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The yield strength for an alloy that has an average grain diameter of $4\mathrm{.}6\backslash$times $10^(-2)$mm is $140$ MPa $.$ At a grain diameter of $7\mathrm{.}1\backslash$times $10^(-3)$mm$,$

the yield strength increases to $265$ MPa $.$ At what grain diameter, in mm$,$ will the yield strength be $233$ MPa $?$

d$=$

mm

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