A vane 20cm long and 10 cm in diameter was pressed into a soft marine clay at the bottom of a bore hole. Torque was applied gradually and failure occurred at 1000 kg cm. The cohesion of the clay in $k g / c m^{2}$ is:

- 1
  
  $\frac{1}{π} x \frac{6}{7}$
- 2
  
  $\frac{1}{π} x \frac{5}{7}$
- 3
  
  $\frac{1}{π} x \frac{4}{7}$
- 4
  
  $\frac{1}{π} x \frac{3}{7}$

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