Military didn't want to build my death ray so I become architect

@TerryMcGinnis

4 жыл бұрын

Legit that sounds like an anime title.

@danilov114

4 жыл бұрын

Death Star would make a good space hotel... No for real! Lets build it... That laser is for light effects only...

@johndoe45678

4 жыл бұрын

Tesla? Is that you?

"The problem was the sun" My reaction: "oh"

@KaiHenningsen

4 жыл бұрын

Yeah. Most of our energy sources are powered by that uncontrolled fusion reaction - not only solar but wind and even coal and oil. And then there's radioactive material for our nuclear reactors and for much of geothermal, which gets its power from material resulting from supernova explosions before the earth was formed - other uncontrolled fusion reactions. Only when we build our own fusion reactors running on hydrogen will we truly be making our one energy.

@mrflip-flop3198

3 жыл бұрын

Ya don't say

@aidanwoodward3975

3 жыл бұрын

@@mrflip-flop3198 Me who read those 2 replys knowing I'm a mix between smart and meme in the future in a flame war: well actually...

"show up where you least expect"? Well, one place I expect physics to show up is in a physics simulation.

Joke's on you, I expect math and physics everywhere.

@stenarsk6877

3 жыл бұрын

Ikr. Those things govern pretty much everything

5:47 - The worst part is that the Vdara in Vegas and the "walkie-talkie" in London were both made by the same architect, Rafael Viñoly. He clearly didn't learn from the Vdara in 2010 when he made the walkie-talkie in 2013. 🤦 ¬_¬

@vihashah5975

4 жыл бұрын

- lolll😅😂

@Salien1999

4 жыл бұрын

The dude just loves parabolas, I guess.

@diegosanchez894

3 жыл бұрын

His hext creation: a stadium with a massive glass ceiling in the shape of a converging lens

@tomepsilon

3 жыл бұрын

Fun fact: Viñoly learned, and build a solar plant with the same mechanic.

@OrangeC7

3 жыл бұрын

No no, he learned exactly what he needed to. He's just slowly taking over the world, one scorched lemon at a time...

4:40 "They found that the problem was the Sun over the desert in the summer" That hot take is glowing in monochrome yellow-orange

“Any parabola”?!?!?!? There’s only one true parabola! - Matt Parker

Hi Zach, love your videos. Most math and Physics students are told of the famous Tacoma Narrows Bridge as an example when being taught about resonance, but in Engineering it is revealed the true nature of the failure was aero-elestic flutter and positive feedback.

2:26: “17 people” ah, the good ol’ days pre-coronavirus when we could gather in groups larger than 5

I've heard there were a building that was directing wind in the way that women's skirts were up and it motivateda lot of men to "walk around". That's some next lvl physics

@anthonytonev1357

4 жыл бұрын

This is what happens when you have men designing both the buildings and the skirts. It's intentional.

@KanoBoom

4 жыл бұрын

Anthony Tonev I thought he was joking

@HighestRank

4 жыл бұрын

Kano Boom and now what do you think?

@KanoBoom

4 жыл бұрын

@@HighestRank Its kinda bad but interesting

@ferry6700

4 жыл бұрын

Hmm interesting,, I mean the physic

Friend: Hey, did you see Zach Star's new video? Me: No... what's it about? Friend: I don't know, just some random physics and maths stuff about animations, parabolas and burning lemons... Are you gonna check it out? Me: Hell Yeah!

When this guy said random and then instantly moved from Pixar movies to 17 middle aged people + Tae Bo to the song I got the power

3:33 Ain't this how you speed up on a swing?

@dozog

4 жыл бұрын

'tis

@Diaming787

4 жыл бұрын

Yes, exactly. You extend and retract your legs at the resonant frequency of the swings.

@arciviousx2362

4 жыл бұрын

The logic is coming to me I can feel the power

@mskiptr

3 жыл бұрын

Also Cut The Rope - box 2

when life gives you lemons, burn them with architectural death rays

@psibarpsi

4 жыл бұрын

I dunno why your comment doesn't have more likes.

@williamstechnique5646

4 жыл бұрын

@@psibarpsi lol thanks feels good man

As if you can't appreciate Physics more as it is! Really awesome indeed man, now I am definitely more interesting in this kind of topic!

