Question

A substance breaks down by a stress of ${10}^{6}n/m^2.$ If the density of the material of the wire is $3\times {10}^{3}kg/m^3$, then the length of the wire of the substance which will break under its own weight when suspended vertically. is

• A. $66.6m$
• B. $60.0m$
• C. $33.3m$
• D. $30.0m$

Answer 1

The correct option is C $33.3m$

$L=\frac{p}{dg}=\frac{{10}^6}{3\times {10}^3\times 10}=\frac{100}{3}=33.3m$