Question

The diameter of a lead ball is $2.1cm$. The density of the lead used is $11.34g/c^3$. What is the weight of the ball?

Answer 1

Diameter of lead ball$=2.1$cm

Radius$\left(r\right)=\frac{2.1}{2}$cm

Volume$=\frac{4}{3}\pi r^3$

$=\frac{4}{3}\times \frac{22}{7}\times \frac{21}{20}\times \frac{21}{20}\times \frac{21}{20}$

$=4.851c{m}^3$

Density$=11.34g/c{m}^3$

Density$=\frac{Mass}{volume}$

$11.34=\frac{Mass}{4.851}$

Mass$=11.34\times 4.851$g

Mass$=55.01$g.