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Rabbit on Da Moon
Registrace 25. 04. 2008
Hello and welcome to this channel. This is where I post videos about physics, random DIY hobbies, and the occasional video game. So far, most of my videos are about trebuchets (or catapults), but I'll probably expand to something else.
Elo Hell: Testing Moba 5v5 Rating Systems. Do they work?
Despite the popularity of competitive MOBAs, there is very little publicly available information on 5v5 rating systems and how well they work. This has led to crazy claims about the existence of Elo hell, an inescapable pit of toxicity that you will never leave, and a surprisingly common belief that 5v5 ratings don’t work at all.
I try to address these concerns by implementing and benchmarking a 5v5 rating system. I find that 5v5 leagues can work, but they require considerably more games per player than 1v1 Leagues.
I try to address these concerns by implementing and benchmarking a 5v5 rating system. I find that 5v5 leagues can work, but they require considerably more games per player than 1v1 Leagues.
zhlédnutí: 48 857
Video
Superconductivity and The Meissner Effect Explained
zhlédnutí 105KPřed 9 lety
There are many superconductivity demos featuring levitation. Unfortunately, most are either not explained or wrongly explained as lenz's law. This video gives a 5 minute explanation of the Meissner Effect and Superconductivity, giving a summary of BCS theory. Hopefully, by watching this, you will understand the difference between superconductors and normal metals.
Trebuchet Sling Release Mechanism Guide
zhlédnutí 119KPřed 9 lety
This video gives an overview of two types of sling release mechanism. It first studies the standard angled pin release in detail, which is triggered by sling angle. It then shows how you can do an arm angle triggered release, as used in a multiple rotations trebuchet. Hopefully, this will give fellow trebuchet builders some ideas.
Archery: Heavy Arrows and Penetration Depth (Physics)
zhlédnutí 7KPřed 10 lety
This video provides a detailed explanation of penetration depth in both arrows and bullets. It shows how you can analyze high speed video to show that arrows and bullets are in the viscous drag regime. This means that penetration depth is determined by starting momentum for both arrows and bullets in ballistics gel. Hopefully, this will shed light on this question.
Trebuchet Physics Tutorial: Make Your Trebuchet Throw Farther
zhlédnutí 324KPřed 10 lety
This is a brief tutorial on trebuchet physics and useful tricks to make your trebuchet throw farther. Much of this isn't obvious if you're new to trebuchets and I overlooked many of the key energy transfer methods when I was starting out. Hopefully, this will help you optimize your trebuchet In this tutorial, I discuss how to use sling stalls and CW-arm stalls to your advantage. Having a basic ...
Quantum Levitation or Vortex Pinning Explained
zhlédnutí 13KPřed 10 lety
In this video, I explain the effects vortex pinning of vortex pinning on levitating superconductors. Since it involves vortices with one quantum of flux, the effects I am explaining are also known as quantum levitation or quantum locking, because that sounds cooler. However, since it's just another vortex pinning effect, I'll refer to it as such. I'll start out by explaining the Meissner effect...
How to Make a Pencil Trebuchet. (Tutorial, DIY)
zhlédnutí 64KPřed 10 lety
In this video, I use pencils, floss, paper clips, and scotch tape to construct a table top trebuchet. Hopefully, this will show you how to use square and diagonal lashings to tie the pencils together to make a frame as well as give you guidelines for tuning. However, if you want additional information about tuning, see my trebuchet physics video. If this video gets enough views or if I get trap...
Trebuchet Design Physics Tutorial (With Tuning Guidelines)
zhlédnutí 16KPřed 10 lety
This is a brief tutorial on trebuchet physics and useful tricks to make your trebuchet throw farther. Much of this isn't obvious if you're new to trebuchets and I overlooked many of the key energy transfer methods when I was starting out. Hopefully, this will help you optimize your trebuchet In this tutorial, I discuss how to use sling stalls and CW-arm stalls to your advantage. Having a basic ...
SEC Dual Conference Cheat: How the SEC has 6 of the top 10 teams in BCS Rankings
zhlédnutí 575Před 11 lety
In less than 2 minutes, I show how you can sketch an easy diagram and obtain a deeper understanding of the structure of any two division D1 conference. I then compare the structure of the 2012 SEC that of the PAC 12. This is a critique of the SEC's unique 14 team conference system, where 8 games played in conference and 4 played out of conference (8-4). Due to a 7 school division size, the SEC ...
