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Post by rmc on Jun 4, 2017 2:22:09 GMT
Sorry. My video, which is supposed to be a brief overview, ended up being 15 minutes. If you can manage to devote that sort of time to it, suggestions and comments to help me improve this opening overview to the inspiration behind Special Relativity would be appreciated. I know I slipped up a couple of times and said some things not quite as I intended. It would probably be helpful to get input on it all at this point and then set out to do it again with all the corrections ( as long as I somehow manage to actually say the suggested corrections ) I thought of posting this here specifically because I know people will tell me what they really think AND that the things that they say will more than likely be completely correct too!  |
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Post by silverdragon on Jun 4, 2017 7:47:33 GMT
Good video, but a couple of small points, "If it Matters", you asked for critique, and if its going to be critical...
"For us on here", amateur physicists but "Expert" sensible-ists, maybe this is a bit forward for our knowledge base?.
I understand speed of light from what Einstein stated, its relative to the viewers position in space and time.
I also understand it depends on the medium its passing through. From other sources, but all relative to Einstein.
I am presuming this to be an explanation of how Einstein got to those calculations....
So the video does explain that history to me, so yes, it makes sense.
But I did have to watch it twice.... dont know why but the first viewing it kind of stuttered?.. maybe my download speed was off at that point.
Can you give us an idea of at what stage of understanding you expect your target audience to be at?.
Minor point here, tapping the board with the pen tip... annoying?.. maybe everyone else here has different mileage, but I used to have a lecturer back in college who did that, and it annoyed the hell outa me, he did it VERY LOUDLY with a piece of chalk and it sort of stuck that he wasnt that good a teacher if he had to play a percussion track to back his words... again, is this just me?.
Whats that in English?... your using of meters?. ....
If your doing 65mph in America, hows that translate to Meters per second?.
You swap between the two.
And I always learned things in MPH, speed of sound of the top of my head is 767/770mph [*S] "Mach 1".
Ampere and Coulomb with the vacuum permeability, whassat got to do with speed of light, I dont think you explained that before you moved on.
Maybe OK if you are ahead of yourself there and as a viewer understand these things already, but first time viewers?.
You say that they come up later for Maxwell, but you dont say what they are in relative to light speed.
Maybe a little confusing?. [*1]
Maybe its worth mentioning that light *may* change speed through an atmosphere at this point?.[*2]
Is any of this helping?.. is there a specific point you think you didnt manage to get across that you need input on?.
[*S]At low height on a good day... they talk of an ideal gas in some places, but what that means is zero altitude on a warmish average day.
[*1]Speed of electricity in a vacuum... I didnt know "It matters", because electricity flows through a wire anyway, unless its between two charged particles in a cloud [lightning] and that aint a vacuum?.. how does electricity flow through a vacuum any different than in air?. is this a separate discussion?..
[*2]This I only just worked out myself in relative to my own age.
It was only when I was past 50 yrs old that I fully understood that light changes speed due to external influences, such as heavy gravitational fields atmosphere and temperature of atmosphere.
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Post by rmc on Jun 4, 2017 15:04:21 GMT
Great review, Silverdragon! Sorry it ended up taking two viewings!
Target audience? Maybe those who have taken high school introductory level physics and have heard of much of this, but are left with some feeling that they just don't see why Einstein decided to postulate the speed of light is constant for all observers. Perhaps I should state that in the beginning.
Agree that the tapping is uncalled for. It's some sort of instinct because I don't remember even doing it, but it's there! If I do that again next time will need to cut the sound there in editing.
Will need to link the constants of electromagnetism in a vacuum to Maxwell better than I did. Perhaps all those equations should share the board at the same time rather than on two different screens. Other than that, it goes back to this being just an overview and not a crash course.
And I wanted to keep in meters per second everywhere, but there is also a need to reach those who are, unfortunately, more comfortable with miles per hour. Not sure what to do here. If I sometimes mention miles per hour I upset certain folks.
I'll try and stress this is in regard to electromagnetism in a vacuum so as to minimally address the issue that light travels differently in other mediums.
Thanks again!!
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Post by silverdragon on Jun 5, 2017 9:11:38 GMT
Tapping, tape a piece of felt to the top of the pen?... just an idea....
Speed thing, can you try using both at the same time?.. thats 65mph or 104.60736kph, 767mph or 1234.366848kph or Mach 1,
Or, 299,792,458 Meters per Second = 670,616,629.384395 Miles per Hour. or "C"
Which is bloody fast.
[All figures approx due to me rounding them up from impossible pedantacisim to just enough to make them accurate.]
Some people may applaud the translation, you could explain what they used and why, I dont think it matters that much, its just "some of us" cant work in KPH.
