Physics
Railway tracks are banked on curves so that

No frictional force may be produced between the tracks and the wheels of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight 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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Physics
Hydro-electric power is a:

Renewable natural resource
Neither renewable nor non renewable resource
A mixture of renewable and non-renewable natural resource
non-renewable natural resource

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