Physics
The moment of inertia of a body does not depend upon

The angular speed of the body
The mass distribution in the body
The mass of the body
The axis of rotation of the body

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Physics
Railway tracks are banked on curves so that

Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
The train may not fall down inwards
Necessary centripetal force may be obtained from the horizontal component of the weight of the train

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