I personally can only think in MPH, because I am "of that age" where my brain set as a youngster to Imperial.. I can think in Cm or MM, but "Only just", and that has been in the last 20 yrs, I used to think in Thou', thousandths of an inch...
If someone tried to ask me to drive in meters whilst I was driving, the mental maths of one meter is 3.3ft [approx] one yard and a tad, and one mile is 1.6 kilometres, I would be distracted. and therefore not driving?.
You could introduce the electromagnetism in different gasses as "We are taking our figures today as those produced by these people working in a vacuum of outer space, different gasses produce different results, but that is a separate discussion, and too long to include today"... and maybe do that discussion as a separate Vid "To complete the set"?..
I do hope I am helping.
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Post by rmc on Jun 5, 2017 9:26:08 GMT
Yes! Of course you're helping! I'm factoring in everything you say! And, thank you very much too, by the way!
I just hope my next attempt to video this will include every change that I want. I scripted the last attempt too, but completely failed to stay on course with what was written, because that's just what happens "live, on camera" for some of us. I rehearsed too, but when the camera is on, well what comes out the mouth is pretty hard to control, it seems. Or else it just sound like it's being read. I'll get it eventually. It seems like it's all part of some expanded form of rehearsal.
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Post by silverdragon on Jun 5, 2017 10:10:15 GMT
How about a few screen shots of pictures of the people you are talking about?..
That may give you the ideal opportunity to do shorter pieces to camera and a little light editing between to combine several shorter good takes together to create the finished piece?.
Question, do you have access to one large whiteboard to make a "Family tree" off all the influences of the final product of Enlistees theory of relativity?.. I am thinking it may be a good visual aid to infer that he didnt just have a flash of inspiration, but it took decades of work to get to that point, and indeed centuries of work of his predecessors?..
And also, if anyone else out there is reading this far, at least give us a sign that we are on the right course here?..
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Post by rmc on Jun 5, 2017 21:09:55 GMT
Basically, shortening the above to only an outline...
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Post by rmc on Jun 9, 2017 2:27:03 GMT
Basically, if I truly understood the topic, I'd be able to properly talk about it. There remains a couple of points that I am unclear on, however. I had hoped making a video would make obvious the parts that I don't quite have. Or, I could try and simply list them here instead? Anyway, no problem if this topic is uninteresting. I just thought I'd ask.
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Post by Lokifan on Jun 9, 2017 21:50:01 GMT
You cover a lot of information in a short time, and I confess, I found the real meat of the subject starting at about 10 minutes into the video. Those last five minutes were well stated, discussing the viewpoint of the two observers.
That's not to say what preceded it wasn't worthwhile; far from it. I confess I either didn't learn or didn't remember the steps in history getting to Einstein--I tend to think "Newton" then "Einstein" and skipping the others.
I see the problem you have, as well. So many steps to get from Galileo to Einstein, and if you had to go further into the subject, it would be much longer. After all, whole libraries full of books cover the works of these people.
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Post by silverdragon on Jun 10, 2017 9:41:10 GMT
You learn something new every day.
About 10 of those 15 mins were education to me in that they strung together all those predecessors of Einstein in a logical way that for me, showed me how he got to that part....
There is this common miss-belief that Einstein "was all that and a bag of chips"...
Well, yeah, he was, he had a unique way of making the bloody difficult somewhat easier to understand, and managed to put into words a few things that a lot of people never thought about before, but, a lot of his studies were indeed studies, and some he studied from other people.
Getting to realise that the great man was just one of a whole bunch of people working on the matter was informative.
Its not that as you think some of us are not interested...
We are.
Its just that what he was doing was maybe a little above our own pay grade?.
Think this way, if I were to explain the complex mathematics involved in the "Moments" force, angle and dynamics of backing up a 60ft trailer over-wide-over-weight through the gates of a factory with only 6 inch to spare each side, they would be beyond the abilities of many people, and to be quite honest, probably leave me scratching my head as well, I just get on with the job, but the actual explaining takes a special kind of person, we call them driving instructors...
What you have here in the theory of special relativity, is a subject that, maybe, many fear to tread?.
I know I have to think carefully before I speak on the subject, because a fool and his words are soon parted, I am only just able to understand some of it, from below the pay-grade of your students point of view.
I did not study this at any time...
We got this is Einstein and this is his theory remember it there may be a question.
It was only after the exams I learnt the definition of theory in the above...
It fascinates me, I can understand it, but its all self learnt, and I am a little scared of the subject in that it may be quite evident as soon as I start to type how little I know.?..
And yes, you requested feedback on the way you presented the narrative, which you did rather better than anything I could have done, so I hope I helped.
