The high-strength steel in Figure is subjected to a stress alternating at 200 revolutions...

The high-strength steel in Figure is subjected to a stress alternating at 200 revolutions per minute between 600 MPa and 200 MPa (both tension). Calculate the growth rate of a surface crack when it reaches a length of 0.2 mm in both m/cycle and m/s. Assume that f = 1.0.