Misconceptions about length contraction

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Homework Help Overview

The discussion revolves around the concept of length contraction in the context of general relativity and its implications for traveling vast distances in space. Participants explore whether the universe can contract around a spaceship, making interstellar distances manageable within a short time frame.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants question the validity of length contraction as described in general relativity, with some suggesting a need to start with special relativity. There are inquiries about the practical implications of traveling close to the speed of light and how it affects perceptions of time and distance.

Discussion Status

Some participants provide affirmations regarding the effects of traveling at high speeds on length contraction, while others express uncertainty about the practical aspects of such travel. The conversation reflects a mix of interpretations and attempts to clarify the concepts involved.

Contextual Notes

There is a mention of a quiz on misconceptions about general relativity, which may influence participants' understanding and assumptions about the topic. Additionally, the nature of the problem is questioned regarding its appropriateness for a K-12 audience.

delton
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Could someone please, briefy explain length contraction under general relativity?? Is it possibly for the universe to contract around a spaceship so that the distances between stars become only inches.. and thus it becomes possible to reach stars lightyears away in very little time?


THe quiz "misconceptions on general relativity" on this site seems to support this, but is it true?? :confused:
 
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delton said:
Could someone please, briefy explain length contraction under general relativity?? Is it possibly for the universe to contract around a spaceship so that the distances between stars become only inches.. and thus it becomes possible to reach stars lightyears away in very little time?


THe quiz "misconceptions on general relativity" on this site seems to support this, but is it true?? :confused:

you sure this is a k-12 problem? :-p
 
If I were you I'd start with special relativity, which also predicts length contraction. I am not a physicist or a moderately intelligent person; and I feel as if I am lightyears away from the outermost circle of Gen. Rel. -- except when I am moving very, very fast. :smile:
 
Yes, it is true. If you are moving very fast- very close to the speed of light relative to some "stationary" place, youcan get from one star to another quickly.
 
HallsofIvy said:
Yes, it is true. If you are moving very fast- very close to the speed of light relative to some "stationary" place, youcan get from one star to another quickly.

Does that mean that in practical terms, it doesn't make much difference if the object cannot reach the speed of light?
 
Depends on what you mean by "practical". If an astronaut could fly at 90% the speed of light, he could fly to proxima centauri and back in only a few hours, relative to himself. However, to his wife and kids, the round trip would take more than 10 years!
 
Thanks guys, I just wanted some basic confirmation on this, and not anything too advanced...
 

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