Physics
Who among the following is credited for the discovery of ''Expanding Universe"?

S Chandra Shekhar
Niels Bohr
V Raman
Edwin Hubble

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Physics
Railway tracks are banked on curves so that

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
The train may not fall down inwards
Necessary centripetal force may be obtained from the horizontal component of the weight of the train

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