Multiple Rotations Trebuchet
zhlédnutí 13KPřed 14 lety
Growing up in Ohio, I came across this device in inter-school trebuchet competitions. It had performance comparable to a floating arm trebuchet. This is my assessment of the device. The video clips I am using were used by the creators of the device to plot the motion of the arm, projectile, and counterweight. It was not initially shot for instructional purposes. The simulation, however, is my o...
Thank you, very cool
Now i am even more confused than before. There is nothing in this vid abt practical application or testing and adjusting release points. Video for egg-heads only not for a normal dude just tryna learn how to build and tune a tribuchet in his back yard.
@rabbit on da moon why did you stop making videos? will you ever start again?
JUST BRILLIANT ♥♥🏆🏆
1 2 buckel my shoe
Your losing me...
This is boring as fuck...you might have some good Information...but I've committed loss of interest...use a working model...drawings are rubbish and Not that good to interperate to working
friend if this quantum lock be invention? (false). The nitrogen freezed Aether nearest magnetic poles inside material...think in this (the material now is magnetic ) AETHER CAN BE PROVED (true). {isso explica porque o imã pode girar em seu eixo magnético...em supercondutividade isso não deveria ocorrer [variação do campo magnético geraria Ed corrent (fomos enganados?)] }. Congratulaitions! like you!
wow so cool ! quick question do you prefer cats or dogs! :D
I love the drawings, and strangely the drawings make it easier to understand
Now, put the trebuchet back on it's wheels like it's supposed to be and explain why it works a LOT better.
A floating arm trebuchet (FAT) doesnt need wheels, the F2K is hard to beat.
Happy vibes! Happy Summer Solstice 📧🎈
Easy nerd, I just need the dimensions
What
Hey very cool!! I just now discovered this happened, 3 years before I built my rotary trebuchet czcams.com/video/_AEBPqOlhxA/video.html I was also fascinated with the energy transfer between weight, rotator, sling, and projectile. In my machine the rotator significantly slowed upon unwind and release, indicating energy transfer. It also kept going a bit and often got tangled.
Hey, i need some help understanding the ecuation at 1:36, can anyone help me with it? I read it as: θ=a*tan(1/μ) but have no idea what that (a) means.
NO THEY DON T !!! ELO IS MADE FOR 1V1 LIKE CHESS NOT FREAKING 5V5 GAMES
So, what is the explanation? All I saw was that classical EM cannot explain the effect and it needs a QM approach, but there was no explanation provided, just the usual fluff about BCS theory, accompanied by music.
This all just sounds like a bit from interdemensional cable
Great content, but man, that narration killed everything. Just fast reading material in the most boring way :<
Had to watch this with no sound and captions only. Why don't people understand that educational videos shouldn't have background noise? Is it really that difficult to understand?
I was laying in bed, thinking about trebuchets. Wondering how you “press the trigger”. My search led me here. You answered my question. You also reminded me why I love physics. Thank you for the video.
Despite being unashamedly scruffy, this presentation is helpful to understanding the phenomenon.
Bro bro.. bro, the background music is extremely distracting.
So this mean lol ranking system actualy not accurately measure ur skill?
VERY hard to hear what you're saying with the music.
This a great video but I thought a lightsaber battle was happening bc of the music
Since many electron pairs can be in the lowest energy state at the same time, the energy in all the electrons is lower than required to interact with the positive ions therefore, no collisions take place with the positive ions and no energy is lost as heat. The result is zero resistance. This is to the best of my understanding. Can somebody correct me?
How many times you try to make good trebuchet ?
The explanation starts here @ 3:44
Thank you
How far can this shoot a bean bag (need one to go 25 feet using a bean bag for a science project).
This helped a ton with my science project. AWESOME!!!!!!
wow, this is incredibly helpful! It definitely helped me with a physics project of mine. I learned a lot, thanks!
Great physics and video. Narration, not so much. Please speak more loudly. And thanks!
So you explained how electrons act as composite bosons, but how does that lead to the meissner effect. What about a BEC leads to the surface currents which expel external magnetic fields
I think pedagogically you could do this even better. Music off, of course. But when approaching a phenomenon, one should observe the phenomenon only, not the interpretation. Therefore, switch off the magnetic field lines when demonstrating, we want to see only what happens, not your personal interpretation. It is like you give the impression that the field lines are observable. To avoid, you may show the phenomenon in reality instead of on pictures. Now, a question: Is it not true that the only explanation for Meissner effect is what is contained in London equations? To me, the London equations are just descriptions. Therefore, I claim there is no explanation of Meissner effect. Do you agree?
