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