The density of iron is $7.8 \mathrm{g}/\mathrm{c}.\mathrm{c}$ and that of mercury is $13.6 \mathrm{g}/\mathrm{c}.\mathrm{c}$. Therefore, an iron block will float on mercury.

A body of volume $3 {\mathrm{cm}}^3$ is completely immersed in water. What is the buoyant force acting on the body.

A solid object of mass $100 \mathrm{g}$ and volume $200 {\mathrm{cm}}^3$ is put in water. Will the object float.

An iron block of density $7.8 \mathrm{g}/\mathrm{c}.\mathrm{c}$ and volume $50 {\mathrm{cm}}^3$ is immersed completely in water. Find

(a) the actual weight of iron block.

(b) buoyant force acting on iron block.

(c) loss of weight of iron block in water. (Take $g = 9.8 \mathrm{m}/{\mathrm{s}}^2$)