Question

The density of copper is $3gc{m}^{-3}$. Express it in $kg{m}^{-3}$.

• A. $3$
• B. $300$
• C. $30$
• D. $3000$

Answer 1

The correct option is D $3000$

Density of copper,
${\rho }_c=3g/c{m}^3$
${\rho }_c=3\times \frac{\frac{1}{1000}kg}{{\left(\frac{1}{100}m\right)}^3}$
${\rho }_c=3\times {10}^{-3}\times {10}^{6}kg{m}^{-3}$
${\rho }_c=3\times {10}^{3}kg{m}^{-3}$
${\rho }_c=3000kg{m}^{-3}$