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Gravity detector could provide clues to the shape of the universe
St. Louis Post-Dispatch ^
| Monday, January 8, 2007
| Eric Hand
Posted on 01/09/2007 12:19:17 AM PST by SunkenCiv
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Washington University physicist Ram Cowsik, left, and Kasey Wagoner discuss the mirrors they are testing with a high-precision camera that will be part of a force detector. (Noah Devereaux/P-D)
1
posted on
01/09/2007 12:19:19 AM PST
by
SunkenCiv
To: AdmSmith; bvw; callisto; ckilmer; dandelion; FairOpinion; ganeshpuri89; gobucks; KevinDavis; ...
2
posted on
01/09/2007 12:20:29 AM PST
by
SunkenCiv
("I've learned to live with not knowing." -- Richard Feynman)
To: SunkenCiv
3
posted on
01/09/2007 12:35:31 AM PST
by
pissant
To: SunkenCiv
4
posted on
01/09/2007 4:23:05 AM PST
by
martin_fierro
(Not Legal for Trade)
To: SunkenCiv
I got me qa gravity detector - If I drop an apple, and iit falls to teh ground, yep. there's gravity.
all kidding aside, gravity is faster than light.
5
posted on
01/09/2007 7:37:47 AM PST
by
camle
(keep your mind open and somebody will fill it full of something for you)
To: martin_fierro
I have one of those. I get the weight, then step off before it completes the "per cent of body fat" exam.
6
posted on
01/09/2007 10:12:44 AM PST
by
SunkenCiv
("I've learned to live with not knowing." -- Richard Feynman https://secure.freerepublic.com/donate/)
To: pissant
Wow, that was a trip into the Wayback Machine...
7
posted on
01/09/2007 10:13:22 AM PST
by
SunkenCiv
("I've learned to live with not knowing." -- Richard Feynman https://secure.freerepublic.com/donate/)
To: camle
8
posted on
01/09/2007 10:15:31 AM PST
by
SunkenCiv
("I've learned to live with not knowing." -- Richard Feynman https://secure.freerepublic.com/donate/)
To: SunkenCiv
9
posted on
01/09/2007 10:19:19 AM PST
by
camle
(keep your mind open and somebody will fill it full of something for you)
To: SunkenCiv
10
posted on
01/09/2007 5:41:25 PM PST
by
lesser_satan
(EKTHELTHIOR!!!)
To: SunkenCiv
What is causing the universe to fly apart, faster and faster each year?
Republicans caving to Democrats.
11
posted on
01/09/2007 5:42:59 PM PST
by
azhenfud
(The fool hath said in his heart, There is no God.)
To: camle
all kidding aside, gravity is faster than light. Know its been over a week since you posted this, but I'll bite. How is gravity faster than light?
12
posted on
01/18/2007 4:44:00 AM PST
by
EarthBound
(Ex Deo, gratia. Ex astris, scientia)
To: EarthBound
if gravity was lightspeed or slower, then the gravitational pull of the sun on the earth would be slightly out of sync with the earth's location, and our orbit would be a outward spiral. we'd be long gone.
13
posted on
01/18/2007 5:10:14 AM PST
by
camle
(keep your mind open and somebody will fill it full of something for you)
To: camle; EarthBound
So, do we fall at the speed of gravity? :-)
To: Larry Lucido
nope. we fall at a rate determined by atmospheric conditions, limited by resistance, terminal velocity, etc..
15
posted on
01/18/2007 5:16:48 AM PST
by
camle
(keep your mind open and somebody will fill it full of something for you)
To: SunkenCiv
The Theory of Gravitation Made Simple:
Everything in the universe sucks.
To: camle
if gravity was lightspeed or slower, then the gravitational pull of the sun on the earth would be slightly out of sync with the earth's location, and our orbit would be a outward spiral. we'd be long gone. Experiments suggest that the abberation you allude to is resolved by electromagnetic forces in the system. Evidence suggests that the speed at which gravity propogates is between 80% and 120% of c. Indeed experimentations suggest the number is equal to c within 1%. Link below.
Link
17
posted on
01/18/2007 5:43:11 AM PST
by
EarthBound
(Ex Deo, gratia. Ex astris, scientia)
To: TheyConvictedOglethorpe
Sure seems that way some times. :')
18
posted on
01/18/2007 9:27:58 AM PST
by
SunkenCiv
("In theory, theory and practice are the same, but in practice, they're not." -- John Rummel)
To: EarthBound; camle
Thanks for that link. Here's
something else from that site:
Is gravity itself a fictitious force?
A few lines up, I wrote that the force we feel when the bus is braking, is weird in that its strength is proportional to our own mass. But what about gravity? That also has a strength that is proportional to our mass! Could gravity be a fictitious force too?
Yes, that's exactly how gravity is viewed these days. This is the content of Einstein's General theory of Relativity. Einstein conjectured that perhaps we've been looking at things in the wrong way. Newton viewed the orbit of a satellite, or the parabolic flight of a projectile, or the fall of an apple, to be complicated motions caused by the action of this mysterious force called gravity. But Einstein turned the problem on its head, and decided that satellites, projectiles, and apples are all following a motion that is as simple as any motion can be, provided they are viewed on the stage of a curved spacetime.
19
posted on
01/18/2007 9:40:11 AM PST
by
SunkenCiv
("In theory, theory and practice are the same, but in practice, they're not." -- John Rummel)
To: SunkenCiv
Hmm, interesting. I did a quick search of the "speed of gravity" in wikipedia to back up my assertion that gravity, such as it is, propogates at
c.
Thanks for the pings, I love theoretical physics... too bad I never could handle the math.
20
posted on
01/18/2007 10:51:40 AM PST
by
EarthBound
(Ex Deo, gratia. Ex astris, scientia)
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