Question

how to distinguish between a raw egg and a boiled egg using physics

Answer 1

Here is your answer....



The raw egg contains more of the liquid in it and when you rotate it the centrifuge will act on the liquid and push it against the inner surface of egg. This increases the rotational inertia of the egg and it spins slowly. On the other hand, the hardboiled egg will have lower rotational inertia and will spins fast relative to the raw egg.
When the raw egg starts rotating, the liquid inside the egg gains angular momentum. With large rotational inertia, the liquid’s angular momentum will not be lost quickly and in time for which you stop the egg.
Therefore when you release the egg again, it will start spinning again because of the angular momentum of the liquid.

Hope it helps you.

Answer 2

this is due to conservation of angular momentum