Physics
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

10 MeV
1 MeV
0.1 MeV
100 MeV

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Physics
Railway tracks are banked on curves

to avoid frictional force between the tracks and wheels
the train may not fly off in the opposite direction
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 weight of the train

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