These lectures should be everywhere! I won't say thank you for your efforts. This is because I see clearly how skilled a physicist you are and how easy and intuitive all of this seems to you, that you can present it without any significant effort. Nevertheless, thanks for giving us these wonderful lectures, sir.
The Barn Door Paradox The setting out of the barn door paradox (14:40) would be a lot simpler starting with the back doors of the barns on the right and left halves of the diagram closed at the start, as in the previous hand drawn sequence, and remaining closed until the front of the ladder gets there. At this point the back door snaps open. At that same time the front door on the left half of the diagram snaps shut. The one on the right half has to wait until the ladder has cleared before shutting. Each door then only undergoes one event (opening for the back door and shutting for the front one). At 19:00 you clearly explain that the fallacy in the apparent paradox is the assumption that the two barn doors both move in tandem in the two frames. In fact, an observer on the ladder does not see the two barn door moves as simultaneous. The back door move is first and the front door follows. However, at 26:00 you don't close the loop by spelling out that in the primed (ladder) frame of reference the two door events occur at different times. You focus instead on the length of the ladder, which is the source of people's confusion. In the ladder frame the back door move is the rightmost red dot. The front door move is an event at the intersection of the left blue vertical with the x'=0 axis, which is some time later (if I understand this correctly, which is by no means a given). This is why the ladder gets through without mishap. A couple of other points on this sequence: 1. It is not clear why the black x=ct line is there. Presumably it is explained in an earlier lecture, and might have something to do with how the x' (i.e. ct'= 0 line) is drawn. 2. At 24:05, it is not obvious why B is shorter than Bo as it is clearly longer on the diagram. Presumably, the length units of x and x' must be different. i.e. 1 metre on the x' axis is not the same length on this diagram as 1 metre on x. Thanks for the video. It certainly got me thinking. Whether along the right lines or not I will leave to others.
The paradoxes are actual contradictions that indicate that the principle of relativity is false. The Einstein mathematics is faulty and produces mathematical contradictions that can not be removed. So his theory is actually invalid as shown by these real unresolvable paradoxes.
These lectures should be everywhere!
I won't say thank you for your efforts. This is because I see clearly how skilled a physicist you are and how easy and intuitive all of this seems to you, that you can present it without any significant effort. Nevertheless, thanks for giving us these wonderful lectures, sir.
Glad you like them!
The Barn Door Paradox
The setting out of the barn door paradox (14:40) would be a lot simpler starting with the back doors of the barns on the right and left halves of the diagram closed at the start, as in the previous hand drawn sequence, and remaining closed until the front of the ladder gets there. At this point the back door snaps open. At that same time the front door on the left half of the diagram snaps shut. The one on the right half has to wait until the ladder has cleared before shutting. Each door then only undergoes one event (opening for the back door and shutting for the front one).
At 19:00 you clearly explain that the fallacy in the apparent paradox is the assumption that the two barn doors both move in tandem in the two frames. In fact, an observer on the ladder does not see the two barn door moves as simultaneous. The back door move is first and the front door follows.
However, at 26:00 you don't close the loop by spelling out that in the primed (ladder) frame of reference the two door events occur at different times. You focus instead on the length of the ladder, which is the source of people's confusion.
In the ladder frame the back door move is the rightmost red dot. The front door move is an event at the intersection of the left blue vertical with the x'=0 axis, which is some time later (if I understand this correctly, which is by no means a given). This is why the ladder gets through without mishap.
A couple of other points on this sequence:
1. It is not clear why the black x=ct line is there. Presumably it is explained in an earlier lecture, and might have something to do with how the x' (i.e. ct'= 0 line) is drawn.
2. At 24:05, it is not obvious why B is shorter than Bo as it is clearly longer on the diagram. Presumably, the length units of x and x' must be different. i.e. 1 metre on the x' axis is not the same length on this diagram as 1 metre on x.
Thanks for the video. It certainly got me thinking. Whether along the right lines or not I will leave to others.
The paradoxes are actual contradictions that indicate that the principle of relativity is false. The Einstein mathematics is faulty and produces mathematical contradictions that can not be removed. So his theory is actually invalid as shown by these real unresolvable paradoxes.
Nope. Try actually watching the video!