Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another balloon ?

Explain why a charged body loses its charge if we touch it with our hand.

[A]: The "balloon pump" is used to assist the heart. [R]: Balloon is used when heart is removed from the body.

A man in a balloon rising vertically with an acceleration of 4.9 ms releases a ball 2 second after the balloon is let go from the ground. The greatest height above the ground reached by the ball is:

A cylindrical conductor is placed near another positively charged conductor. The net charge acquired by the cylindrical conductor will be:

An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall.What force might be responsible for the attraction between the balloon and the wall ?

A spherical balloon is being inflated at the rate of 35 cc//min. The rate of increase of the surface area of the balloon when its diameter is 14 cm is...

Draw a diagram of human respiratory system and label the following : (i) part where air is filtered by fine hair and mucus. (ii) part which terminates in balloon - like structures. (iii) balloon - like structures where exchange of gases takes place. (iv) part which separates chest cavity from abdominal cavity.