Physics
The energy that generates wind comes from what source?

Solar radiation
Anemometers
None of these
Ocean currents

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Physics
Railway tracks are banked on curves so that

The train may not fall down inwards
No frictional force may be produced between the tracks and the wheels of the train
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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