Question

The mass of steel sphere having density 7850$kg{m}^{-3}$ and radius 0.15$m$ is:

• A. 112$kg$.
• B. 290$kg$.
• C. 110.9$kg$.
• D. 300$kg$.

Answer 1

The correct option is C 110.9$kg$.

Mass of the sphere, $M=Density\times Volume$

Volume of the sphere is, $V=\frac{4}{3}\pi r^3$

$V=\frac{4}{3}\pi (0.15{)}^3=0.01412m^3$

$M=7850\times 0.01412$

$=110.9kg$