How Do You Calculate the Thrust of a Rocket at Takeoff?

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SUMMARY

The thrust of a rocket at takeoff can be calculated using Newton's third law and the principle of conservation of energy. In this discussion, the thrust is determined by multiplying the mass flow rate of the propelling gases (1200 kg/s) by their exit velocity (39700 m/s), resulting in a thrust force of 47,640,000 N. Gravity is not directly included in this calculation, as the thrust value represents the force exerted by the rocket engines at the moment of takeoff.

PREREQUISITES
  • Understanding of Newton's third law of motion
  • Basic principles of conservation of energy
  • Familiarity with thrust calculation in rocketry
  • Knowledge of units of force (Newtons)
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Aerospace engineers, physics students, and anyone interested in rocketry and propulsion systems will benefit from this discussion.

kmax12
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Calculate the force exerted on a rocket, given that the propelling gases are expelled at a rate of 1200 kg/s with a speed of 39700 m/s (at the moment of takeoff).

DO i just multiply? do i have to take gravity into consideration?
 
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Use conservation of energy along with Newton's third law.
 
so i muliply 1200 and 39700 to get the reaction force , that equals 47,640,000. Is that my answer
 

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