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

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

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Physics
Planets do not twinkle because

They are very far away from the earth resulting in decrease in intensity of light
They are nearer to earth and hence we receive a greater amount of light.
Their distance from the earth does not change with time
They emit light of a constant intensity

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