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
necessary centripetal force may be obtained from the horizontal component of the weight of the train
the train may not fly off in the opposite direction

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Physics
Solar eclipse will take place when

the moon is between the sun and the earth
the earth is between the moon and the sun
the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth

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