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Phanatic posted:Not sure how I missed hearing about this: The thing I don't get about this is how did the entire crew die when the ship took a week to sink?
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Jan 16, 2018 05:39
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Probably catastrophic initial contact/first 24 hours, and then a week to gather the bodies. E: the crew areas, even on a ship that large, only take up a very small amount of space relative to the size of the ship. An overwhelming fume situation could have taken out the entire crew quarters in a very short amount of time. spookykid fucked around with this message at 05:49 on Jan 16, 2018 |
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Jan 16, 2018 05:45
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0toShifty posted:The thing I don't get about this is how did the entire crew die when the ship took a week to sink? The article says the rescue team couldn't spend long on board due to the heat and toxicity. I'm guessing the crew died very quickly after the initial accident and it was a ghost ship for that week.
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Jan 16, 2018 05:46
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0toShifty posted:The thing I don't get about this is how did the entire crew die when the ship took a week to sink? They died in the initial incident. They were able to recover some of the bodies before it sank.
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Jan 16, 2018 05:46
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Phanatic posted:Ugh. 10 minutes in, it repeats completely uncritically the myth that when they set off the Trinity bomb there was a concern that it would ignite the atmosphere and kill all life on earth. "And they did the test anyway." I mean, there was some concern there. That's why they did the math. The math showed it couldn't happen. They doublechecked the math, and it still couldn't happen.
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Jan 16, 2018 08:06
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That never made sense to me. How do you 'ignite the atmosphere'? Like... It's nitrogen, carbon dioxide and oxygen. No matter how much heat I dump into that mix, I still only see two legs of the fire triangle, and no fuel.
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Jan 16, 2018 08:21
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Moto42 posted:That never made sense to me. Nitrogen burns if you believe hard enough.
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Jan 16, 2018 08:24
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The fire triangle does not fully explain the chemistry of fire. It is expected that fifth graders will not be starting nuclear detonations.
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Jan 16, 2018 08:26
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Moto42 posted:That never made sense to me. The fear was actually a selfsustaining fusion reaction between the nitrogen atoms in the atmosphere. Pretty ridiculous now, but definitely something I understand wanting to check in the early days of nuclear physics. Keiya fucked around with this message at 12:06 on Jan 16, 2018 |
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Jan 16, 2018 08:28
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Moto42 posted:That never made sense to me. Not a chemical reaction, think of what reactions go on in the giant ball of fire in the sky (unless you live in Seattle) https://www.metabunk.org/debunked-scientists-risked-destroying-the-earth-during-nuclear-tests-and-cern.t692/ It's entirely implausible, the heat from the fission reaction is no where near hot enough and contained enough to come even close to setting it off.
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Jan 16, 2018 08:38
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Ah, ok. That makes a little more sense as a thing to be worried about. I always heard 'ignite' and thought 'chemical fire'. The idea that they worried about a self-sustaining nuclear reaction never crossed my mind. Although, a self sustaining fusion reactor would be pretty easy to build, if you had enough hydrogen.
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Jan 16, 2018 08:44
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They made a documentary about the Van Allen radiation belt catching fire. Maybe some of you have watched it... https://www.youtube.com/watch?v=LrpM4_fPIT4
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Jan 16, 2018 08:45
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Moto42 posted:Ah, ok. That makes a little more sense as a thing to be worried about. The full story behind it is that, before the Manhattan Project scientists had finished solving all the math they needed to do in order to build the bomb, one of them said "hey, is it possible that this detonation could trigger runaway fusion between nitrogen atoms in the air and consume the whole atmosphere?". No one in the world had yet produced a fission bomb or a fusion reaction of any kind, so no one was really sure what might happen, and no one had tried to mathematically work out the likelihood of that particular scenario. So, the question having been raised, the scientists did the math on it later that same day and concluded that no, it was probably not possible to trigger such a fusion reaction and there was no need to worry. Over the next few months they would conduct further research and determine exactly how impossible it was (extremely), and by the time of the Trinity test no one had any concern at all. The more you know.
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Jan 16, 2018 08:58
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Moto42 posted:Although, a self sustaining fusion reactor would be pretty easy to build, if you had enough hydrogen. 1.51 x 10^28 Kg? Yea, I suppose most engineering challenges are simple if you can wave a magic wand 
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Jan 16, 2018 08:59
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Sagebrush posted:So, the question having been raised, the scientists did the math on it later that same day and concluded that no, it was probably not possible to trigger such a fusion reaction and there was no need to worry. Over the next few months they would conduct further research and determine exactly how impossible it was (extremely), and by the time of the Trinity test no one had any concern at all. It didn’t stop them from taking bets. 
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Jan 16, 2018 09:22
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Platystemon posted:It didn’t stop them from taking bets. What was the plan if you won the bet? Use the money to buy a new atmosphere?
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Jan 16, 2018 10:09
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That strange guy posted:What was the plan if you won the bet? For about half a second you'd be the smuggest bastard in the world.
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Jan 16, 2018 10:59
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That strange guy posted:What was the plan if you won the bet? They took bets on what the yield would be. Fermi pissed off a lot of brass because his wager was a yield of zero*. I recall reading in Richard Rhodes' Dark Sun that the rumor about atmospheric ignition happened during the first thermo-nuclear detonation, and that it was Teller (or von Neumann) that provided the paper explaining why it wouldn't happen. *Fermi managed to calculate the actual yield for himself, by throwing tissues on the ground during detonation and observing their displacement.
