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![]() Citat:
https://en.wikipedia.org/wiki/Rocket A rocket engine is a type of jet engine[1] that uses only stored rocket propellant mass for forming its high speed propulsive jet. Rocket engines are reaction engines, obtaining thrust in accordance with Newton's third law. Most rocket engines are internal combustion engines, although non-combusting forms (such as cold gas thrusters) also exist. Vehicles propelled by rocket engines are commonly called rockets. Since they need no external material to form their jet, rocket engines can perform in a vacuum and thus can be used to propel spacecraft and ballistic missiles. https://en.wikipedia.org/wiki/Rocket_engine Rockets create thrust by expelling mass backwards in a high speed jet (see Newton's Third Law). Chemical rockets, the subject of this article, create thrust by reacting propellants within a combustion chamber into a very hot gas at high pressure, which is then expanded and accelerated by passage through a nozzle at the rear of the rocket. The amount of the resulting forward force, known as thrust, that is produced is the mass flow rate of the propellants multiplied by their exhaust velocity (relative to the rocket), as specified by Newton's third law of motion. Thrust is therefore the equal and opposite reaction that moves the rocket, and not by interaction of the exhaust stream with air around the rocket. https://en.wikipedia.org/wiki/Rocket_propellant Sau pe intelesul tau si a altora de nivelul tau, racheta nu se deplaseaza pentru ca "aerul sprijina jetul" ci doar pentru ca exista jetul expulzat cu mare viteza, inclusiv in vid. De fapt si de drept, merge mai bine in vid decat in atmosfera, pentru ca nu exista frecare (afli tu si despre asta intr-o buna zi). Concluzia: ignorant total la cele mai de baza principii de fizica. ![]() Asteptam sa ne lamuresti si din ce manual de fizica ai auzit de "forta vidului" si citatele din Sf. Scriptura unde se vorbeste de "Luna Semisfera de Gheata sursa Frigului Bun".
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Suprema intelepciune este a distinge binele de rau. Last edited by AlinB; 06.04.2016 at 12:39:09. |
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