Yes I noticed that and clearly the video is wrong there. But not sure whether these videos are just pop science. While there are likely some errors, most of visual effects are really good. Visual effects do help for someone trying to get into it. It also has a video on how magnetic field and...
Probably known in expert worlds but not for novices. Because whatever books I read and YouTube videos I saw, show a stretched disk and balls moving around but no where it dais that specifically. It is hard to visualize that curvature of space will cause an apple to fall, as curvature of Earth is...
I always was confused on how objects fall on Earth due to curvature of space. All I see everywhere is a flat stretched piece of fabric and balls going round and round the central massive ball. But that does not explain anything, how objects actually fall. Finally I saw this video where it...
Why not. If we assume that photon is a train traveling towards you or away from you, the time from that should appear to dilate and length contract from my reference frame, right? Whether it is moving at speed of light or not can be moot. Laws of physics if give you results at 99.999999% speed...
When we say speed of light = c m/s. Who is measuring meters and second. From SR perspective, that photon is moving towards you at speed of light so there should be time dilation, correct?
Thank a lot for your time and post.
I am almost getting it. Can you elaborate a bit more with example how this happens. As I understand every frame can be moving so is the true magnitude of velocity 20 or 60 (Note direction is not changing in this Ex) If I observe change of magnitude how can I...
HI,
I have read about tensors and generally understand the concept. One core thing about Vector/Tensor as I understand it is that its magnitude and direction should not change with change in coordinate system. I get that when I write vector and also when I use matrix transformation.
However...
There is a lot of discussion on this but I still have doubts. Can someone help clarify and point me to correct thread?
Object free falls due to gravity (acceleration) so the frame should be non inertial for outside observer. But object does not experience pseudo force in free fall so it may be...
Thanks for help. I get the explanation for 1 and 2 but not well for 3 as yet. I understand that Einstein Equation has 2 ranks so tensor with 4 ranks won't work however when we started from basics and said that space is curved when the parallel transport returns back in different direction OR...
I have been reading GR but I have these gaps in understanding. Can someone help clear them?
1) SR has a transformation to new co ordinate system that is a linear one. When GR is described, the textbooks mainly discuss Geodesic and distance but I ave not seen the transformation from old to new...
I am very confused about weight training and running as I learn physics. When I run at 6 miles/hr (about 3 m/s) on treadmill for a minutes, I spend more than 10 calories. I believe these are food calories (KCal) so it is 10,000 cal or 10,000*4.18 Joules or approx 50,000 J ie 50KJ
Ok so far so...
I am fully confused by moving at speed of light issue. I see that galaxies are moving away from each other probably into new space that is probably created at edge of universe. What no one talks about it the space in between and everywhere. Space cannot just get created at the edge. It is...
Thanks for replies. As I get it so far:
1) MMX always assumed that speed of light was c in Ether, just like speed of sound in constant in a media. It also assumed that Galileo's relativity was correct.
2) So if Earth moves through it, it will take longer or shorter for it to travel along Ether...
Let us assume that a photon leaves one end of room. Room is moving right at "v" since photon is not acquiring room's velocity, it travels L+vt in forward direction and L-vt in reverse. Since the time is different, it can be detected.
This is same as MM Experiment. I understand that this logic...
I think my point is that if light detached from the box and box moving, it will take more time for it to travel to end and less time when coming back. Speed at which it does should not matter.
Also Whether it is photon or EM wave, they all travel in st lines and diverge so in theory there can...