How does a hot air balloon work?

Assertion : The use of hot air balloons in sports and for meteorological observations is an application of Charle's law Reason : Hot air is less and hence gases expand on heating

How does a vacuum cleaner work?

Use of hot air ballons in sports and meteorological observations in an application of

How does a catalyst work?

A ladder of length l carrying a man of mass m at its end is attached to the basket of a balloon of mass M. The entire system is in equilibrium in the air. As the man climbs up the ladder into the balloon, the balloon descends by a height h. The work done by the man is

A ladder of length l carrying a man of mass m at its end is attached to the basket of a balloon of mass M. The entire system is in equilibrium in the air. As the man climbs up the ladder into the balloon, the balloon descends by a height h. The potential energy of the man

When does a force do work ?