Physics
When a bullet is fired from a gun

The gun jumps up
The gun recoils with the same momentum as the bullet
The gun moves forward
The gun does not move

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Physics
Inside an aeroplane, flying at a high altitude,

normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.
normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.

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