(a) Johnston and Gilman also observed that at a constant temperature the dislocation velocity obeyed a power law. See Eq. 5.20. Assuming that the dislocation velocity exponent, m, is 16.5 and that the stress, D, for a velocity of 1 cmx s-1 is 5.30 MPa, determine the stress needed to obtain a velocity that is 5 times greater than that given in Eq. 5.21.
(b) Also give your answer in psi.
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