Physics
Railway tracks are banked on curves

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
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Presence of gravity outside but not inside the spacecraft
Absence of gravity outside
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Fact that spacecraft in the orbit has no energy

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