- #1
UrbanXrisis
- 1,196
- 1
a) what is the diameter of a steel wire 18m long that elongates 9mm when a load of 380kg is hung on its end?
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?
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?