Question

A load of 15N produces an extention of 0.10mm in a metal wire 10m in length if youngs modulus of metel is 1.8x10^11Pa calculate the cross section area of wire and the diameter of the wire

Answer 1

F=Force = 15N

Lenght = L0= 10m

A= Cross sectional Area = 1.8x10^11 Pa

ΔL= extension=0.10mm=1x10^-04

E= Young modulus (Pa)

Apply the Young's Module Formula:

E= F L0/A (ΔL)= 15 *10 / 1.8x10^11 *0.0001= 8.3x10^-6 Pa