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-   -   basics of relativity (https://www.mersenneforum.org/showthread.php?t=14171)

science_man_88 2010-11-21 01:57

I think i semi get tensors but I'm not sure as I may be misinterpreting [url]http://en.wikipedia.org/wiki/File:Components_stress_tensor_cartesian.svg[/url]

CRGreathouse 2010-11-21 05:14

[QUOTE=science_man_88;237936]for example if m[SUB]0[/SUB]=1 and m=12 then v= 99.65% light speed I think. if we don't want to be pushed back into our seat maybe we can figure out a mass etc that will make a gravitational field strong enough to counteract the extra g-force equivalent. however it still has a ways to go I guess,we have until 2100 I believe.[/QUOTE]

It's all about acceleration, not speed.

science_man_88 2010-11-21 12:12

[QUOTE=CRGreathouse;238071]It's all about acceleration, not speed.[/QUOTE]

12g yes but 12 *mass constantly = about 99.65% speed of light in the equation I have for mass increase.

science_man_88 2010-11-21 15:01

[QUOTE=science_man_88;238056]I think i semi get tensors but I'm not sure as I may be misinterpreting [url]http://en.wikipedia.org/wiki/File:Components_stress_tensor_cartesian.svg[/url][/QUOTE]


by what it shows it's almost like tensors represent in simple terms something like vector(c,n) could in Pari.

science_man_88 2010-11-21 17:35

[QUOTE=science_man_88;238096]by what it shows it's almost like tensors represent in simple terms something like vector(c,n) could in Pari.[/QUOTE]

does* in Pari. Sorry I messed it up and forgot case.

science_man_88 2010-11-21 19:58

Am I partially correct?

CRGreathouse 2010-11-21 20:44

[QUOTE=science_man_88;238084]12g yes but 12 *mass constantly = about 99.65% speed of light in the equation I have for mass increase.[/QUOTE]

Mass will be measured differently by different observers. The travelers won't perceive themselves to be any more massive than usual (though they'll weigh 12 times more if accelerating at 12 g).

davieddy 2010-11-22 15:05

I feel as if I am in a lift whose cable has hroken
 
Weightless, and expect to hit the floor any minute.

QUOTE=CRGreathouse;238071]It's all about acceleration, not speed.[/QUOTE]

David

jasong 2010-11-27 03:53

From the perspective of the people in the spaceship, how long would it take to get to light speed at 1 g of acceleration?

(nm, I'll google it and come back.)

Edit: About 354 days and 1.5 hours.

science_man_88 2010-11-27 12:54

[QUOTE=jasong;238834]From the perspective of the people in the spaceship, how long would it take to get to light speed at 1 g of acceleration?

(nm, I'll google it and come back.)

Edit: About 354 days and 1.5 hours.[/QUOTE]

Really? I get 353 days 19 hours 45 minutes and about 23 seconds if I don't compensate for relativity.

Mini-Geek 2010-11-27 14:35

[QUOTE=jasong;238834]From the perspective of the people in the spaceship, how long would it take to get to light speed at 1 g of acceleration?

(nm, I'll google it and come back.)

Edit: About 354 days and 1.5 hours.[/QUOTE]

Wouldn't it take an infinite amount of energy or time to accelerate to light speed, from any perspective?


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