Physics
It is difficult to fix a nail on a freely suspended wooden frame. Which law supports this statement?

Pascal's law
Newton's second law
Newton's third law
Law of inertia

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Physics
Radiocarbon is produced in the atmosphere as a result of

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Lightning discharge in atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

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