Physics
A dynamo is a device which

Creates electrical energy
Converts electrical energy into mechanical energy
Converts mechanical energy into electrical energy
Creates mechanical energy

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Physics
Railway tracks are banked on curves

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

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