Discuss the conservation of momentum in each of the following cases
(i) a rocket taking off from ground.
(ii) flying of a jet aeroplane.
Answers
Explanation:
(i) Before launching the rocket, the total momentum of the rocket and its fuel is zero. While during the launch, the downward momentum of the expanding exhaust gases is similar to the magnitude in the upward momentum of the rising rocket. Therefore, the total momentum of the system remains constant and here, at zero value. The sum of the two momentums before the collision is equal to its sum after the collision in a collision of two particles.
(ii) In an airplane, the compressor is run by the turbine and drives the gas through a tailpiece of the engine at a larger speed. As a result, forward momentum is created and the jet starts to move forward. The created forward momentum is equal to the backward momentum of the gases. In order to get a desired increase momentum in the forward direction, the ejection of gases and the rates of burning gases in the fuel-burning chamber is adjusted accordingly.
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