Physics
The moment of inertia of a body does not depend upon its

Angular velocity
Axis of rotation
Distribution of mass
Form of mass

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Physics
RADAR is used for:

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

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Physics
The sky appears blue because

The atmosphere scatters blue colour more than the others
All colours interfere to produce blue
It is actually blue
In white light, the blue component dominates

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