Rocket (physics)

Jun 17th, 2015
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A rocket consists essentially of an engine plus fuel - it is the job of the engine to burn the fuel and throw the products out of the end of the rocket. The operation of a rocket is an excellent example of the Law of Conservation of Momentum, as shown below

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A rocket consists essentially of an engine plus fuel - it is the job of the engine to burn the fuel and throw the products out of the end of the rocket. The operation of a rocket is an excellent example of the Law of Conservation of Momentum, as shown below:Before the Engine Fires:Let's take our system as "rocket + fuel". For simplicity, suppose that the rocket is at rest, somewhere in space, where no outside forces will exert impulses on our system. Therefore, "rocket plus fuel" is an isolated system and the Law of Conservation of Momentum applies. Since both the rocket and the fuel are at rest, their individual momenta are zero, and so the total momentum of the system is zero.After the Engine Fires:When the rocket's engine fires, it pushes fuel out of the end of the rocket. Suddenly, part of the fuel has momentum, mv, toward the left as shown in the diagram.Since the total mom

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