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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Physics
For an ideal gas, which one of the following statements does not hold true?

The kinetic energies of all gas molecules are not same
The speed of all gas molecules is same
The potential energy of the gas molecules is zero
There is no interactive force between the molecules.

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