Answer
$p = 2.4\times 10^9~N/m^2$
Work Step by Step
We can find the required stress:
$p = B~\frac{\Delta V}{V}$
$p = (1.4\times 10^{11}~N/m^2)~\frac{(0.855~m)^3-(0.850~m)^3}{(0.855~m)^3}$
$p = 2.4\times 10^9~N/m^2$
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