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Post by the light works on Jun 10, 2017 14:28:32 GMT
You learn something new every day. About 10 of those 15 mins were education to me in that they strung together all those predecessors of Einstein in a logical way that for me, showed me how he got to that part.... There is this common miss-belief that Einstein "was all that and a bag of chips"... Well, yeah, he was, he had a unique way of making the bloody difficult somewhat easier to understand, and managed to put into words a few things that a lot of people never thought about before, but, a lot of his studies were indeed studies, and some he studied from other people. Getting to realise that the great man was just one of a whole bunch of people working on the matter was informative. Its not that as you think some of us are not interested... We are. Its just that what he was doing was maybe a little above our own pay grade?. Think this way, if I were to explain the complex mathematics involved in the "Moments" force, angle and dynamics of backing up a 60ft trailer over-wide-over-weight through the gates of a factory with only 6 inch to spare each side, they would be beyond the abilities of many people, and to be quite honest, probably leave me scratching my head as well, I just get on with the job, but the actual explaining takes a special kind of person, we call them driving instructors... What you have here in the theory of special relativity, is a subject that, maybe, many fear to tread?. I know I have to think carefully before I speak on the subject, because a fool and his words are soon parted, I am only just able to understand some of it, from below the pay-grade of your students point of view. I did not study this at any time... We got this is Einstein and this is his theory remember it there may be a question. It was only after the exams I learnt the definition of theory in the above... It fascinates me, I can understand it, but its all self learnt, and I am a little scared of the subject in that it may be quite evident as soon as I start to type how little I know.?.. And yes, you requested feedback on the way you presented the narrative, which you did rather better than anything I could have done, so I hope I helped. Just keep the driver's side 6 inches from the doorjamb, and let the passenger side look after itself. |
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Post by silverdragon on Jun 11, 2017 7:19:45 GMT
You learn something new every day. Think this way, if I were to explain the complex mathematics involved in the "Moments" force, angle and dynamics of backing up a 60ft trailer over-wide-over-weight through the gates of a factory with only 6 inch to spare each side, they would be beyond the abilities of many people, and to be quite honest, probably leave me scratching my head as well, I just get on with the job, but the actual explaining takes a special kind of person, we call them driving instructors... What you have here in the theory of special relativity, is a subject that, maybe, many fear to tread?. Just keep the driver's side 6 inches from the doorjamb, and let the passenger side look after itself. Bit difficult when you have to do a 90degree turn from the road, one mirror is showing you the side of your wagon, the other is showing you all the places you passed on the way in, if its an offside reverse, you have all the cab in the way between you and the gate on one side and "Bugger all" thats of any use on the other, you have to use all sides of the road at the same time, and have "Walked the course" before you start to make a mental map of what you are about to try... And then you get some "Prize" who thinks he is helping by directing you from behind the trailer. "Blind spot" anyone?... If you cant see my mirrors, I cant see you?. If I get the drivers side 6 inch from the doorjamb, I am in. |
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Post by the light works on Jun 11, 2017 14:32:40 GMT
Just keep the driver's side 6 inches from the doorjamb, and let the passenger side look after itself. Bit difficult when you have to do a 90degree turn from the road, one mirror is showing you the side of your wagon, the other is showing you all the places you passed on the way in, if its an offside reverse, you have all the cab in the way between you and the gate on one side and "Bugger all" thats of any use on the other, you have to use all sides of the road at the same time, and have "Walked the course" before you start to make a mental map of what you are about to try... And then you get some "Prize" who thinks he is helping by directing you from behind the trailer. "Blind spot" anyone?... If you cant see my mirrors, I cant see you?. If I get the drivers side 6 inch from the doorjamb, I am in. we now have the ladder trucks fitted with wireless fire-com headsets. now the only challenge is getting drivers who know the difference between driver's side and passenger side. |
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Post by rmc on Aug 21, 2018 1:22:46 GMT
Thank you for looking at that 15 minute talking-head video (sorry for the length). I think I found the point that gets me into trouble in it finally. It's about nine minutes in. Rather than reshoot the whole thing, or otherwise attempt to pull it down, insert corrected footage and then publish again. I have, for now, opted to just include a link to me in another video admitting my error and trying to explain a correction (this one is less than four minutes):
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Post by the light works on Aug 21, 2018 14:27:24 GMT
Thank you for looking at that 15 minute talking-head video (sorry for the length). I think I found the point that gets me into trouble in it finally. It's about nine minutes in. Rather than reshoot the whole thing, or otherwise attempt to pull it down, insert corrected footage and then publish again. I have, for now, opted to just include a link to me in another video admitting my error and trying to explain a correction (this one is less than four minutes): "they csn fix that is post production." |
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