Physics
Railway tracks are banked on curves

necessary centripetal force may be obtained from the horizontal component of the weight of the train
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

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Physics
What is a neuron ?

The anti-particle of neutron
Basic unit of energy
Basic unit of nervous system
Particle released during radioactivity

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