Search found 640 matches

by p1t1o
Thu Dec 01, 2016 9:39 am UTC
Forum: Science
Topic: How to Make a Blender Quiet
Replies: 27
Views: 2236

Re: How to Make a Blender Quiet

Thesh wrote:http://www.wolfeaviation.com/aircraft_quiet_flight.html


I knew it!
by p1t1o
Wed Nov 30, 2016 3:24 pm UTC
Forum: Science
Topic: How to Make a Blender Quiet
Replies: 27
Views: 2236

Re: How to Make a Blender Quiet

I have heard anecdotally that in airliners they sometime pipe in through speakers the inverse of whatever cabin noise is present, reducing percieved engine noise, analogous to the effect used in noise cancelling headphones I think. Is such a thing viable? On another note - I think the best way to is...
by p1t1o
Fri Nov 25, 2016 2:47 pm UTC
Forum: Science
Topic: Does eating food measurably affect body temperature?
Replies: 7
Views: 1363

Re: Does eating food measurably affect body temperature?

Of course there are many science experiments that you can do with kids, but clinical trials are a specific kind of experiment. Obviously its quite hard to simulate with schoolkids, but food is as good an approach as any. There are many things you could measure - you could even ask them to fill in a ...
by p1t1o
Thu Nov 24, 2016 10:43 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 76
Views: 6606

Re: Terminal Velocity of Quasimodo

mcdlibrary wrote:Also, would he survive the fall?


This depends mainly on his mass and how much rocket fuel he carries.
by p1t1o
Thu Nov 17, 2016 4:15 pm UTC
Forum: Science
Topic: Toroidal star
Replies: 14
Views: 1545

Toroidal star

So, could this be possible? Obviously very improbable, but is there anything other than very specific starting conditions (involving lots and lots of angular momentum), that would prevent this? Background: I just saw an article about "the most spherical object ever observed in nature" whic...
by p1t1o
Thu Nov 10, 2016 8:52 am UTC
Forum: Science
Topic: Inventing The Intelligence
Replies: 5
Views: 1378

Re: Inventing The Intelligence

They say you can summon him by chanting his name and jumping up and down 3 times in front of your computer monitor. Just make sure that when you jump, that you reverse your trajectory and land softly where you started. *** So whats the deal? You built an AI in your shed? Mathematical proof that gene...
by p1t1o
Wed Oct 26, 2016 7:52 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

Honestly, I'd just stick with the most populous. A great deal of the worlds problems boil down to population pressure.
by p1t1o
Fri Oct 21, 2016 6:52 pm UTC
Forum: Science
Topic: Has any other species ever rendered another extinct?
Replies: 5
Views: 1331

Has any other species ever rendered another extinct?

To clarify: We all know the cycle: 1 animal evolves to be a bit faster by escaping predators, a predator which feeds on it evolves ambush tactics, the prey animal evolves horns etc... Has there ever been examples where one species evolved a trait which another species failed to counter, and was then...
by p1t1o
Thu Oct 20, 2016 9:15 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 76
Views: 6606

Re: Science fleeting thoughts

by p1t1o
Mon Oct 17, 2016 4:53 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

I think I have been pretty clear all along that I'm taking issue with words like "sterilizing". I have no doubt the consequences would be horrific, and that our species would quite possibly go completely extinct as a result, but there is a fairly large gap between "uninhabitable by h...
by p1t1o
Mon Oct 17, 2016 4:22 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

Even when an entire population is within the 8psi overpressure radius, NUKEMAP suggests many will survive and some won't even be injured badly . (Obviously the exact geography of an area will have an effect, I'm just using islands to focus on the casualty rate within small distances of one explosio...
by p1t1o
Mon Oct 17, 2016 12:28 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

gmalivuk wrote:snip


Land strikes it is then!

