Mass of the rocket doesnt stay constant

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    Constant Mass Rocket
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SUMMARY

The discussion centers on the complexities of rocket physics, specifically the non-constant mass of rockets during flight. Key factors include the varying weight of fuel across three stages: takeoff, level flight, and descent. Additionally, the principles of relativity, which state that mass increases with speed, and the effects of thrust direction on size are mentioned. However, it is noted that conservation of momentum may be the primary focus for the class, rather than relativity.

PREREQUISITES
  • Understanding of rocket stages: takeoff, level flight, descent
  • Basic principles of conservation of momentum
  • Familiarity with relativity concepts, particularly mass-energy equivalence
  • Knowledge of fuel consumption dynamics in rocketry
NEXT STEPS
  • Research the principles of conservation of momentum in rocketry
  • Study the effects of fuel weight on rocket performance during different flight stages
  • Explore relativity and its implications for high-speed objects
  • Learn about the physics of thrust and its impact on rocket design
USEFUL FOR

Students in physics courses, aerospace engineering enthusiasts, and anyone interested in understanding the dynamics of rocket flight and mass variation.

spri4
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My physics class is ending the year with the study of rockets. He said it will be one of the most difficult studys of physics because the mass of the rocket doesn't stay constant. What do you think? Any hints/tips you would like to share? Thank you.
 
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Hints? Tips? ummmmmmmm... PAY ATTENTION ;)

But seriously it shouldn't be that hard, you just have to factor in how much weight in fuel the rockets are averaging over 3 stages in flight (take off, level flight, descent) as each will be different. But, then we should also remember relativity, which states that mass increases as speed increases, and that size (in the direction of thrust) also becomes smaller.
 
AzonicZeniths said:
Hints? Tips? ummmmmmmm... PAY ATTENTION ;)

But seriously it shouldn't be that hard, you just have to factor in how much weight in fuel the rockets are averaging over 3 stages in flight (take off, level flight, descent) as each will be different. But, then we should also remember relativity, which states that mass increases as speed increases, and that size (in the direction of thrust) also becomes smaller.

I don't think relativity will be in this class
 
Use conservation of momentum.
 

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