thanks for putting me on the NSA watchlist

@freaksh0w991

7 жыл бұрын

MWB Gaming lol

@radwizard

7 жыл бұрын

Every American is on the NSA list. The Government is scared of us and collects all our data. Thank you Snowden. So if your hard drive crashes, just ask Obama for the back up. ;)

@mwbgaming28

7 жыл бұрын

im not american im australian but i bet the NSA is still spying on me also i think il have to purchase the backup from trump obama would give it to me but trump would probably try to make me pay

@micnorton9487

7 жыл бұрын

MWB Gaming oh, Obama would make you pay, but TRUMP will make you pay with your daughter... sorry for the bad joke if you actually HAVE a daughter....

@mwbgaming28

7 жыл бұрын

lol no offense taken trump would make me pay with both lol

I get to listen to a lecture from one of the most prestigious universities in the world for free, and I can pause and rewind it at my whim. Think about that for a second...!

I am a physicist and this is one of the clearest and well organised explanation to the layman and scientist on this topic - excellent presentation.

@onetimegacct4496

5 жыл бұрын

I am a chemist and this guy has no clue what is going on. Kinetic energy of fission products? Really? No mention of mass defect and the actual physics that is going on? This is disinformation pure and simple. I mean , he is an associate professor of public policy, associate! It shows. This man is in no way qualified to speak on this subject.

This professor is such a great speaker. Easy to understand even if you are not physics major.

Black SUV just pulled up next to my house.

kim was lit when his boys found this

@jhyland87

5 жыл бұрын

What?..

Why am I mesmerized by this deadly apocalyptic subject?

Never though I would get the basic understanding, well taught, not locked in explaining in complicated terms at all, so well delivered. Was always wondering how they can be sooo powerful, now that guessing can rest :P

Thanks James Cameron for an excellent 101 lecture.

@teaski3700

7 жыл бұрын

No budget to steep, no sea to deep. That's who? It's him, James Cameron.

@dannygjk

6 жыл бұрын

!?

@andrewe3165

6 жыл бұрын

Michael Corcoran Explains why his movies are loaded with bombs.

@ropersonline

6 жыл бұрын

@Dan Kelly: It's a joke. Michael is saying Professor Bunn appears similar to James Cameron - and indeed there is a vague resemblance.

@pendejo6466

6 жыл бұрын

Dan Kelly: A nuclear bomb took down the Titanic, and James Cameron attempted to tell the story with DiCaprio.

Can you imagine going back in time to WWII and telling people "you know that super secret tech you're all working on? Yeah... we call this KZread"

A good portion of this info was in my course of study for a power reactor operator's license. Nice refresher.

my father was at Castle Bravo in 1954.

56:35 Minor detail about hot air rising. I think he is mixing up cause and effect. You do not start with hot air rising and then colder air rushing in below to "prevent a vacuum". The hotter lighter air causes a lower pressure above the colder heavier air. This causes the cold air to be pushed up from its sides (as the side pressure around the cold air is higher than the pressure from above), which then in turn pushes the hot and lighter air upwards. Think about an air bubble under water. Water on the top of the bubble flows down on its sides and fills up the bottom of the bubble. The permanent movement of water from the top to the bottom makes the air rise up. There is no water rushing in from below to fill up any vacuum.

Fascinating. Great presentation.

so fascinating!!! i love learning about nuclear bombs!!

I personally loved this lecture, and the lecturer did a fantastic job explaining everything, I spend hours a day watching and listening to lectures about nuclear physics and explosives etc because they interest me alot, I wish New Zealand universities would offer a degree or diploma in nuclear physics or pyrotechnics and explosives, or even an online course, if they did do this I would be there first student

@endtimesasmr2590

8 жыл бұрын

+SuperBking1340 One method is to observe the path of a charged particle as it collides with a neutral particle.

@endtimesasmr2590

8 жыл бұрын

SuperBking1340 Good question, I'm not entirely sure.

@endtimesasmr2590

8 жыл бұрын

SuperBking1340 Now that I think about it more, using the mass of the two given particles and the angle of recoil from the charged particle, it could be determined what direction the neutral particle rebounded in.

