If we go to space with the speed of 40000 km/hr and spend almost 5 yrs

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Discussion Overview

The discussion revolves around the effects of traveling in space at a speed of 40,000 km/hr for five years, specifically regarding time dilation experienced by the traveler compared to time elapsed on Earth. The conversation touches on concepts from both special relativity and gravitational time dilation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants argue that at a speed of 40,000 km/hr, the time dilation experienced would be negligible, suggesting that the traveler would age similarly to those on Earth.
  • Others propose that gravitational time dilation, due to being in a lower gravity field, could have a more significant impact on the aging process of the traveler compared to the effects of speed.
  • A later reply questions the relevance of gravitational time dilation in this scenario, emphasizing that the speed mentioned does not lead to significant relativistic effects.
  • Some participants note that even if the traveler were to experience some time dilation, it would be minimal and not noticeable over the five-year period.
  • One participant suggests that the traveler might be cognitively "quicker" due to spending time in a weaker gravitational field, although this idea remains speculative.
  • There is a mention that if the traveler were to go far enough from Earth, the gravitational effects could be more pronounced, but this depends on the specifics of the journey.

Areas of Agreement / Disagreement

Participants express differing views on the significance of time dilation effects due to speed versus gravitational influences. While some agree that the speed is too low for noticeable relativistic effects, others highlight the potential impact of gravitational time dilation, leading to an unresolved discussion.

Contextual Notes

Limitations include the lack of specific details regarding the distance from Earth during the journey and the assumptions about the effects of gravity versus speed on time dilation. The discussion does not resolve the interplay between these factors.

bodhi
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if we go to space with the speed of 40000 km/hr and spend almost 5 yrs in space how much time will pass by when we return on earth,will we enter into future compared to time that must have past otherwise on Earth if we had been on earth.
 
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bodhi said:
if we go to space with the speed of 40000 km/hr and spend almost 5 yrs in space how much time will pass by when we return on earth,will we enter into future compared to time that must have past otherwise on Earth if we had been on earth.
In your scenario, there will be no noticeable change. You would age the same on Earth as in space to within many decimals.

Your speed is way too slow to be relativistic. At 1/480th the speed of light, your dilation factor will be one followed by several zeros.
 
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bodhi said:
if we go to space with the speed of 40000 km/hr and spend almost 5 yrs in space how much time will pass by when we return on earth,will we enter into future compared to time that must have past otherwise on Earth if we had been on earth.

Having left a high gravity region for a low gravity region and spending 5 years in the low gravity region would have a far greater impact on time then traveling at 40k/hour.

"Time speeds up" in weaker gravity fields, so that space traveller would age faster then those on earth. I think that's pretty much right.

So, hanging out in a weaker gravitational field then Earth is a waste of (earth) "time". However the spaceman maybe cognitively "quicker" for those on Earth :)
 
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Too slow! The time dilation is even smaller than gravitational time dilation! You'd rather stay few more hundred kilometers from Earth in order to get the same dilation.
 


I didn't bother mentioning gravitational time dilation since the OP did not mention how far away form Earth he planned to go; he only mentions a velocity. (If he goes 40,000km/h for only ten seconds, he'll still be well within Earth's well).

Regardless, climbing out of Earth's gravity well still has a miniscule effect on the passage of time.
 


DaveC426913 said:
I didn't bother mentioning gravitational time dilation since the OP did not mention how far away form Earth he planned to go; he only mentions a velocity. (If he goes 40,000km/h for only ten seconds, he'll still be well within Earth's well).

Regardless, climbing out of Earth's gravity well still has a miniscule effect on the passage of time.


Pointing out the impact of gravity is a moot point to the OP. Your first post was a perfect answer.

I added the gravity part because I have found it equaly interesting to SR, perhaps the poster will explore gravity time dilation as well.

After a second reading, the way the OP is worded, it looks to me as if they are asking if the spaceman will have traveled to the future compared to Earth. If that is what was aksed, I'd have to say yes the spaceman has traveled into the future (from gravity time dilation, since the spaceman would be older then if they just stayed on Earth).
 
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DaveC426913 said:
In your scenario, there will be no noticeable change. You would age the same on Earth as in space to within many decimals.

Your speed is way too slow to be relativistic. At 1/480th the speed of light, your dilation factor will be one followed by several zeros.

thanks a lot sir
 

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