Physics
Boyle's law is a relationship between

Pressure and volume
Volume and temperature
Pressure and temperature
Volume and density

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Physics
Railway tracks are banked on curves

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

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