Explain the following:
A hollow glass sphere which floats with its entire volume submerged in water at `4^(@)C`, sinks when water is heated abover `4^(@)C`.

Explain the following: An egg sinks in fresh water, but floats in a strong salt solution.

A concrete sphere of radius R has cavity of radius r which is packed with sawdust. The specific gravities of concrete and sawdust are respectively 2.4 and 0.3 for this sphere to float with its entire volume submerged under water. Ratio of mass of concrete to mass of swadust will be

What happens when heavy water is treated with Al_(4)C_(3)

The densit of a block of wood which flots on water with 0.1 of its volume above water is:

An expansible balloon filled with air is floating on the top surface of a lake, with 2//3 of its volume is submerged in water. How deep should it be sunk in water without changing the temperature of air in it, in order that it is just in equilibrium, neither sinking nor rising further? Height of water barometer = 10 m .

How does the density of water change when : it is heated from 0^@C to 4^@C

Explain the terms boiling and boiling point. How is the volume of water affected when it boils at 100^@ C ?

Which of the following behaves like water between 0^(@)Cand4^(@)C .

An object is floating in water with fraction of its volume submerged in water filled in beaker which is at rest with respect to ground. Now this beaker is accelerated with constant acceleration downwards (a lt g) then

An aluminium sphere is dipped into water at 10^(@)C . If the water is now heated, the force of buoyancy on the sphere