Physics
A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed
No frictional force may be produced between the wheels and the axle
His weight may be reduced
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

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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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