@marklister2400

8 жыл бұрын

+SuperBking1340 good question, but unfortunately I don't know the answer to that, you would need to ask the people that assemble nuclear weapons for the answer to that

@robertsosich9320

8 жыл бұрын

+mark lister Im from new zealand too and really enjoyed this lecture

I grew up in the '60's and '70's, and while I missed the Civil Defense drills in schools, I had found a lot of books by the agencies in a landfill in the valley below our house, across the river from the US Naval Academy. Those books, plus reading "Triumph" by Philip Wylie, had me watching every contrail in the sky. Those neurosis-inducing nukes...... Test pilots would occasionally issue a sonic boom over the area, and one day a Harrier dropped in to hover over a parking lot at the Academy. The initial sonic boom and the subsequent roar had us running for cover..... like that does ANY good within ten miles of a nuke. Thanks for sharing this extremely well-done lecture.

Very good lecture. Easy to understand.The science to make it explode is well known. Not exactly top secret. The means to do it is the hard part.

Thanks a lot for the video. Very informative. That is one morbidly fascinating device

Trinity Slide @ 2:15 is not a picture of Trinity, but a picture of Shot Badger from the Upshot-Knothole series in 1953.

Wonderful, it's absolutely right of what I was searching for. Thanks alot

awesome video , i love learning about things like this im gona look into seeing if you have any other lectures on different subject's this kind of stuff is so fascinating to me honestly had no idea it was so complicated and i enjoyed learning about how they use this type of thing to produce regular power for people to use, or factory's ect. agin awesome video !! thanks

Fascinating and wonderfully presented. Thanks.

Thanks for the upload

Outstanding. Thank you.

Fascinating! Thanks for the clear explanation.

If I wasn't on a list from all the other cap I watch.....I definitely am now

@drzecelectric4302

6 жыл бұрын

some dude haha yup. I’m a Feynman fan so naturally this pops in my feed.

great video! thanks for sharing!

Dr. William Penney, the British scientist who developed the British nuclear weapons, had a permanent grin on. Look up a photo (any) of Dr. Penney and you can be sure he is flashing his toothy grin. Maybe he was Stanley Kubrick's model for Dr. Strangelove. Penney was knighted for his contribution to the nuclear arms race.

"All the energy and matter that has existed still exists. Matter does not create energy of itself. The actions of matter enable energy to become manifest".

Amazing video. Though obviously a very complex and chemistry / physics topic, professor Bunn does a fantastic job of explaining things clearly and in a simplified manner.

Well done sir.

thanks for sharing this. very clear explanation and it was very useful for me to understand.

He leaves the fun stuff out but a nice rendition of basics of old nuclear weapons design

Outstanding lecture.

I'm building a bomb for my dad for his birthday and I want it to be big. However my yield seems to be consistently below the 50 kiloton mark even when I use enough material for a 100k or so bomb. I've got the hollow sphere and the air gap and the explosive lenses mostly dialled in, but still I end up with this figure "8" blast pattern that is not very optimal Can you please help? I only have enough fissile material for two more bombs so I can really have only one more test before I make the present.

@michaelcawdron3378

6 жыл бұрын

Use the fissile material for the remaining 2 bombs for 1 bomb.

@Evan_Bell

5 жыл бұрын

You've got enough material for a 100kt explosion? Is that assuming the impossible efficiency of 100%, are are you assuming maximum possible efficiency of 33, but only getting 16%? 16% is pretty good. Are you using uranium or plutonium? Boosted or unboosted? Reflected or unreflected? Tamped or untamped? How precise is your neutron injection timing?

@WillyWanka

5 жыл бұрын

Some speculate that the yield of a nuclear bomb is dictated by the by its position in celestial space. So, it may fizzle or it may go BOOM.

I was at Trinity in 2007 - tourists took the last of the Trinitite glass from the ground a while back but you can still get some from collectors online.

Many thanks for the lecture though I cannot imagine a situation where I'd need that type of knowledge. :)

Great lecture

Interestingly you can enrich uranium using photo activated uranium salt decomposition. You’ll have to guess the salts that this would work with. This approach relies on the minute differences in the chemical properties of 238 and 235. It only needs recrystallisation equipment. It’s not an economically viable method though.

this vid just auto played when i was napping, just saying whomever might be spying on me lol

great video

Gone fission...

Great information, very informative. Lecture is off the chain, you know you are in the presence of a expert. On the other hand what horrible reality these devices have created. So sad and depressing. So much engineering in the wrong direction. One love y'all.

