Physics
Railway tracks are banked on curves

necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction
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:

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

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