Quick bit: The Tacoma Narrows bridge wasn't resonance but self-oscillation. The wind didn't come in at a particular frequency. It is more comparable to blowing over the top of a bottle. It doesn't need to come in at a specific frequency, the oscillation is self-generated.

I appreciate your videos a lot. Whenever i feel unmotivated in my math/physics class, I watch a video of yours and I suddenly feel way more interested. It’s something motivating about hearing someone talk about the subject and not just learning it ik school. Whenever I think of subjects in school, I already feel bored because it just feels like a task to learn all the stuff.

Did you just read Matt Parker's book Humble Pi? A lot of these examples are also in that book.

Learning about resonance was one of my favourite parts of the physics course I did at A level. I think the coolest examples are the millennium bridge in London swaying just because the footsteps of commuters happened to be at that frequency. Or when the Tacoma narrows bridge in Washington collapsed in 1940 due to strong winds. Its an incredible video if you wanna watch it Edit: I wrote this before I got to the bit where you talked about the millennium bridge 😁 Another edit: well I feel like a fool now 😂😂😭

Bezier curve & winding number is also pretty cool. It makes you realize how much math goes into rendering just 2D curved drawings.

You're actually making me enjoy math. School ruined it for me but you revived it!

Also reflective telescopes usually use a parabola on the primary mirror.

Your profile picture! A couple years ago I found a picture of that impossible star on Pinterest & then redrew it only using a compass and a straightedge. Turned out fire. Anyways, thanks for making this video!

I did my structural engineering master’s thesis on the effects of vibration in buildings. I found something I think is not yet published: vibrations that bother people are the ones that resonate at 5 to 8 hertz. This is the same frequency as human organs.

@vishwajeetpandey7392

4 жыл бұрын

Did you published then?

@chinmaymathur7000

4 жыл бұрын

Publish it before someone takes the idea

@vsm1456

4 жыл бұрын

how do you measure frequency of an organ?

I dont know what is happening but this video popped up when i was just starting to learn animation from after effects.

@user-nu2pj2ch7t

4 жыл бұрын

Diwakar Koirala the algorithm hard at work

Thanks Zach 💯

About the Tacoma bridge. The wind was constant, it didn't match the frequency of the bridge, instead it was caused by aerolastic flutter, which is still a kind of resonance. Maybe you could talk about in another video?

Resonance is also behind Cut the Rope's second box.

More math fun: the differential equation of flexure i.e d2y/dx2 = M/EI. Cornerstone of engineering beam theory. Incredibly useful and important, and yes, it's fun too!

Some engineers place something that acts as a chaotic pendulum in buildings to prevent the building to ever come across it's resonance frequency, because doubled pendulum doesn't have one, along with every system that is being coupled to the doubled pendulum, therefor the building can never collapse because of edgy incidents like jumping together in one frequency or in an earthquake.

You are a legend mate, love you❤️

I love watching these while still in school, it never fails to make me want to learn more!

I love u Zach you make me remember that learning is lifelong

If I remember correctly the Tacoma Narrows bridge is a (common) incorrect example because it happened due to flutter, not resonance

This helps me concentrate and learn more about physics, which I don't know too much about yet. Thanks!

Amazing video, I'll send it to some of my students. Thanks!

The video is cool and I really enjoyed it,its so inspirational.

Zach: *uploads a video* Me: "ah shit, here we go again"

“If you want to find the secrets of the universe think in terms of energy, frequency, and vibration.” - Nikolai Tesla

hey ! please more often, your videos are really interesting.

thank youu

U always bring something new and cool ,Thanks Creator.

I loved this video!

This is ur 200th video and this brings u 500k subs Congrats

Wow, amazing video!

Amazing video! Could you make a full video about resonance? Tks

Things like these(1st part of the video referring to Brave) makes me believe the theory about us living in a simulation. Now it doesn't seem like a fetch theory anymore.

Really interesting vid. Maybe make it a series?

Lmao imagine my suprise (unsurprised) when they modeled it as a spring. I THINK ITS THE ONLY THING PHYSICISTS ACTUALLY UNDERSTAND

@tetraedri_1834

4 жыл бұрын

When I was undergrad, the head of physics department in our university said to us that it could very well be renamed the department of harmonic oscillators. As everything either is one, or is modelled as one.

