Physics
When a bullet is fired from a gun

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

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Physics
An integrated circuit is more advantages than a coventional circuit because

If a part of the integrated circuit fails the entire circuit is simply replaced
All listed here
They make the electric equipments more reliable and easier for servicing
A faulty part of a conventional circuit may be difficult to locate and repair

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