A metal block of mass m is suspended from a rigid support through a metal wire of diameter 14 mm. The tensile stress developed in the wire under…

A metal block of mass $\displaystyle m$ is suspended from a rigid support through a metal wire of diameter $\displaystyle 14$ mm . The tensile stress developed in the wire under equilibrium state is $\displaystyle 7 \times 10^5 \mathrm{Nm}^{-2}$. The value of mass m is $\displaystyle \_\_\_\_$ kg. (Take, $\displaystyle \mathrm{g}=9.8 \mathrm{~ms}^{-2}$ and $\displaystyle \pi=\frac{22}{7}$ )