Physics
If an empty cylinder is half filled with a liquid, its center of gravity is

Shifted upwards
Shifted upward or downward depending on the density of the liquid
Shifed neither upward nor downward
Shifted downwards

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short wave broadcasts are made by nearby radio stations.
Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

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