Physics
RADAR is used for:

locating submerged submarines.
locating geostationary satellites.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.

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Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
necessary centrifugal force may be obtained from the horizontal component weight of the train
necessary centripetal force may be obtained from the horizontal component of the weight of the train
to avoid frictional force between the tracks and wheels

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