Describe the rocket propultion.

1.	Describe the rocket propultion.
Answer» Solution :(i) Propulsion of rockets is baed on the law of conservation of linear momentum as well as Newton.s III law of motion. (ii) Rockets are filled with a fuel (either liquid or solid) in the propellant tank. When the rocket is fired, this fuel is burn and a HOT gas is ejected withahigh speed from the nozzle of the rocket, producing a huge momentum. (iii) To balance this momentum, an EQUAL and opposite reaction force is PRODUCED in the combustion chamber, which makes the rocket project forward. (iv) While in motion, the MASS of the rocket gradually decreases, until the fuel is completely burnt out. (v) At one stage, it reaches a VELOCITY, which is sufficient to just escape from the gravitational pull of the earth. this velocity is called escape velocity.

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