Physics
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will

First rise and then fall
Rise
Fall
Remain the same

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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
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

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