Hearted Youtube comments on Veritasium (@veritasium) channel.
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Fantastic revisit! The animations and the simulations were spot-on, and great at showing the difference between the transient “first-second” effect, and the steady-state “rest of time” behavior. The whole “expanding loop of current” thing is a great way to phrase it, because after that poynting loop expands to match the actual physical loop of wire, then stuff starts to behave normally and all of the power is transmitted around the loop very close to the wire.
I still hold that for this simple circuit, turning on a lightbulb with wires much smaller around than they are long, the effect of surface charge vs internal charge is negligible, so you can ignore any skin-effect stuff and say that “mobile” electrons are indeed pushing on other “mobile” electrons using their fields, but I totally agree that that’s a simplification, just a simplification that makes the intuition a lot easier.
I also need to do some math about how far the average “electron” is displaced in order to build the initial charge distribution around some typical circuit elements - axial flow is the only way I understand those charge distributions getting built, and this whole endeavor has made me think hard about what that means. Someday when I think I understand it better I’ll edit up my pt.2 response video - thanks for the shoutout! I’ve got a great experiment in the works to show the “expanding poynting loop” 😁
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First and foremost, this is a awesome video. But if you sunk to the size of a nickel, considering that all your other organs shrink with the body, around a ratio of 1 to 85, your blood vessels which is currently around 4mm wide would shrink to 5 to 10 micrometers, with your capillaries shrinking to around 0.06 to 0.12 micrometer. You might be thinking now that red blood cells would shrink too, but red blood cells are made of molecules with a fixed atomic bond size, this means the red bloodcells can you shrink to a certain limit(70% of current, 5 micrometers) before rendered useless. Thus your red blood cells would be hundreds of times bigger then your capillaries. Just a side note, Van der waals does play a role here, as 0.06 to 0.12 is close the scale(not at it, just close) of where van der waals forces start dominating, making your blood vessels very very fragile. With this in mind, you would almost immediately die of blood blockages. Also, your DNA molecules don’t shrink, because atoms remain the same size. Normally, the double-helix of DNA is ~2 nanometers thick, which is fine for normal cells but becomes massively oversized if your cells shrink. Your cell nuclei would be too small to fit your DNA, meaning your cells wouldn’t divide or function properly. A lot of organelles like the mitochondria will also not be able to shrink aas they are already almost at the physical limit. Neurotransmitters, ion channels, and synaptic gaps are already nanometer-sized, meaning your brain’s electrical signaling would break down completely if everything was compressed. Air and water molecules will also be too big for your body to absorb properly, same would happen with food molecules like protein. P.SSo in this senerio of you being nickel sized, You would instantly lose all consciousness, almost instantly get blood blockages all over your body, your cells will collapse(DNA, mitochondria), you will also suffocate and starve. Lets say by some miracle, you survive and try to jump out(which theorietically is totally possible as you can jump up to 3.5 kilometres), you going to to shoot upwards(if your jumping using the energy your normally would) you would move up at 940 km/h, which would rip your body apart(85G of force), and deafen(maybe kill) you with sound caused by breaking the sound barrier. Oh, you would also bonk your head on the ceiling! Now you might say you’d jump up exactly the right distance, but you would have to control your energy output to around 175 microjoulesm which is more energy then that produced by a grain of sugar falling 1cm. In comparison taking one single step in your normal size takes 390000 times more energy then jumping out of the blender, making it imossible to control you energy output. Just one final peck at the teaser, if you were in that situation and moved even a tiny bit like walking you would explode into the air. In conclusion yet again, as a nickel sized human, your more cooked then my chances of getting a gf.:face-fuchsia-wide-eyes:
P.S. Pin me for a cookie
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Taking responsibility is a risk-taking behaviour. I remember when on a summer job at a power supply manufacturer, I found out an issue with the product that had to be corrected - when boxes were already about to be loaded into the shipping truck. So I said wait, we have to fix this. Later that day, my boss said, it's great that you stopped the shipment, it was a responsible decision. But you should have gone straight to my office, because you did not have the right to stop the shipment. And he was right - I had no such right. I just had the responsibility to pretend I did, because the alternative would be a recall.
Some people are primarily mission-oriented: they want to accomplish the end-goal. Others are more process-oriented, they are motivated to follow the procedures. Aviation is an interesting combination of the two, because following procedures is critical to safety. That means it is very risky to start improvising, and there is a strong requirement to avoid doing it.
