Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.
Saw dust will not get melted easily.
Saw dust is a good conductor of heat.

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Physics
RADAR is used for:

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

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