One factor in performance of these trebuchets that seems entirely overlooked in modern reconstructions is that the Medieval builders appear to have made the throwing arm flexible rather than stiff [as modern makers typically do!]. In medieval images, the throwing arm is generally a group of smaller-diameter shafts bound together. I tried this and found it worked like one arm of a bow, i.e., bending first as the counter weight descended and, as the shaft moved upward, slowly accelerating the sling & projectile, and reached full height, the compressed throwing arms increasingly accelerated the projectile like a spring. The projectile left the sling faster & went farther than a stiff throwing arm allows. Think like a Medieval engineer based on what they knew.
This is a nice video with plenty of mathematics to explain the results. But there's one issue: you're assuming everyone uses the ELO rating the same. They do not. This is evident in smite. People noticed playing ranked (where you can actually see each player's ratings) that the system regularly put people at the lowest ranks against opponents with the highest rank. Worse yet, the rank of the players within each time varied widely. You could see games where one gold player would be thrown into a match with 4 bronze allies, and all gold and silver opponents. Its clear that the system wasn't matching players up based on skill. And you know what? Hi-rez confessed to this. Their system does NOT pair you up with allies and opponents of the same rank as you. In reality, the system is designed to keep your winrate at 50%. If you go above that, the system will pair you up with increasingly bad allies and give you opponents that are increasingly higher rank than you. However, you to start to fall below 50%, then the system gives you allies that are higher rank than you, and opponents that are below you. They claim to did this to boost player confidence, because it ensures that everyone has a winrate of 50% regardless of their actual skill. And they reported that the system was working EXACTLY as they intended; everyone's winrate hovered around 50%, with even the best players not managing to get above 55%. This kind of system creates a whole host of problems that you could write an essay about. 1. Games are ALWAYS one-sided. Playing smite for years, I only ever got TWO games that were actually a fair fight (and I remember them because they were so fair, which was unusual for the game). Every game is made to be one-sided to keep everyone's win rates at 50% 2. Keeping everyone's winrate at 50% makes everyone believe they know exactly what they're doing, regardless of whether they do or not. This results in a culture of arrogance, where everyone believes they're a pro, and because the system often pairs you with allies that are below you in ranking, it IS 100% true that if you lose a match, chances are it wasn't directly your fault, but who were you paired with. 3. Since everyone thinks they know what they're doing, the overall skill level is low. This can really be seen in the different versions of Smite. PC players were clearly better than ps4 players (on average, anyway). However, even on ps4 everyone was convinced that they knew what they were doing because their winrate was 50%, and even if they moved over to pc and got owned hard game after game, their winrate would still be 50%. 4. The 'rewards' are completely backwards. The game literally punishes you if you win, and rewards you if you lose. I actually started intentionally feeding for a while in smite. And you know what? My winrate didn't go down one bit! In fact, I had far more pleasant games when I deliberately tried to sabotage the game than I did when I actually made an effort. I didn't know this at the time, but what was happening was that the system was putting me in teams that could win despite my behavior because I was doing so poorly. So yeah, I got rewarded for intentionally feeding, and punished for actually trying. Wtf? 5. Rigged games. Who enjoys that? Your own skill in such a system literally means NOTHING, because every game you play is rigged to either make you win or lose, depending on what would keep your winrate at 50%. All these reasons (and the fact that the game is COMPLETELY un-moderated, and admittedly so, oh and the game seemed to have NO concept of balance, because the developers claim that even they couldn't play their own game, seriously) is why I left. More recently though, I've heard that dota 2 literally does the exact same thing! If this is true, then how common is it? I always thought it was unique to Smite and its obviously inept development team, but if dota 2 does it also, who knows who else? I don't know if LoL does this (haven't played it in years), but I don't recall the matchmaking system feeling like I was always playing one-sided games. Then again, I did seem to alternate back and forth between winning and losing streaks for some reason; I would literally win 4-5 games in a row, then lose 4-5 games in a row back and forth. How common is this? And we clearly shouldn't be trusting corporations, that are just trying to milk people out of as much money as possible, to make games that are enjoyable and fair. We don't know what's going on behind the scenes, we don't know how the matchmaking or how some aspects of the game actually work. As for dota, there is evidence to back this up. The top players of dota 1 can never get a winrate of over 55% in dota 2, no matter what. It does seem like the system is pairing them up with bad allies to try and keep their winrate down. Even miracle and other top dota 2 players have released videos where they're carrying teams that are clearly far worse than they are. So it IS perfectly possible that this IS the case in dota 2. You don't see this one-sided nonsense in dota 1, though in dota 1, new players are virtually non-existent. As a consequence, the entire player base is made up of people who have been playing a long long time, thus there isn't much variation in skill level. Long story short: just because a game has a ranking system, doesn't mean that its fair. They may not be matching you up in the way that you think they are.
