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Required information

It is common to observe internal cracks of approximately $2{10}^{-6}m(2m)$ in the manufacturing of plate glass with properties given in problem $7\mathrm{.}26($modulus of elasticity $E=84$GPa, surface energy $V_S=1\mathrm{.}6\frac{J}{m^2},a_0=16\mathrm{.}0nm).$

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Use Griffith's theory to determine the fracture strength of the plate glass.

The fracture strength of the plate glass is $($ MPa. $($Round the final answer to four decimal places.$)$