A Twin Paradox Question, totally lost.

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SUMMARY

The discussion centers on the twin paradox scenario involving Anna and Bob, where Anna travels to planet W at 0.6c and returns. Upon her return, Bob is 60 years old while Anna is 52 years old. The calculations utilize Lorentz contraction to determine the perceived distances and times experienced by both characters. Specifically, the total distance traveled by Anna is calculated to be 19.2 light-years, resulting in her aging less than Bob due to the effects of time dilation at relativistic speeds.

PREREQUISITES
  • Understanding of special relativity concepts, particularly time dilation and length contraction.
  • Familiarity with Lorentz transformations and their application in relativistic physics.
  • Basic knowledge of the speed of light (c) and its significance in physics.
  • Ability to perform calculations involving relativistic speeds and distances.
NEXT STEPS
  • Study the principles of Lorentz contraction in more detail.
  • Learn about time dilation effects in special relativity using real-world examples.
  • Explore the mathematical derivation of the twin paradox and its implications.
  • Investigate other relativistic scenarios and their outcomes, such as the Doppler effect at high speeds.
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding the implications of special relativity, particularly in relation to time travel and the twin paradox scenario.

Engineergirl2
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Homework Statement



Planet W is 12ly from earth. Anna and Bob are both 20 years old. Anna travels to planet W at 0.6c, quickly turns around, and returns to Earth at 0.6c. How old will Anna and Bob be when Anna gets back?



Homework Equations





The Attempt at a Solution



I've tried so many things and nothing is working. Apparently Bob is 60 years and Anna is 52 years. I'm completely lost on the idea of twin paradoxes, I could use some serious help. Thank you!
 
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Can you see why it is 60 years for Bob?

For Anna, the distance to W and back is Lorentz-contracted.
 
B/c 24cyrs/0.6c is equal to forty. Therefore you add them and get 60. Then, Anna is 52 years because the total distance that she appears to travel is 19.2? And 19.2cyrs/0.6c is equal to 32. add that to20 and you get 52. I ended up using length contraction. Sorry that was actually pretty easy!
 

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