Science question...

iNPUt said:
What? Crash talk I say :D
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Not really, it makes sense; travel fast - you end up nano seconds out of 'sync'. Spend 1000 years on a commercial aeroplane and your 1/1000th of a second younger than you would be had you remained on earth (if you guesstamate with einstiens formula).

When you consider the relative speeds there; it sort of makes sense.


(if going 99.9999% means times going forward and it's hypothesised going faster means it goes backwards, if this was proved correct, does that mean if you travel exactly at the speed of light time freezes!?!
 
"As of 2008, the man with the longest time in space is Sergei K. Krikalev, who has spent 803 days, 9 hours and 39 minutes, or 2.2 years, in space" (Just Google/wiki searched:))

So this chap would be maybe 2 nano-milli-seconds younger when he returned to earth?
Or vice versa, earth is 2 nano-milli-seconds older?

Edit: I guess that why it's called relativity? ;)
 
DAnDan said:
You wouldn't turn into a blue or red wave yourself, but to someone observing you, your colour would change due to red-shift. If you are moving away from some observer, you would appear to be more red than you actually are, and if you're moving towards then, you'd appear more blue. It's basically the Doppler effect, but with light, not sound.
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Yes, sorry that's what I meant to express (typing from my iPod here; not too easy to see what I've typed/not typed).

.
 
JayMax said:
Ok, (genuine question) is this myth or not: a ship that circumnavigates the globe, with a clock on the top of the mast and a clock on the deck. Do they read different times after 1 trip around the world?
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They would read different times if the two clocks were spectacularly accurate. Time dilation applies at any relative velocity, but its effects are infinitesimal until you get to huge velocities.
 
p0ss3s3d said:
(if going 99.9999% means times going forward and it's hypothesised going faster means it goes backwards, if this was proved correct, does that mean if you travel exactly at the speed of light time freezes!?!
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Any time spent at the speed of light = Inifite time to everyone not at the speed of light.
 
DAnDan said:
And gravity
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the differences in speed and gravity both have an effect - but they have opposite effects to each other.

Higher speed = slower time.
Lower gravity = faster time.

so the two effects work against each other.

(i think)
 
I'm sure they've already done the "2 atomic clocks, 1 one a plane going around the world & one static" in the '70s (sure the plane was a 707) and there was a very miniscule difference (nano seconds or less). We did a physics class were they showed the news footage of it.

EDIT - It was in the Experimental confirmation part of this link - http://en.wikipedia.org/wiki/Gravitational_time_dilation#Experimental_confirmation
 
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touch said:
the differences in speed and gravity both have an effect - but they have opposite effects to each other.

Higher speed = slower time.
Lower gravity = faster time.

so the two effects work against each other.

(i think)
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If you are in the presents of high gravity, time will slow down for you in relation to others. so it in fact speeds up time, in relation to others.

Lower gravity = slower time in relation to others who are at a higher gravity.
 
JayMax said:
Ok, (genuine question) is this myth or not: a ship that circumnavigates the globe, with a clock on the top of the mast and a clock on the deck. Do they read different times after 1 trip around the world?
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all the ship travels at the same speed so they will be the same? both clocks may be different to someone on earths clock assuming the ship fast enough and the clocks were acurate enough...
 
Angilion said:
They would read different times if the two clocks were spectacularly accurate. Time dilation applies at any relative velocity, but its effects are infinitesimal until you get to huge velocities.
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surely the clocks travel at the same speed due to being on a ship? (I assume this I don't know)
 
edscdk said:
surely the clocks travel at the same speed due to being on a ship? (I assume this I don't know)
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Due to the curve of the earth, the clock at the top of the mast will travel further in the same time. (So therefor it is travelling faster)
 
touch said:
Due to the curve of the earth, the clock at the top of the mast will travel further in the same time. (So therefor it is travelling faster)
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but relitave to each other they are traveling the same speed? so both clocks will stay in sync?

hang on but relative to someone on earth the bottom one is going at a different speed to the top one...

head explodes...
 
edscdk said:
but relitave to each other they are traveling the same speed? so both clocks will stay in sync?

hang on but relative to someone on earth the bottom one is going at a different speed to the top one...

head explodes...
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Nope, they'll not be at the same speed relative to each other. As said, the one on the mast has a greater circumference to travel round than the clock on the boat itself, therefore it's speed is higher. If the boat was travelling along a straight line however, both clocks would be travelling at the same speed.

Something that may interest some of you, there's been calculations to work out how a clock placed at the very centre of the earth would experience time, in relation to a clock on earth's surface. The effect is a time difference of about 22 milliseconds per year, so not much, but it's something.

http://en.wikipedia.org/wiki/Geocentric_Coordinate_Time
 
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