a) what is the diameter of a steel wire 18m long that elongates 9mm when a load of 380kg is hung on its end?(adsbygoogle = window.adsbygoogle || []).push({});

b) if the elastic limit is 3.00E8 N/m^2, does permanent deformtion occur?

a.

[tex]\Delta L=FL/YA[/tex]

[tex]9E-3m=\frac{3724N*18m}{20E10N/m^2*A}[/tex]

[tex]A=3.724E-5m^2[/tex]

[tex]diameter=6.8859mm[/tex]

b.

[tex]stress=F/A[/tex]

[tex]stress=\frac{3724N}{3.724E-5m^2}[/tex]

[tex]stress=1.00x10^8N/m^2[/tex]

no deformation

is that all correct?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Find diameter of steel wire - stress

**Physics Forums | Science Articles, Homework Help, Discussion**