Physics
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments

Depends on the speeds of various fragments
Is infinity
Is zero
Depends on the total mass of all the fragments

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

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

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