State the law of conservation of mass. Give one example to illustrate this law.

State the law of constant proportions. Give one example to illustrate this law.

State the law of conservation of charge. Give some examples in which this law is obeyed.

State the law of conservation of liner momentum.

State the law of conservation of energy. Give some examples in which this law is obeyed.

The law of conservation of mass was given by :

The law of conservation of mass is not obeyed by a

(a) State Newton's third law of motion and give two examples to illustrate the law. (b) Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.