Physics
Flywheel is an important part of a steam engine because it :

Decreases the moment of inertia
Gives strength to the engine
Accelerates the speed of the engine
Helps the engine in keeping the speed uniform

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Physics
Why does the sea appear blue in colour?

Interference of the sun light from water surface
Refraction of the sun light
Scattering of the sunlight by water molecules
Reflection of the sun light from water surface

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