Answer
$1.09\text{ cm}$
Work Step by Step
$T_1 = (7+273) K=280K$
$T_2=(88+273) = 361 K$
$r_1=0.01$
$\frac{r_2}{r_1}=\sqrt[3]{\frac{T_2}{T_1}}$
$r_2=r_1\sqrt[3]{\frac{T_2}{T_1}}$
$=0.01\sqrt[3]{\frac{361}{280}}\approx 0.0109\text{ m}$
$=1.09\text{ cm}$
