A non-isotropic solid metal cube has coefficients of linear expansion as: $5 \times 10^{-5} /{ }^{\circ} \mathrm{C}$ along the $x$-axis and $5 \times 10^{-6} /{ }^{\circ} \mathrm{C}$ along the $y$ and the $z$-axis. If the coefficient of volume expansion of the solid is $\mathrm{C} \times 10^{-6 /{ }^{\circ} \mathrm{C} \text { then the value }}$ of $C$ is
$(60.00) \quad$ Volume, $V=I b h$
$\therefore \gamma=\frac{\Delta V}{V}=\frac{\Delta \ell}{\ell}+\frac{\Delta b}{b}+\frac{\Delta h}{h}$
( $\gamma$ = coefficient of volume expansion)
$\Rightarrow \quad \gamma=5 \times 10^{-5}+5 \times 10^{-6}+5 \times 10^{-6}$
$=60 \times 10^{-6 /{ }^{\circ} \mathrm{C}}$
$\therefore \quad$ Value of $C=60.00$
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