Physics
Which of the following is the second largest source of global energy?

Fossil fuel
Nuclear Energy
Renewable Energy
None of these

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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
Necessary centripetal 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

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