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August 28
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Portland, OR

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02-16-2020 09:44 PM
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### 27 Likes

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1. AndrewC liked post by Janus On thread : How to solve the contradiction in special relativity?
The ground and GPS clocks only have to be synchronized with each other as measured in the ground frame. It is not necessary for the GPS clocks to be synchronized with each other in the frame of any...
Liked On: 07-25-2019, 04:29 PM
2. flopper liked post by Janus On thread : Special Relativity Primer
I've noticed that there is a lot of variation in some of the "explanations" of Special Relativity I've seen and it can be confusing to some. Therefore, I thought I'd try to clear up some of the...
Liked On: 05-20-2019, 02:36 PM
3. lesaid liked post by Janus On thread : Variation on the 'twin paradox' with no change of frame?
But according the the far off free fall observer, the ship is constantly changing its relative velocity, and thus is constantly shrinking in length due to length contraction. ( if it started at 0...
Liked On: 06-07-2018, 07:44 AM
4. AndrewC liked post by Janus On thread : Gravity Assist and Angles
Here you go: Orbits - Gravitational Assist from Planets (http://www.bogan.ca/orbits/gravasst/gravasst.html)
Liked On: 05-30-2018, 03:52 PM
5. Zlatan Stojanovic liked post by Janus On thread : Energy-momentum relation question?
If r = gamma, and gamma= 1/sqrt(1-v^2/c^2), then what happens to gamma if v=c? It reduces to 1/0. But 1/0 is undefined. Anything with a non-zero rest mass can never achieve a velocity of c. ...
Liked On: 05-12-2018, 06:11 AM
The estimated maximum mass for a neutron star is ~3.2 solar masses and would have a radius of ~18 km. The Schwarzchild radius for an object of that mass is 9.44 km. So what happens if you add...
Liked On: 03-04-2018, 08:38 PM
7. Strange liked post by Janus On thread : Parallax
It probably has something to do with the fact the the parallax of a 4.22 ly distant star is in the order of .78 arcsec, which is over twice that of the La Silla telescope resolution. Then add in the...
Liked On: 08-23-2017, 03:46 PM
8. btr liked post by Janus On thread : "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!
Okay, let's pick up where we left off. Instead of a fixed distance, we'll assume a fixed time. To maintain momentum in our example for a given time, we need to work out what distance is...
Liked On: 10-10-2014, 01:39 PM
9. btr liked post by Janus On thread : "Regaining momentum takes three times as much energy as sustaining momentum" - explanation please!
Your proof doesn't address the question asked. The question dealt with comparing the energy needed to "maintain" momentum, vs. that to regain lost momentum. So the first question becomes: ...
Liked On: 10-10-2014, 01:39 PM
10. pikpobedy liked post by Janus On thread : Effects of Earth's rotataion on a simple experiment
In a no air environment, I get 24mm for the Equator scenario under "real" conditions. Here's the basic steps: Upon release, the object follows an elliptical trajectory with the Earth's center at...
Liked On: 09-23-2014, 04:37 PM
11. MaxPayne liked post by Janus On thread : What is dark matter make of?
3) a combination of 1 and 2. But even then there is an upper limit to how much can be attributed to 2. If the total matter of baryonic matter in the universe was much greater than that which...
Liked On: 08-28-2014, 06:12 AM
12. Scheuerf liked post by Janus On thread : Time Differences from Far Distances
What he is referring to is an aspect of Relativity called the Relativity of Simultaneity. It means that frames in relative motion with respect to each other will not agree on what is simultaneous....
Liked On: 08-23-2014, 04:44 PM
13. x0x liked post by Janus On thread : Time Differences from Far Distances
What he is referring to is an aspect of Relativity called the Relativity of Simultaneity. It means that frames in relative motion with respect to each other will not agree on what is simultaneous....
Liked On: 08-23-2014, 04:28 PM
14. Jilan liked post by Janus On thread : How come Light can not escape a Black hole
Basically what it comes down to is that the term "relativistic mass" has fallen out of favor. Instead, we just cut to the chase and call it 'energy'. 'Mass' means what used to be called "rest...
Liked On: 08-04-2014, 06:28 PM
15. Jilan liked post by Janus On thread : Special case of SR, where two clocks accelerate equally, but end up displaying different times
For a little more illumination on this, here are the space-time diagrams for both the K and K' frames. http://home.earthlink.net/~parvey/sitebuildercontent/sitebuilderpictures/st4.gif
Liked On: 08-03-2014, 06:23 AM
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