Physics
What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?

No change will happen
All ice will melt
All water will become ice
Only some ice will melt

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Physics
Railway tracks are banked on curves

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

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