Search found 858 matches

by p1t1o
Tue Aug 21, 2018 2:39 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

The short answer is - yes, a large amount of energy (no matter the form) dumped into a small volume of air will indeed resemble a nuclear explosion. The exact mechanisms of energy propagation will differ, but the gross end result will be the same - thermal flash, plasma fireball, shockwave and a mu...
by p1t1o
Fri Aug 17, 2018 7:59 am UTC
Forum: Science
Topic: Gravitation 'Beach'
Replies: 11
Views: 665

Re: Gravitation 'Beach'

An ocean wave can be made to change speed, and when it does so, its amplitude changes. I dont think a gravity wave can travel at anything but c?
by p1t1o
Wed Aug 15, 2018 1:39 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

The short answer is - yes, a large amount of energy (no matter the form) dumped into a small volume of air will indeed resemble a nuclear explosion. The exact mechanisms of energy propagation will differ, but the gross end result will be the same - thermal flash, plasma fireball, shockwave and a mus...
by p1t1o
Tue Jul 17, 2018 1:36 pm UTC
Forum: Science
Topic: Consequences of climate change
Replies: 80
Views: 11745

Re: Consequences of climate change

I think I vaguely recall something about the global temperature increase causing expansion of the atmosphere, which would have a real (but minor) impact on LEO satellites. And something about when very large masses of ice melt, or shift, the crust underneath can "relax" a bit, changing top...
by p1t1o
Mon Jul 16, 2018 8:19 am UTC
Forum: Science
Topic: Cooling gas by expansion
Replies: 17
Views: 2005

Re: Cooling gas by expansion

Actually I dont want stealth, Im trying to falsify the hypothesis that the "hydrogen steamer" space-stealth design can work. Because if it does everything it says on the tin, its pretty damn stealthy. And if it stands up to all the questions I can think to put to it, then I can consider it...
by p1t1o
Wed Jun 13, 2018 5:09 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

Soupspoon wrote:What if I paint the door onto a brick wall? Will it work the same as painting a tunnel onto a rock wall?


These appear to be opposite cases, only one of them will resemble the previous example.
by p1t1o
Wed Jun 13, 2018 3:46 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

I was concentrating on the fate of the weapon but you are right of course. Bullet will already be moving and there only one way to stop it.
by p1t1o
Wed Jun 13, 2018 3:33 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

In high-energy environments, flesh can be approximated with water. If you block the barrel of a gun with just a few inches of water, there is a good chance of barrel rupture - plenty of empirical evidence for this on youtube. Ergo, an arm/finger in the barrel will certainly get smashed to poop, but ...
by p1t1o
Fri Jun 08, 2018 10:20 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

Luke Cage. He is bulletproof , for some reason. Judging by the sound-effects, bullets bounced rather than splashing. It's very silly. Because Science did a thing about it and someone was questioning his maths, so I checked out the maths too and ... like I said, Kyle pulled those numbers out of his ...
by p1t1o
Fri Jun 08, 2018 8:11 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

Would the bullet just splash ? Well i mean that is a video of a bullet doing exactly that... In ballistics, this is called "Interface Defeat" - where the difference in strengths/hardness overcomes the relationship between velocity, mass and impact depth. Very high accelerations can be obs...
by p1t1o
Fri Jun 01, 2018 3:44 pm UTC
Forum: Science
Topic: Cooling gas by expansion
Replies: 17
Views: 2005

Re: Cooling gas by expansion

Does this concept have any bearing on the subject? https://en.wikipedia.org/wiki/Free_expansion Here it states that free expansion into a vacuum is isothermal, no temperature change. However it also states that no work must be done by the expansion - although the "work" they refer to is pu...
by p1t1o
Thu May 31, 2018 6:49 pm UTC
Forum: Science
Topic: Cooling gas by expansion
Replies: 17
Views: 2005

Re: Cooling gas by expansion

thoughtfully wrote:Describing all black-body emissions as "IR" is confusing, but it's a common enough mistake.


Well we aren't going to be looking for these things with radio telescopes, but I see your point ;)

Wait, or are we?

Probably a discussion for another thread.
by p1t1o
Thu May 31, 2018 5:09 pm UTC
Forum: Science
Topic: Cooling gas by expansion
Replies: 17
Views: 2005

Re: Cooling gas by expansion

Temperature as a concept doesn't work too well in a gas with zero pressure. You should be able to cool the ship though. Aerosol cans will lose heat while spraying into open air, and I don't think the ambient pressure is making a strong contribution. Can't make a strong argument/reference for that o...
by p1t1o
Thu May 31, 2018 3:38 pm UTC
Forum: Science
Topic: Cooling gas by expansion
Replies: 17
Views: 2005

