Physics
What is unit of Viscosity ?

Coulomb
Joule per kilogram per Kelvin
Newton second per square meter
Watt per meter per degree celcius

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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
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
the train may not fly off in the opposite direction

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