Zach u r a legend in presenting amazing real life incidents that are related to maths and physics

Zach is a smart guy. All I know. Your content is unique .

Stable video👍

Tacoma narrows bridge collapsed not because of resonance ( a widespread misconception ) but due to something called "Aerodynamic flutter".

@gary3ward

4 жыл бұрын

Glad you pointed this out. He says a lot of things that are not accurate, but this is basically a bad advertisement for Curiousity Stream.

@olbluelips

4 жыл бұрын

Is aerodynamic flutter also a type of resonance distinct from the simple resonance within bodies?

@gary3ward

4 жыл бұрын

It is a bad combination of lift, inertia and resonance. Maximum lift occurs at about 0.2- 0.25 the distance from the leading edge of an airfoil, so has torsion component. So the airflow produces lift on a surface that causes it to twist. Inertia carries it past the point where where the springiness of the surface can overcome the twisting force and the force itself will drop if the airfoil twists far enough to stall (airflow detaches). The foil twists back in the other direction where lift is generated on the other surface causing it to twist in the other direction. Movement will tend to die out unless it is exciting resonance in the foil body.

@vsm1456

4 жыл бұрын

@@gary3ward so it's still resonance, isn't it?

@gary3ward

4 жыл бұрын

@@vsm1456 definitely resonance. I was just pointing out the aerodynamic effect that will match any resonant frequency. I should change the last sentence to read,"If the part is stiff enough it can damp out the vibration or else catastrophic failure can take place in milliseconds for smaller things like wings, ailerons, rudders and elevators. The aerodynamic forces will match the natural resonant frequency of any part if the displacement is great enough to cause stalling (detached airflow)"

Math and Physics are accurate ways to describe the reality. The problem is, the reality is really complicated.

Zach , there is this problem we had in physics class about three objects on the vertices of an equilateral triangle such that A moves toward B , B to C and C to A , when and where will they meet. Almost everything just says by symmetry ,the centroid is the neetig point , but the diagram itself looks beautiful ,I am trying to find if there more of a other method

Hey Zach nice video, what’s you’re opinion on biomedical engineering I’m kinda torn between that and mechanical I know mechanical has way opportunities.

Now this... this is epic

My physics teacher came upon the subject resonance and he too gave the example of the Tacoma Bridge, saying it collapsed because of the wind matching the bridges natural frequency. But when I checked in Wikipedia it said that it did not collapse from resonance but do to aerolastic flutter. I'm still confused on what's the real reason of the collapse.

Nice!

4:29 Now that's what I call a hot take.

Hi Zach. I wish to start a software startup. What degree would be helpful for this. Thanks.

The Tacoma Narrows Bridge actually did not collapse due to resonance; the real cause was aeroelastic flutter. When a breeze blew past the bridge, there was an uneven aerodynamic force distribution, which caused it to twist slightly. This twist imposed a more uneven force and moment in the opposite direction, which led to an even larger twist in the opposite direction. This process continued, where uneven aerodynamic forces resulted in an ever-increasing twist oscillation and ever-increasing net forces, until finally the critical strength in the bridge was reached and it collapsed. This is essentially what flutter is: just like resonance, it's an amplified oscillation, except instead of matching the natural vibrational frequencies of the structure, it's caused by lift, drag, and pitching moment feedback compounding on itself

2:31 You get a chapter in Matt Parker's book Humble Pi

Love you💕

We would love to see you starting a course on discrete mathematics for us.

@zachstar

4 жыл бұрын

I've been wanting to do some more discrete math, hopefully will have some videos soon!

I don't care if you re-upload, I will still be first

@spicy9116

4 жыл бұрын

Andrew Salinas what

@dangerfar

4 жыл бұрын

Andrew Salinas 4 days ago? This video was posted a minute ago wtf

@Eternap

4 жыл бұрын

@@dangerfar patreon early access prob

@Leyrann

4 жыл бұрын

@@dangerfar Why is there ALWAYS someone who doesn't know videos can be made available earlier to Patreons?

@dangerfar

4 жыл бұрын

Leyrann Maybe because not everyone is a nerd like you and only casually watch youtube. Fuck off and take your attitude back to your cave.

