynamic balancing of a shaft

None of these
The net couple due to the dynamic forces acting on the shaft is equal to zero
The net dynamic force acting on the shaft is equal to zero
Both (A) and (B)

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