Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Absence of gravity outside
Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy

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

All listed here
If a part of the integrated circuit fails the entire circuit is simply replaced
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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