Question

State the principle of rocket propulsion and obtain an expression for its acceleration and thrust on rocket. If in a rocket, fuel burns at a rate of 100 kgs and the exhaust gases are expelled out with a velocity 4.5 X 10 m/s. Calculate the force acting on the rocket​

Answer 1

Answer:

Relative velocity of exhaust gas V=2 km/s=2000 m/s

Thrust force F

t

=V

dt

dm

=2000×

dt

dm

Acceleration a=4.9 m/s

2

Mass of rocket M=1000 kg

Using Ma=F

t

−Mg

Or 1000×4.9=2000×

dt

dm

−1000×10

⟹

dt

dm

=7.35 kg/s

Explanation:

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