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

[bodhi]

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.

 

[DaveC426913]

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.

 

[nitsuj]

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 :)

 

[ZealScience]

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.

 

[DaveC426913]

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.

 

[nitsuj]

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).

 

[bodhi]

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