A man weighing 800 N is standing on a chair. In order to support the man, what is the chair exerting?

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

Explain what will happen if decomposers were apsent from a forest ecoysystem.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this