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Jan 16, 2018 12:58
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quote:Colombia motorway bridge collapses killing nine workers Uff, I guess better now than once it's finished? Still a huge fuckup and sucks for all involved.
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Jan 16, 2018 13:45
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Are they going to have to pull the other side down and start again from scratch?
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Jan 16, 2018 14:21
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Yeah at least that's what I had to do every time I hosed up in Bridge Builder.
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Jan 16, 2018 14:27
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mobby_6kl posted:Yeah at least that's what I had to do every time I hosed up in Bridge Builder. Just build the remaining pillar twice as tall and hang the whole bridge off it 
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Jan 16, 2018 14:40
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If they still have enough money to clean up the mess and rebuild the collapsed half, it's probably fine. The cable stays will be able to hold up that existing part of the bridge pretty much indefinitely. If they don't have enough money to finish the road any more, it could end up being a pretty impressive bridge to nowhere.
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Jan 16, 2018 14:41
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Kickass bungee jumping platform.
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Jan 16, 2018 15:06
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Keiya posted:The fear was actually a selfsustaining fusion reaction between the nitrogen atoms in the atmosphere. Pretty ridiculous now, but definitely something I understand wanting to check in the early days of nuclear physics. Actually the secret fear was that the Nitrogen atoms would get all pissed off that we started to use nukes that they'd want to be free from the planet. Explosively
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Jan 16, 2018 15:49
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Jabor posted:The cable stays will be able to hold up that existing part of the bridge pretty much indefinitely. I am sure they thought that about the side that is on the ground.
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Jan 16, 2018 16:00
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Gorilla Salad posted:Kickass bungee jumping platform.
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Jan 16, 2018 16:33
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Serephina posted:1.51 x 10^28 Kg? Yea, I suppose most engineering challenges are simple if you can wave a magic wand 
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Jan 16, 2018 18:21
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mobby_6kl posted:http://www.bbc.com/news/world-latin-america-42701262 Crazy. I just drove past this bridge at the beginning of the month. If it had already been completed, I would have driven *on* it. Honestly I'm surprised more things don't randomly fall down around here. I should probably make a post with all the horrible OSHA poo poo I find just walking around Bogotá.
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Jan 17, 2018 01:50
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mobby_6kl posted:http://www.bbc.com/news/world-latin-america-42701262 quote:Construction officials said that fortunately not many workers were on the bridge at the time of the collapse as staff were receiving a safety briefing.
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Jan 17, 2018 03:36
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SlightButSteady posted:I recall reading in Richard Rhodes' Dark Sun that the rumor about atmospheric ignition happened during the first thermo-nuclear detonation, and that it was Teller (or von Neumann) that provided the paper explaining why it wouldn't happen. Yeah the paper is by Teller, along with Konopinski & Marvin. They basically come to the conclusion, after a bunch of math, that atmospheric ignition is very unlikely, but it’s an interesting idea. Sorry about the scan quality, I think it was done in the early 90s at a very low resolution. The paper is from 1946, and was declassified in 1979.
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Jan 17, 2018 10:19
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Leave it as is, put up a webcam. dibs on 11hundredfoot8.com
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Jan 17, 2018 12:40
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I like this part of the atmospheric ignition story:Richard Hamming posted:Shortly before the first field test (you realize that no small scale experiment can be done—either you have a critical mass or you do not), a man asked me to check some arithmetic he had done, and I agreed, thinking to fob it off on some subordinate. When I asked what it was, he said, "It is the probability that the test bomb will ignite the whole atmosphere." I decided I would check it myself! The next day when he came for the answers I remarked to him, "The arithmetic was apparently correct but I do not know about the formulas for the capture cross sections for oxygen and nitrogen—after all, there could be no experiments at the needed energy levels." He replied, like a physicist talking to a mathematician, that he wanted me to check the arithmetic not the physics, and left. I said to myself, "What have you done, Hamming, you are involved in risking all of life that is known in the Universe, and you do not know much of an essential part?" I was pacing up and down the corridor when a friend asked me what was bothering me. I told him. His reply was, "Never mind, Hamming, no one will ever blame you."
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Jan 17, 2018 13:07
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Platystemon posted:I like this part of the atmospheric ignition story: Well... he's not wrong.
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Jan 17, 2018 13:13
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Xpost from the China thread:
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Jan 17, 2018 18:32
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Cross-post from the Crappy Construction Threadpeanut posted:NJPW vs Old House Makes me miss the demo part when I worked construction.
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Jan 17, 2018 19:04
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Russian man gets sucked into a snowmobile He walks it off https://www.youtube.com/watch?v=2_pfYZotC84
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Jan 17, 2018 20:41
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xergm posted:Russian man gets sucked into a snowmobile Their first reaction to seeing someone's entire body get sucked into running machinery is laughing.
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Jan 17, 2018 21:10
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They're laughing like that's the prank they pull on new guys. There isn't that much that can maul you up in there, but he's lucky he jammed against the belt and the driver didn't give it much beans.
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Jan 17, 2018 21:39
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Jan 17, 2018 21:42
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