Question

2. In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward. Which principle is followed in this take off of the rocket?
a) Moment of inertia b) Conservation of momentum
c) Newton’s first law of motion d) Newton’s law of gravitation

Answer 1

Answer:

The answer is b) conservation of momentum as the mass decreases of the rocket the speed increases ....Yes d) Newtown's third law of motion is also applicable

Explanation:

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Answer 2

Answer:

The right answer to the given question is option (b): conservation of momentum.

Explanation:

• The propulsion of a rocket follows the two laws given below:

1. Newton's third law
2. Conservation of momentum

• Newton's third law says that for every given action there is always an equal and opposite reaction.
• We know that a rocket emits hot burning gases in the downward direction thus providing an equal and opposite reaction helping the rock to move in the upward direction.
• The conservation of momentum says that when two bodies clashes or get separated, then the energy before and after the clashing or separation remains the same.
• Initially, the total momentum of the gases and rockets is 0 as they are stationary. But after gases start burning, the transmitted momentum of the rocket is equal and opposite making the total momentum zero.

So, among all the given options in the question, the rocket follows the conservation of momentum law during its take-off.