Good stuff and well presented! All the fine folks with “suggestions” in the comments are free to make their own, better, video (not).
Great video! I use it with my physics classes. Videos are hard to follow, very grainy. It would be great if you would redo it using most recent generation iPhone or Samsung S10 or S10+ with super slo-mo.
This video is almost 10 years old, congratulations
Hello everyone that is building a trebuchet for their project, I am too. Good luck!
My trebuchet is 4ft tall
Bad handwriting and me too
Clove hitch? Lashings? It is an honor to be here my fellow scout.
Rabbit on Da Moon - Do you ever teach in a class room? If you do, do you switch on a music player before you start talking? Like you, I like Beethoven, but honestly, I would have taken in a lot more of the subject without the distraction of the music.
Here is some advice on operating a small youtube channel. 1) Find a subreddit that moderately interests you. 2) target your content to that subreddit. 3) Post your content to that subreddit in a respectable and not greedy way. This will get you a thousand or so views. If you are lucky/good, it will get you 50,000 views on the first day. If your title is sensible and they liked the video, you will get maybe a steady stream of 20-100 views a day from youtube. Eventually, your channel will reach a size that people won't realize that you aren't a professional youtuber, but will start to demand professional production quality. At that point, you will have more sympathy for me.
Rabbit on Da Moon - I really don't know why you have given me a lecture on how to make 'successful' CZcams videos. I have made several CZcams clips, but frankly, I'm not interested in how many people view them, as I have never registered to monetise my clips in any way. Success is not what I'm looking for - what I want is simply to pass on hard-won knowledge to make things simpler for other people who tread the same path, and as the aim is to pass on _knowledge_ , I don't put any music track on them, because I know how distracting it is. Why do you make videos? As the title says this one is about Superconductivity and The Meissner Effect, I can only suppose that your interest is didactic rather than financial. It's not a subject that is likely ever to go viral. If teaching is your aim, then my question about putting music on before you start teaching is a valid one. I know this is a modern idea, and my daughter was told at school that she should put a music track on while she was studying, because it would insulate her from the outside world. I have always found absolute silence to be best, so I was strongly doubtful that music would help, and suggested that she should do a test - with and without music, and try to evaluate which environment was better for learning. She told me a couple of days later that she had put it to the test and decided that she definitely retained a lot more (twice as much, she said) if she studied in silence. Superconductivity is something that interests me, hence the reason for me seeking out this video, but though I listened to it twice, I didn't really take in a great deal because I was distracted by the music. If your object is popularity and monetisation, then I guess you have to produce videos "for the masses", but if your aims are didactic, I really believe your videos would _teach_ more effectively without the music. There are moments, like around 0:30 when your voice is almost drowned out. It's not just me - look at your other comments - "The music is a bit distracting", "music is too loud", "really hard to hear your voice when the music is blaring" I appreciate that you're trying to get your videos "out there", but let's be honest, like my video course on assembler programming, videos on deep science, methematics, etc. will never have a wide popularity. Finally, it's your video, so it's your choice. I made that comment constructively. I'm not attacking you. I really appreciate people who give of their time and expertise - and this is just my opinion, but I think you could make them more interesting, and the information that you impart, more memorable and impactful by bringing your voice to the fore.
After thinking about what you said (past the first paragraph), I have to say that it is very easy to assume the worst intentions in a comment and I might have judged you a little more harshly than I should have. At some level I made these videos, primarily because I wanted to get some information out and because I was interested in exploring the possibilities. Monetization was mostly due to the assumption that youtube algorithms would favor monetized content, which after the post Logan Paul mass demonitization seem like it was true (then again, view count is strangely seasonal so I won't know for a year). High production, especially audio (which I really hate doing) was never a priority. I cut down on making them mostly because the price of my time suddenly went through the roof. Best wishes.
Rabbit on Da Moon - Thanks for reviewing our conversation, and for the reconciliation. Music is fine, and even desirable if it appeals to the audience you are targeting - but the lecture is what's most important. Even Beethoven should be kept in the background! Best wishes to you too. I'm subscribing in case you do future science videos.
Could you plz tell me the formula for superconductor to produce flux ???? And another question Is superconductor and electromagnet get replel ??????????
You better not have any problems in your life... You smart. Great Video!
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