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

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

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Theory of Machine
Open pairs are those which have

Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion

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