There were two key elements that were missing in Earhart's flight: understanding of radio propagation on her part, and a strict, mutually-agreed to, detailed communication plan. Given that there was no possibility to divert, disaster was a distinct possibility. And yet, everyone seemed to have thought "we'll make it - somehow."
Of course, hindsight is 20-20.
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I grew up in Khartoum, Sudan, I graduated in a degree in Medicine and Surgery last year, although I love medicine, but surprisingly I love art too, and I wanted to be a photographer/filmmaker, so guess what? I started to be make videos about interesting topics in medicine and science on YouTube (in Arabic language with English subtitles for now), and I'm kinda loving it, having a job as a doctor definitely makes it harder to make videos, but I will never stop.
Watching a story of a ''survival'' is always inspiring! Keep up doing what you love Derek! Thanks for sharing your journey with us! It’s so relatable, I love you! ❤
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As a blind person with tinnitus, I gotta say that it totally breaks some of the really neat stuff I used to be able !.
I used to spar with friends with swords and staves, but now I basically don't, because I have a constant ringing in the sound spectrum I used for echolocation, which is probably dependent on my ear shape.
It's really quite problematic for me. I used to go without my cane through public familiar spaces, like my school, and I avoided people naturally and easily.
Now, even with my cane, I sometimes run into people like a cartoon blind person, simply because the sounds, which used to be audible to me, of the environment echoing off people's skeleton and other dense parts is pretty much exactly where I have the ringing.
I would do just about anything to lose this horrible disability. Tinnitus is the worst!
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I want to say this:
I’m currently an electrical engineering major at Texas state university, and he had posted the video this one is responding too I had no clue what was really happening. It was very vague and confusing for me, and I didn’t know what was going on. I was on my way to take a Circuits analysis course and a Physics Electricity and Magnetism course, and I was a little worried that I wasn’t going to get it. One semester later, he posts this video, I have an A in both classes, and every concept he covered in this video I learned in class. This video was great, and I appreciate your review over your old video, and this one on circuits, Electricity, and Magnetism is one of your best educational videos
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Okay, I've watched it once. Only four more watches, after taking some notes, reading those, and then perhaps watching one or two more times, maybe I'll have a question.
That said... I feel like I am on to what you are saying.
Or a question, now, while it's hot on my mind. When I'm standing, and my muscles are pushing against the Earth to keep me up, am I accelerating against time which moves ever onward?
I think my question may be more refined, mature, after some further reflection, but if the aforementioned is worth answering, or commenting upon, please do.
Great video!
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I've questions :
a) Imagine that unbeknownst to you, one of the lines has been severed halfway to the moon - will the lightbulb still light up the same way, nanoseconds after you turn the switch?
b) If the answer is yes, why bother buying all that cable, wouldn't it suffice to have some kilometres of cable going left and right from the battery & switch, and from the lightbulb, without connecting one system to the other? Or maybe just some meters? Or some centimetres?
c) If the answer is no: Imagine some mischievous green three-legged alien cuts one of the two power lines halfway to the moon, one nanosecond before you turn on the switch. Would the lightbulb still light up? We would at this very moment be in situation a), and according to the assumed no-answer to a), the light would stay dark. But that would mean that severing the cable has an instant effect half a light-second away! In other words, the information "the cable has been severed" will have travelled faster than light!
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The biggest error is making it a game with rewards and penalties. A competition. When everyone says, "Let's not play games, but cooperate", everyone wins all the time. There are errors when people make mistakes. But, as cooperation affects education, business, jobs, food, care, systems, natural disasters, planning, making things that work - are sustainable - everyone wins. With success comes population. So you go to space - cooperatively. Maybe Star Trek got it right that war was a thing of the past and everyone cooperating was not a zero sum game. Hundreds and thousands of years of cooperation changes the world, and opportunities, in fundamental new ways. So, yes, stop calling it game theory. Not games, not theories. But practical solutions. A smart one invented a tick scratcher and everyone won - because that one did it for the benefit of all.
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Up to another 10 years Derek, I'd love to see you grow with us. ♥ In the past ten, I finished school, got my degree, got a job, started working out more, got amazing friends, and gained more confidence and self-appreciation than I could ever imagine. In the next ten I'll just, keep on going, get my driver's license, maybe move out and get an apartment, but mostly I'll keep on finding ways to cheer people up and make them appreciate life. Just like you, only I don't have an amazing YouTube channel. Keep it up, be safe, be happy
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