Cooling gas by expansion

So I have a compressed gas in a tank. 1) I release it through a nozzle into an infinite vacuum, like say, space. Does the gas cool to absolute zero due to infinite expansion, or is there some limit to cooling? Does the mean-free-path have anything to do with this? 2) Same question but this time the ...
by p1t1o
Thu May 31, 2018 10:22 am UTC
Forum: Science
Topic: Deep Drill Industry
Replies: 17
Views: 2247

Re: Deep Drill Industry

For what its worth, global Osmium production is (according to https://mmta.co.uk/metals/os/) less than 100kg/yr Thats still a collosal amount of water to process, but then Osmium is one of the rarer elements in seawater. Its one of the rarest on the planet. I dont think Osmium is a great measure of ...
by p1t1o
Wed May 30, 2018 2:10 pm UTC
Forum: Science
Topic: How much is 1e340 j of energy?
Replies: 19
Views: 1872

Re: How much is 1e340 j of energy?

So if you did bring 1e340J into being somehow, how would you describe the predicted effects? Is it a large small enough number that "collapse to a singularity" or "complete destruction of the universe" are reasonable choices? Or is the number so large as to make even those simpli...
by p1t1o
Tue May 29, 2018 11:16 am UTC
Forum: Science
Topic: Deep Drill Industry
Replies: 17
Views: 2247

Re: Deep Drill Industry

On a more practical level, I now wonder about the inland Ivory Coast and Burkina Faso-ish geology. I must check some topological and geological maps! (Then narrow down which, maybe Russian, location might be near that lone Eurasian purple pixel.) Looks like that purple spot is practically right und...
by p1t1o
Tue May 29, 2018 10:28 am UTC
Forum: Science
Topic: How much is 1e340 j of energy?
Replies: 19
Views: 1872

Re: How much is 1e340 j of energy?

For example, Graham's number (Googolplex is sooo 1995) is so large it makes 1e340 look like...well its very much larger, there are not enough words to explain how big it is other than the mathematical notation... You think that's big? How about a googleplex to the Graham's number power, factorial, ...
by p1t1o
Mon May 28, 2018 4:33 pm UTC
Forum: Science
Topic: Deep Drill Industry
Replies: 17
Views: 2247

Re: Deep Drill Industry

It is going to be a very long time before "get it from space" becomes the cheapest/easiest option for anything.

Not when there are gigatons of almost every element dissolved in the oceans just sitting right on the surface of the Earth.
by p1t1o
Mon May 28, 2018 4:19 pm UTC
Forum: Science
Topic: How much is 1e340 j of energy?
Replies: 19
Views: 1872

Re: How much is 1e340 j of energy?

The Tsar Bomba is the biggest nuclear bomb ever built. It was 50 megatons, and (thus) put out 209200000000000000 joules (2 x 10 17 joules), but couldn't sustain the reaction for more than a fraction of a second. (It was enough). A watt is a joule per second , so the total power output of the bomb i...
by p1t1o
Thu May 10, 2018 11:15 am UTC
Forum: Science
Topic: Relative Light Speed
Replies: 15
Views: 2549

Re: Relative Light Speed

I thought string theory was still "up in the air"?

And arent the loops particles rather than spacetime itself?
by p1t1o
Fri May 04, 2018 4:00 pm UTC
Forum: Science
Topic: neutrino question
Replies: 18
Views: 2128

Re: neutrino question

Im not happy with Honestly, if you won't understand any answer that's got too much quantum in it, you're going to have to settle for remaining not happy with the explanations given. Oh I can accept it, its only one of several mind-bending things that I have heard happen in the quantum world, but I ...
by p1t1o
Fri May 04, 2018 2:40 pm UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

C4 is reasonably stable (it can’t be detonated accidentally). Just carve whatever you want to be private into a block of it, and set it up to detonate if somebody comes a-snoopin. In fact, I bet you could roll it out into sheets (thicker than paper) and print onto them... I only mentioned war and p...
by p1t1o
Fri May 04, 2018 2:37 pm UTC
Forum: Science
Topic: neutrino question
Replies: 18
Views: 2128

Re: neutrino question

So mass/energy is conserved due to a change in velocity. That makes a certain sense but Im not happy with something changing speed without a reaction force - or is that way too "classical physics" for this subject? I saw the word "superposition" there, is it perhaps a quantum wei...
by p1t1o
Fri May 04, 2018 1:16 pm UTC
Forum: Science
Topic: neutrino question
Replies: 18
Views: 2128

neutrino question

First, neutrinos are certainly not my field. I just read that neutrinos come in 3 "flavours" each flavour having a slightly different mass, and that neutrinos can spontaneously convert between flavours in flight. This must mean that they change mass, which to me raises conservation-of-ener...
by p1t1o
Fri May 04, 2018 12:59 pm UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

Ok fine, the warehouse has a 1megaton nuke under the floor, the tilt mechanism sets off the device. Yes Im still including the tilt. For extra security ;) *** ...if you know the initial state and the forces acted on it, then it is completely predictable. Sure, if you have this level of knowledge of ...
by p1t1o
Thu May 03, 2018 6:55 pm UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

You could spell out your information will 2mm ballbearings on a huge flat floor, like a warehouse. Men in Black come calling? Just tilt the floor by a degree or two. Or Dominos. Spell out your information with dominos. MiB come around? You know what to do. Or you could use an atomic force microscope...
by p1t1o
Thu May 03, 2018 5:10 pm UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

Tyndmyr wrote:Flash paper is basically the commercial solution to this, yes.

