Question

Find the greatest length of steel wire that can hang vertically without breaking.Breaking stress of steel `=8.0xx10^(8) N//m^(2)`. Density of steel `=8.0xx10^(3) kg//m^(3)`. Take `g =10 m//s^(2)`.
A. `4xx10^(4)m`
B. `4xx10^(3)m`
C. 400 m
D. 40 m

Answer 1

Correct Answer - B
Breaking stress `=rho Lg`
`therefore L=("Breaking stress")/(rho g)`
`=(4xx10^(8))/(10^(4) xx 10)=4xx10^(3)m`.