Answer to Question #345881 in Physics for seph

Question #345881

  IV. An iron wire 1.0 m long with a square cross-section 2.0 mm on a side is used  

              to support a 100 kg load. Find the change in length. 

    

      


1
Expert's answer
2022-05-30T15:18:12-0400
"\\sigma=\\varepsilon E"

"\\frac{F}{A}=\\frac{\\Delta l}{l_0}E"

"\\Delta l=\\frac{Fl_0}{AE}=\\frac{mgl_0}{AE}"

"\\Delta l=\\frac{100*9.8*1.0}{4.0*10^{-6}*200*10^9}\\\\\n=1.23*10^{-3}\\:\\rm m=1.23\\: mm"


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