Determine the carburizing time necessary to achieve a carbon concentration of 0.45 wt% at a position 2mm into the iron-carbon alloy that initially contains 0.2wt.% C. The surface concentration is to be maintained at 1.3wt.% C, and the treatment is to be conducted at 1000oC. (D = 1.93 x 10-11 m2/s). Assume non-steady state diffusion

answer:

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answer:

the answer is d

explanation:

import math

x=int(input("enter a number: "))

print (math.sqrt(math.fabs(

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