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no the subway cars use electricity to run
The Boeing 777 use the Pneumatics system.
A: I don't see why not LED are used on cars right now
Cars use hydraulics in the brakes and steering, and planes use hydraulics by adjusting the wings and rising and lowering the landing gear :P
Functional requirements describe function (mapping of inputs to outputs) of a system, what functions or services system should provide (to users).Use cases describe how user (use case actor) could interact with the system, i.e. functionality of the system available to actors (human users or another systems), from the actor's point of view.So, yes, use cases describe functional requirements. If we consider all functions provided by system as functions provided to actors - which is usually the case, use cases could be used to describe functional requirements of the system completely.