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

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

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Physics
The blue colour of water in the sea is due to

Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water
Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water

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