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Author Topic: Build a time machine  (Read 828 times)

Offline Meatwad

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« on: May 10, 2005, 05:11:34 PM »
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Offline NUKE

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« Reply #1 on: May 10, 2005, 05:24:01 PM »
Quote
The effect is often described using the "twin paradox." Suppose that Sally and Sam are twins. Sally boards a rocket ship and travels at high speed to a nearby star, turns around and flies back to Earth, while Sam stays at home. For Sally the duration of the journey might be, say, one year, but when she returns and steps out of the spaceship, she finds that 10 years have elapsed on Earth


Okay, I'm pretty stupid when it comes to time and relativity. I know that events are relative to when you are observing them from, but what about the above statement.

Sally is in a rocket traveling at high speed. She go to a star and comes back, while on Earth ten years have gone by.

Ten revolutions of the earth have gone by for Sally too, no matter that she was traveling at high speed or not. So for Sally, didn't the same amount of time go by for her? Ten revolutions of the earth went by for her too, didn't it?

Or what is sally measuring time by?
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Offline deSelys

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« Reply #2 on: May 10, 2005, 05:26:35 PM »
Time slowed down for her so she only aged 1 year during those ten revolutions.
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Offline SageFIN

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« Reply #3 on: May 10, 2005, 05:28:44 PM »
Quote
Originally posted by NUKE
Ten revolutions of the earth have gone by for Sally too, no matter that she was traveling at high speed or not. So for Sally, didn't the same amount of time go by for her? Ten revolutions of the earth went by for her too, didn't it?

Or what is sally measuring time by?


Sally would see the Earth's revolution speed up. See for some good reading.
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Offline rpm

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« Reply #4 on: May 10, 2005, 05:32:17 PM »
Consume 1 quart rapidly. 24 hours will pass in the blink of an eye.
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Offline Tumor

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« Reply #5 on: May 10, 2005, 05:36:36 PM »
It's all a lie.  Fantasy I tell ya.  Your better off trying to turn lead into gold! :rofl
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Offline NUKE

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« Reply #6 on: May 10, 2005, 05:44:51 PM »
Quote
Originally posted by deSelys
Time slowed down for her so she only aged 1 year during those ten revolutions.


But that's what I don't understand ( like I said, I'm stupid about the subjecty)

The earth went through ten rotations either way, so that's ten years relative to the earth's rotation for Sally and for her brother on earth both, right?
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Offline WMLute

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« Reply #7 on: May 10, 2005, 05:46:20 PM »
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Originally posted by NUKE
Okay, I'm pretty stupid when it comes to time and relativity. I know that events are relative to when you are observing them from, but what about the above statement.

Sally is in a rocket traveling at high speed. She go to a star and comes back, while on Earth ten years have gone by.

Ten revolutions of the earth have gone by for Sally too, no matter that she was traveling at high speed or not. So for Sally, didn't the same amount of time go by for her? Ten revolutions of the earth went by for her too, didn't it?

Or what is sally measuring time by?


actually, you stumbled upon a good question nuke.

is time a measurement, or is it a force?

I.E. is time merely a unit of measure we have agreed upon, or is it, like gravity, a force that can be manipulated.
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Offline Gh0stFT

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« Reply #8 on: May 10, 2005, 05:50:20 PM »
gravity slows time.

Speed slows time.

but we talk about light speed here, not 200mph! ;)
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Offline Holden McGroin

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« Reply #9 on: May 10, 2005, 06:00:09 PM »
There are reports that Glenn Seaborg, 1951 Nobel Laureate in Chemistry, succeeded in transmuting a minute quantity of lead (possibly en route from bismuth, in 1980) into gold. There is an earlier report (1972) in which Soviet physicists at a nuclear research facility near Lake Baikal in Siberia accidentally discovered a reaction for turning lead into gold when they found the lead shielding of an experimental reactor had changed to gold.

As far as time dialation and the speed of light, envision two vectors at right angles to each other, one representing the your speed thru the volume of space, the other representing your speed thru the temporal dimension, time.

The addition of these two vectors = the speed of light.

By Pythagorus,
speed thru space squared + speed thru time sqared = speed of light squared.  (C squared sounds oddly familiar...)

The faster you go in one direction, the slower you are traveling in the other so that your speed thru spacetime is always "C".
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Offline Darkish

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« Reply #10 on: May 10, 2005, 06:05:39 PM »
ooops - see Sage's comment below (sry is late)
« Last Edit: May 10, 2005, 06:24:49 PM by Darkish »
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Offline eskimo2

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« Reply #11 on: May 10, 2005, 06:11:11 PM »
Quote
Originally posted by NUKE
But that's what I don't understand ( like I said, I'm stupid about the subjecty)

The earth went through ten rotations either way, so that's ten years relative to the earth's rotation for Sally and for her brother on earth both, right?


If it were possible for us to watch Sally, she would seem to be in slow motion, 1/10th speed.  Everything about her and her ship would seem to be in slow motion.  
If she could watch us, we would seem to be in fast motion.  She could see us go through an entire day in 2.4 hours.  She probably wouldn't be able to comprehend much though.

eskimo
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Offline NUKE

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« Reply #12 on: May 10, 2005, 06:13:36 PM »
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Originally posted by Darkish
The thing is Nuke, that for the girl in the ship the Earth went round the sun only once.. is all relative see.


I don't get it. What if she had a super telescope and watched the earth's rotation and traveled away at the speed of light. She observes the earths physical rotation and times her return to coincide with one rotataion. One physical rotation.

How could the the earth have rotated more than one time for the people on earth as well? Or did she not see the other rotations?

That's what I'm getting at, time as measured by the rotation of the earth for both people. How could they be different?
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Offline slimm50

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« Reply #13 on: May 10, 2005, 06:16:04 PM »
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Originally posted by rpm
Consume 1 quart rapidly. 24 hours will pass in the blink of an eye.

RPM's got the truth of it, I tell ya.
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Offline Pongo

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« Reply #14 on: May 10, 2005, 06:16:07 PM »
In any way that she can experiance or measure time one year has passed. She traveled one year in time and her brother traveled 10 years. Time is relative to the situation that each is in.

as it said in the article. This can allready be demonstrated  for changes in time that are not very usefull. The speeds required to make it interesting are not within our abilities yet I think.
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