Aspecimen of commercially pure copper has a strength of 240 mpa. estimate its average grain diameter using the hall-petch equation.

3.115× meter

Explanation:

hall-petch constant for copper is given by

      =25 MPa

      k=0.12 for copper

now according to hall-petch equation

= +

240=25+

D=3.115× meter

so the grain diameter using the hall-petch equation=3.115×   meter

answer:

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explanation:

answer:

explanation:

assault rifle is a rapid-fire, magazine-fed rifle designed for military use. it is a shoulder-fired weapon that allows the shooter to select between semi-automatic (requiring you pull the trigger for each shot), fully automatic (hold the trigger and the gun continuously fires) or three-shot-burst modes.