@masoncooper6649

7 жыл бұрын

CVbeats to be fair more people wouldve died if they didnt bomb hiroshima and nagasaki vs an invasion of japan, the lesser of two evils if you will

Makes me wish i went to college... Great talk. Very interesting!

Fantastic very interesting. This speaker is well worth the effort to listen to. And is so close to perfect as far as keeping every sentence riveting If he can just drop the habit of saying O.K , OK , OK , It's to many oks . He is so interesting I had to persevere, but please play it back and note how often you say ok. Then note how the flow sounds so more interesting when you use far less ok. This is in no way intended to offend, you are well worth the time. In fact I will both like and share. Keep it up you are great , in fact so riveting and interesting , you don't need the ok , ok. Thank you I found your technical explanation perfect OK. Warm regards Grant

Very good video.

Very good teacher.

l love i like this documental exelent job teacher

Great explanation. I enjoyed a lot, thank You. God Bless peaceful countries and lovely people.

Very Interesting, i like your class online, i send you greetings!

So I starting watching this a couple of days ago and heard him suggest The Making of the Atomic Bomb by Richard Rhodes. I finished it and yes it is a page turner. and yes it is very good. If you are interested in history of science you will enjoy this book. the book tells the history of nuclear physics not just an account of los alamos.

Was just looking for a short and sweet answer to fill my curiosity, like modern marvels. Good presentation though.

is it me or he make it sound simple? even i would of used bigger words :/ this man as a gift

We hear about other countries who we don't want to have them, but the truth is the knowledge on how to is easily available, and is taught to students in school....yes even students from other countries no restrictions other than the general admission to the school.

Very informative. Thank you

Love it when he said "people" instead of scientists. Makes us feel like we belong to the same human beings.

and don't forget to watch the 1963 movie "Dr Strangelove, or ..." Still a great and important story.

Amazing! :D

well done ,now everyone got ideas about how to made accelerated nuclear bomb , please continue your favor and give more ideas where to get the materials from ! i think we can buy it from the black market of weapons ready rockets with nu warhead !

Nothing new really, except the breakdown on what's hardest to achieve.

This science made 1sec an eternity of time

I was looking at, like, a LEGO set for Nuclear Weapons on Amazon, but I couldn't find any. Do you think I'll have better luck on Craigs List?

21:15 it's so badass when someone says "that's classified" one day I hope to be able to say it.

I am just interested in how everything works together

Thanks profe. I like how easy you made me understand. Profe stay calm I won't make bombs :-). I'll make a new material none nuclear explosive much said a very steady material I just want to be able to flow out and absorb the energy from this type of reaction. I'll keep watching your videos please keep us learning.

Great video. Great lecture. Is there a similar on nuclear power?

Modern Nuclear Chemistry by Seaborg ... is very useful also ... shake at 10ns is essentially one fission cycle ... 12 ns is one k-meson time ... if you have a doubling every shake ... it does not take long to release a lot of energy ...

@39:38 are you referring to gamma ray detection only? If so, are you stating that cat litter emits a higher count rate (combined Th, U, and P) than *unshielded* enriched Uranium?

Thanks

Why is the CIA following me

Nice video

Well that was interesting.

I find it interesting that a few Manhattan project physicist theorized before the first test that the chain reaction would not stop leading to the end of the planet.

This is a great professor.

well presented

excellent lecture!

This lecturer is brilliant. I'd bet he could make "how paint dries" an interesting topic :) Thanks for the video Belfer Center.

At 15:00 when he's talking about 2/3s critical mass inriched uramium. Is he talking about uranium that's being compressed by an explosion making it completely hypothetical? Or is he saying that if you swing 2 pieces of uranium 235 at each other that there will be a small deadly explosion even before you could hit them together?! Fascinating and good to know if your ever handling nuclear bomb cores.

Awesome lecture thank you.

this is amazing

Fission > fusion > fission > fusion > fission and in the end = huge boom and giant fireball and whole city gone in just one second. Amazing. Its just amazing how smart are some people.

If we could get to Pluto... We can get all the plutonium we'll ever need !!!💥💫🌐

Where can we download the blueprints for 3D printing?

This came up on my recommended list...

I'm 15 minutes in, and realized , D.C. Current is relevant!

Did they invite Iranian nuclear scientists and reps of the Guards of Islamic Revolution to this exciting lecture?

@puncheex2

8 жыл бұрын

+Al Johnson Da.

