Why is it easier to swim in sea water than in river water ?
It is easier to swim in sea water than in a river water because, the sea water contains salt which increases the density of water and also increases its upthrust $\left[\mathrm{F}=m_{0} g=\right.$ (Volume $\times$ density)g], so the body sinks less in it and we swim easily.
If $W$ be the weight of a body of density $\rho $ in vacuum then its apparent weight in air of density $\sigma $ is
A large ship can float but a steel needle sinks because of
A vessel containing water is moving with a constant speed towards right along a straight horizontal path. Which of the following diagrams represents the surface of liquid?
A hollow spherical shell at outer radius $R$ floats just submerged under the water surface. The inner radius of the shell is $r$. If the specific gravity of the shell material is $\frac{27}{8}$ $w.r.t.$ water, the value of $r$ is$......R$
What is the direction of buoyant force ?