Physics
The average kinetic energy of the molecules of an ideal gas is directly proportional to

Mass of Molecules
Temperature of environment
Absolute temperature of the gas
Velocity of Molecules

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Physics
Railway tracks are banked on curves so that

Necessary centripetal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train

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