I'll watch your another channel video first to get ready for this one 😉

Wobbly building + sunlight focusing= random death ray

Another weird place where math shows up: you can find r = 2+2sin theta in coffee mugs

Nice

tl;dw: Everything is a harmonic oscillator.

Nice video.

That poor lemon

When I was in the military we would break step while marching over small bridges.

The sun being the cause of a hot pool??! crazyyyyyy

There is a law in germany that forbids you to March in unison over bridges

All these examples are from Matt Parker's book "Humble Pi".

Hello. I'm looking for information about quantization matrices in mpeg1 video encoding. I have hardware Video CD card based on cl450 chip by c-cube from 90's. There is super good software t-mpeg encryptor to encode your own videos. I can understand bitrate and proportions , litle bit about frame structure but nothing about how to apply those matrices for encoding. It is important as someone was able to squeeze over 2 hours movie on single CD thanks to low bitrate settings! All best!

Sorry i'm new. But aren't 2 concentric spring equal a single string with ktot = k1+k2 ? what's the difference between put 1 spring with k = k1+k2 and 2 nested spring with k1 and k2 ?

Im upset. I finished this video and told myself: i better watch that new video before i forget. I feel like when you eat fast food and realize you already ate all your 🍟 fries.

Any Engineering Design Subject Class starts... Tacoma Narrows Bridge: Ah...here we go again.

Every KZreadr I watch who is sponsored by Curiosity Stream produces way better content than the stuff that is on Curiosity Stream.

The Vegas hotel AND the London "Walkie Talkie" were both designed by the SAME inept architect Rafael Viñoly.

If you studied engineering, then you would've seen the Tacoma bridge video in the first lecture.

@massimookissed1023

4 жыл бұрын

Hopefully there's a mention of the Regency Hyatt, too.

So if I were to be in an animated movie, my hair would be a *spring* ?

@aidanwoodward3975

3 жыл бұрын

Yes yes and yes

ah yes, the spanish inquisition of the universe

I always expect math and physics, lol

Hello, I am a high school student, Hrithik and I will be doing mathematics. I have a question- What is mathematics all about? is mathematics problem solving for theorem proving? How will i generate new mathematics?will it happen by proving theorems or by solving problems? there is a difference between how mathematics is taught in school and how it is actually done. Problems in textbooks take 5 minutes or 10 minutes or 20 minutes but that is very different from research mathematics. like when we have to create mathematics then there is no time limit. what should I do like should I spend time on proving theorems or should I solve questions. some people say both go hand in hand. For example, in geometry i can do two things, i can start proving all the theorems or i can just see the theorems and then do the exercises. What should be done? (Not just for geometry but the question pertains to all the fields) I want to do becomea research mathematician and do original research. So in that respect how should i procede? Thank you, Hrithik Singh.

smooth lmao

YAAUYAYAYAYAYA

this comes to an idea to why the pyramid was built in ancient egypt, it is probably a purpose to generate illumination of the city at night. As how the pyramid was shaped as a prism( covered with limestone and a gold capstone), the prism like structured can create an array of light distribution by the light being reflected by the moon to create illumination across the city. Who knows? great wonder nevertheless

I notice at .44 time dilation equation is shown not sure of the otheer equations. very interesting thanks for computers and matric transformations,

@theodoresweger4948

9 ай бұрын

excuse my spelling have a handicap...

Humble Pi, Matt Parker?

An even more extreme, and embarrassing for the architect , example of unwanted concentration of reflected light was experienced by unlucky folks around the Frank Gehry designed Disney Concert Hall in Los Angeles. Check out the story. Oh, one other thing, the Tacoma Narrow's Bridge had a nickname given to it, before it shook itself apart .... Galloping Gurty was what the local press called it. Every Civil/Mechanical/Structural engineering student learns about that engineering mega-failure in their introductory coursework.

nice

Dakoma bridge wasn’t resonance! It was very similar, the shape was made so that if it was ever to twist, it would result in it catching wind, twisting to the other side, catching wind etc. There was not resonance, just a constant force applied under changing angles.

Damn!! What is that outro music!!!

It was flutter that destroyed the original Tacoma Narrows Bridge, not resonance.

Just to sum up this video, physics are involved in building things.

Is the effect of the shaking tower the same as timing the swing-pushes just right?

@massimookissed1023

2 жыл бұрын

Yes.