That said, a white phosphorous grenade will also do the job just fine, with entirely normal paper.


Classic internet XD
by p1t1o
Thu May 03, 2018 8:09 am UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

As far as I know, you still cant beat one-time-pads for secure encryption.
by p1t1o
Wed May 02, 2018 2:54 pm UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

Crypto isnt always the best solution, for example if you want to draw an impromptu map, or want it to be readily readable. Tablet computers with full disk encryption are a thing, including pens for doodling maps. Configure them to shut down when leaving the facility (i.e. when out of reach of the w...
by p1t1o
Wed May 02, 2018 8:11 am UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

You know those wax tablets the Romans used to use?

https://upload.wikimedia.org/wikipedia/ ... _times.jpg

Replace wax with plastic explosive.
by p1t1o
Tue May 01, 2018 8:44 am UTC
Forum: Science
Topic: Quick Burning Paper
Replies: 47
Views: 4307

Re: Quick Burning Paper

An idea I had was to make the paper out of gun-cotten . If you're set on this approach, "flash paper" made of nitrocellulose (otherwise known as guncotton) is absolutely a thing. https://en.wikipedia.org/wiki/Nitrocellulose#Other_uses https://www.youtube.com/watch?v=b2zp_TQfzCo Though I t...
by p1t1o
Tue Apr 24, 2018 2:10 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

Sableagle wrote:
That's not something you want to bring to a knife fight, is it?


Only if you love LOSING

;)
by p1t1o
Mon Apr 23, 2018 7:47 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

A black hole bomb could never be any more powerful than a matter/antimatter annihilation bomb of equivalent mass, so unless your target is gas-giant sized, thats probably your first choice. I can't think of any interesting way to use a black hole on a car-sized target without reducing most of the pl...
by p1t1o
Mon Apr 23, 2018 3:38 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 85596

Re: Science-based what-if questions

According to Bulbapedia, Gardevoir is able to see the future using its psychic powers. Additionally, it is able to create small black holes, distort dimensions, and support itself without feeling the pull of gravity. Just how small would a black hole have to be for it to be useful in a one-on-one f...
by p1t1o
Mon Apr 23, 2018 3:29 pm UTC
Forum: Science
Topic: Effects of CO2 fraction on human health below clinical levels
Replies: 2
Views: 1366

Re: Affects of CO2 fraction on human health below clinical levels

According to the RTECS toxicology database (a prevalent database used in the chemicals industry) the "lowest published toxic concentration" in humans - (for the uninitiated, this doesnt mean "toxic" as in "Agh! Ack!" but "toxic" as in "we detected a toxic...
by p1t1o
Tue Apr 17, 2018 8:42 am UTC
Forum: Science
Topic: Ester Naming Conventions
Replies: 4
Views: 1891

Re: Ester Naming Conventions

If you make an ester from ethanoic acid and propanol, you get ethyl propanoate. No, that would be from ethanol and propanoic acid, since the -ate is always from the acid just as if you were naming a salt. So your combination would give you propyl ethanoate (or propyl acetate), and likewise propan-2...
by p1t1o
Fri Apr 06, 2018 11:03 am UTC
Forum: Science
Topic: Ester Naming Conventions
Replies: 4
Views: 1891

Re: Ester Naming Conventions

If you make an ester from ethanoic acid and propanol, you get ethyl propanoate.

If your alcohol is secondary, like say, Propan-2-ol, it would form Ethyl Propan-2-oate, simples.
by p1t1o
Thu Apr 05, 2018 8:23 am UTC
Forum: Science
Topic: Are Vitamin Supplements Toxic to Non-Human Animals?
Replies: 14
Views: 2515

Re: Are Vitamin Supplements Toxic to Non-Human Animals?

Could just call it "medication"?
by p1t1o
Thu Mar 22, 2018 4:53 pm UTC
Forum: Science
Topic: Free floating "gas dwarf"?
Replies: 8
Views: 2213

Re: Free floating "gas dwarf"?

Considering that the surface of Venus is already far too hot and pressurized for habitation, I don't think habitability questions really depend on whether there's a solid core or not. The habitable zone is going to be up somewhere near the top of the atmosphere regardless. Ah, good point. So we'd b...

Go to advanced search