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
What is the direction of torque?

Parallel to the radius
Opposite to the direction of applied force
Same as the direction of applied force
Perpendicular to the direction of applied force

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