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The mass of $2 \mathrm{~m}^{3}$ of steel is $15600 \mathrm{~kg}$. Calculate the density of steel in SI units.

Solution. We know that: Density $=\frac{\text { Mass }}{\text { Volume }}$

$$\begin{array}{l} =\frac{15600 \mathrm{~kg}}{2 \mathrm{~m}^{3}} \\ =7800 \mathrm{~kg} / \mathrm{m}^{3} \end{array}$$

Thus, the density of steel in SI units is $7800 \mathrm{~kg} / \mathrm{m}^{3}$.
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