Physics
The direction of heat flow between two objects depends on

Their heat contents
Whether they are in solid, liquid or gaseous state
Their temperatures
Their masses

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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
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

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