Sometimes a cycle with well inflated tyre left in the sun has its tube burst open. Why?

If an inflated tyre bursts, the air escaping out is cooled. Why?

Why does a tyre can be inflated with large volume of air ?

It is difficult to move a cycle along a road with its brakes on. Why?

Selvi's house has an overhead tank in the shape of a cylinder. This is filled by pumping water from a sump (an underground tank) which is in the shape of a cuboid. The sump has dimensions 1.57 m x 1.44 m x 95cm. The overhead tank has its radius 60 cm and height 95 cm. Find the height of the water left in the sump after the overhead tank has been completely filled with water front the sump which had been full. Compare the capacity of the tank with that of the sump. (Use pi = 3.14)

Consider a cycle tyre being filled with air by a pump. Let V be the volume of the tyre (fixed) and at each stroke of the pump ∆V(<< V) of air is transferred to the tube adiabatically. What is the work done when the pressure in the tube is increased from P_1 to P_2 .

A spherical balloon grows to twice its radius when inflated. How has its volume increased ?

At the time of solar eclipse,the light from the entire sun is cut off,although its diameter is several hundred times larger than that of the moon.Why?

In a hydrogen atube it is observed that through a given cross-section 3.13xx10^(15) electrons per sec, moving from right to left and 3.12xx10^(15) protons per sec are moving from left to right. The electric current in the discharge tube ad its direction is