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Rockets
A rocket is a vehicle,
missile or aircraft which obtains thrust by
the reaction to the ejection of fast moving
exhaust gas from within a rocket engine. Often
the term rocket is also used to mean a rocket
engine.
In
military terminology, a rocket generally
uses solid propellant and is unguided. These
rockets can be fired by ground-attack aircraft
at fixed targets such as buildings, or can
be launched by ground forces at other ground
targets. During the Vietnam era, there were
also air launched unguided rockets that
carried a nuclear payload designed to attack
aircraft formations in flight.
In all rockets the exhaust
is formed from propellant which is carried
within the rocket prior to its release. Rocket
thrust is due to accelerating the exhaust
gases (see Newton's 3rd Law of Motion).There
are many different types of rockets, and a
comprehensive list can be found in spacecraft
propulsion- they range in size from tiny models
that can be purchased at a hobby store, to
the enormous Saturn V used for the Apollo
program.
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