@suli9135

8 жыл бұрын

No but your racism was

@puncheex2

8 жыл бұрын

This level of understanding of the thermonuke is trivial. However, it was only arrived at after 40 years of experimentation and testing, which might lead you to the clue that a lot is unsaid here. Go read Clancy's "The Sum of All Fears" to put yourself to sleep.

@eatenbytheweasel8366

8 жыл бұрын

+YELLING ARNOLD (IS EVERYWHERE) Got anything better than that?

@suli9135

8 жыл бұрын

eatenbytheweasel americans

now we know.... wish we can make more useful usage of this stuffs.

Neat.

Great lecture! Except the actual process where the energy is transferred from the primary to the secondary (31:00) is not exactly right. The actual process is the ablation of the surface of the secondary, from high energy X-rays filling the bomb case, exploding it inward. It's not the radiation pressure. The surface is rapidly heated and ablates away, propelling the material inward to compress the secondary.

@dannygjk

6 жыл бұрын

If you want to get technical, wouldn't it be the mass and radiation transferred from the primary to the secondary?

@widg3tswidgets416

6 жыл бұрын

Eric Wesson tellar-ulam

@widg3tswidgets416

6 жыл бұрын

Bryan Carter Even if you assert that what you said is correct, the radiation pressure is what starts the main reaction in the secondary. A distinction without a difference.

@tristenturner832

6 жыл бұрын

if we are getting technical, it was radiation pressure. all momentum is carried by photons

@Evan_Bell

5 жыл бұрын

False. radiation pressure results from the kinetic energy of the photons (yes, photons, despite having mass, have an energy associated with them). Ablation pressure is a different mechanism.

AS A MECHANICAL MINDED IT IS HARD TO DEFINE FOR ME THE SYNOPSIS IS GOOD

This shit crazy!,I got curios about nuclear bombs when I read unbroken.

If that whole putting the dueterium into the pit to cause a fusion reaction at the same time as the fission isn't the classified part, I wanna know what the classified part is.

@kurtilein3

5 жыл бұрын

Miniaturisation. The smallest fission bombs in the US arsenal are literally the size of a football. The smallest high-yield fusion bombs are smaller than the fission bombs other nations have.

Great video+speaker...even for an average IQ guy like me-

@markwinberry8095

7 жыл бұрын

Just the fact that you underestimate yourself is a sign of a higher IQ. Plus I don't think average IQ blokes Care about this stuff. They are watching Britney Spears videos.

@markwinberry8095

7 жыл бұрын

Not to mention look how many people have watched pt 1 vs pt 2. I bet most of the numbers who started pt1 never finished Pt1 let alone pt2.

54:28 that looks like a soap bubble.

Loved this lecture; going on to watch part two. I really want to formally study this myself at an actual institution rather than on my own during my free time but I don't have the funds to do this. I was surprised to see just how much of this I already knew even though I never had a chance to take a physics class when I was still in high school. A majority of it was more of review for me, but a fair bit of it was completely new to me. I personally have always been interested in the prospect of building a working efficient fusion reactor.

The Frugal Gourmet know a lot about nuclear physics.

Watching this and repeatedly hearing about the astronomical orders of magnitude of heat and pressure that is released in these reactions, I wonder if we could harness this power to mimic the natural processes which create petroleum. Any thoughts about that?

Critical Mass in the Critical Area...BOOM!

31:07 According to en.wikipedia.org/wiki/Thermonuclear_weapon#Compression_of_the_secondary there are three proposed theories of how the energy is transferred to the secondary: - radiation pressure exerted by the X-rays - X-rays creating a plasma in the radiation case's filler (a polystyrene or "FOGBANK" plastic foam) - Tamper/Pusher ablation

@soylentgreenb

7 жыл бұрын

It's obviously not radiation pressure because that's a piss-weak effect compared to ablation pressure.

@josephastier7421

6 жыл бұрын

The x-rays cause the tamper surrounding the secondary spark plug to ablate so explosively that it causes a rocket effect. The tamper blasts cylindrically inward from all sides, compressing the spark plug to fission pressure + temperature. Ignition of the spark plug then pushes the tamper back out again, which kills the reaction before it even leaves the bomb casing. It happens so fast that they had to load the first H-bombs with paraffin to slow the neutrons from the primary down so they wouldn't reach the spark plug before it had compressed all the way.