Classical Mechanics, Double Star, Find the ratio of the masses

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SUMMARY

The discussion focuses on calculating the mass ratio of two components in a double star system, where each star moves in circular orbits around their common center of mass. Participants clarify that the centripetal force acting on each star must be equal, leading to the conclusion that the ratio of their masses can be derived from their respective orbital radii (r1 and r2) and angular velocity (ω). Newton's laws of motion and the law of gravitation are fundamental to solving this problem.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with the law of gravitation
  • Knowledge of centripetal force concepts
  • Basic grasp of angular velocity (ω)
NEXT STEPS
  • Study the derivation of centripetal force equations
  • Learn about the dynamics of binary star systems
  • Explore the application of Newton's laws in celestial mechanics
  • Investigate the mathematical relationship between mass, radius, and angular velocity in orbital systems
USEFUL FOR

Astronomy students, physics enthusiasts, and anyone interested in understanding the dynamics of double star systems and celestial mechanics.

cum
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Homework Statement



The two components of a double star are observed to move in circles of radii r1 and r2. What is the ratio of their masses? (Hint: Write down their accelerations in terms of the angular velocity of rotation, ω.)



Homework Equations


Newton's 2nd law? law of gravitation?


The Attempt at a Solution



I don't know what a double star is and hence I don't know what the system is doing.
 
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welcome to pf!

hi cum! welcome to pf! :smile:
cum said:
I don't know what a double star is and hence I don't know what the system is doing.

a double star is two stars, each moving in a circle round their common centre of mass :wink:
 


tiny-tim said:
hi cum! welcome to pf! :smile:


a double star is two stars, each moving in a circle round their common centre of mass :wink:

Thanks.

Simple enough, all I had to do was let their centripetal force be equal.
 

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