Physics
Pressure Cooker cooks faster because

Boiling point decreases with rise of pressure
It cooks the food at low pressure
Higher temperature is attained for cooking
The material of the cooker is a good conductor

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Physics
RADAR is used for:

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

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