Physics
In case of uniform circular motion, the acceleration is

Constant in magnitude and directed radially inwards
Variable in magnitude but tangential to the circle
Variable in magnitude but constant in direction
Zero

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

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

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