Physics
Railway tracks are banked on curves so that

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

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Physics
The mass defect is the result of what action occurring?

Mass being converted to energy when protons and neutrons bind together in a nucleus
Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons break apart in a nucleus
Protons and electrons being attracted to each other

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