Physics
What is the unit of the physical quantity Entropy?

Newton per kelvin
Joule per kelvin
Pascal per kelvin
Watt per kelvin

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Physics
Railway tracks are banked on curves so that

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

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