6. In the tension experiment of a brass rod sample, if the engineering strain and engineering stress before necking were 0.06 and 200 MPa, respectively. Write down the expected true stress of the sample in MPa unit.
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7. Calculate the atomic radius (in nm) of an element has an FCC crystal structure, a density of 6.2 g/cm^(3), and atomic weight of 32.6 g/mol and (Avogadro's number is 6.022 x10^(23) atoms/mol. (Please give at least 3 digits answer)
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