V K Sally and R Goel Solutions for Chapter: Gravitation, Exercise 14: EXERCISE

What do you understand by the following terms?

(a) Upthrust  (b) Buoyancy

State the factors which are responsible for the buoyant force.

State Archimedes’ principle?

State whether upthrust will increase or decrease, if:

(a) the volume of solid increases.

(b) the density of a liquid in which the solid floats decrease.

What do you understand by the term relative density? State its units.

How can you verify Archimedes’ principle by using a spring balance and an overflow jar?

A cube of side $5 \mathrm{cm}$ is immersed in water and then in the saturated salt solution. In which case will it experience a greater buoyant force? If each side of the cube is reduced to $4 \mathrm{cm}$ and then immersed in water, what will be the effect on the buoyant force experienced by the cube as compared to the first case for water? Give reason for each case.

A ball weighing $4 \mathrm{kg}$ of density $4000 \mathrm{kg} {\mathrm{m}}^{-3}$ is completely immersed in water of density ${10}^{3 }\mathrm{kg}/{\mathrm{m}}^3$. Find the force of buoyancy on it.(Given, $g=10 \mathrm{m} {\mathrm{s}}^{-2}$).