Given that for a single degree of freedom system,

k = stiffness coefficient

m = mass of machine and foundation,

critical damping is best defined by the expression

- 1
  
  $2 \sqrt{k m}$
- 2
  
  $2 k \sqrt{m}$
- 3
  
  $2 πk \sqrt{\frac{1}{m}}$
- 4
  
  $\frac{1}{2 π} \sqrt{\frac{k}{m}}$

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