All this just goes to show...dang, planets are BIG hey?
by p1t1o
Mon Oct 17, 2016 9:16 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

Sure, smaller warheads every couple square miles would be worse, but I was talking about your original scenario as described. Also, looking at it more carefully your initial numbers started off wrong by a factor of 4. There are about 200 million square miles of land area. If you cut that in half (f...
by p1t1o
Fri Oct 14, 2016 1:45 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

Edit: I strongly doubt you would even kill all humans with the distributed 1mt bombs mentioned above, let alone all life. Yes, most buildings would collapse and people in the open would be badly burned, but people in basements and behind reinforced walls would probably survive. A proportion will su...
by p1t1o
Fri Oct 14, 2016 12:26 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

Or one Spock. Potential for a nice new unit of energy, 1 Spock (Sk) = 4300megatons, or 1.8e19J And what would you do, personally, to destroy the earth with the above? I think the most destructive use of 10kg of antimatter, would be to use it to create a large collection of antimatter-catalysed fusi...
by p1t1o
Fri Oct 14, 2016 8:32 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: Science-based what-if questions

Well, the vacuumed-hole approach might make for a nice Roman candle kind of display. Ooh, some random knowledge in my head just tickled! During underground testing of nuclear weapons, it was found that boreholes carrying sensors would be sealed by the shockwave, reducing fallout. So it looks like a...
by p1t1o
Wed Oct 12, 2016 9:34 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 76
Views: 6606

Re: Science fleeting thoughts

Re: drugs in water - the key is persistance and bio-accumulation. Some work has been done on the environmental impacts of common medications too, such as birth control pills which have shown measured impacts on marine life downstream from big cities. The idea that a pandemic situation would cause so...
by p1t1o
Mon Oct 03, 2016 3:51 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 76
Views: 6606

Re: Science fleeting thoughts

Isn't this what tidal power does? Yes I think so. Just did a back-of-the-napkin calculation: If we lower the moon from its present height, to one 25% lower, we can liberate over 7e18TJ. With the global average consumption (as of 2009) at around 15TW, this energy could last us around 15 billion year...
by p1t1o
Mon Oct 03, 2016 2:37 pm UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 76
Views: 6606

Re: Science fleeting thoughts

Just crash a few asteroids into it at the appropriate speed and direction every once in a while to speed it back up again.. Im just wondering if there might be enough kinetic energy stored in it that we might *never need to*, either the sun will eat it first or humanity will fade away. Or move away.
by p1t1o
Mon Oct 03, 2016 8:16 am UTC
Forum: Science
Topic: Science fleeting thoughts
Replies: 76
Views: 6606

Re: Science fleeting thoughts

On the topic of moving mass down a potential gradient for energy generation... If we could hypothetically extract kinetic energy from the moon, symmetrically lowering its orbit... and of course, converting this energy into electricity at 100% efficiency... How many years of electricity could be supp...
by p1t1o
Wed Sep 28, 2016 10:11 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 9974

Re: what would happen if we squeezed 4000 people into the volume of 1

Since people are mostly water, and water is mostly incompressible, I'm not sure what would happen when you try to compress water by a factor of 4000. Would degenerate matter form? I think at lower pressures some exotic forms of ice would appear, but I don't think any of those ice types are 4000 tim...
by p1t1o
Fri Aug 19, 2016 12:42 pm UTC
Forum: Science
Topic: Future War?
Replies: 8
Views: 1443

Re: Future War?

To have any kind of meaningful answer to this question, you really need to narrow down "future" a little bit! Do you mean next decade? Next century? Next millenia? The answer could be dramatically different in each case! My two pence would be - the makeup of "future" warfare prob...
by p1t1o
Mon Aug 08, 2016 4:16 pm UTC
Forum: Science
Topic: What is the Biggest Non-Repeating Molecule?
Replies: 39
Views: 3384

Re: What is the Biggest Non-Repeating Molecule?

Well anything with a repeating carbon backbone is out, anything crystalline is out, I think the answer is going to be a surprisingly small molecule.
by p1t1o
Wed Jul 27, 2016 3:06 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 4162

Re: Is the Hyperloop remotely possible?

15 psi will kill just about anybody, though, so I don't get your point. My point in that regard is that whilst it is very difficult to reinforce a building to withstand 15psi, to do so with a train car should be trivial. Dynamic pressure at Mach 1 is about 8-9psi, and since pilots have survived eje...
by p1t1o
Wed Jul 27, 2016 1:31 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 4162

Re: Is the Hyperloop remotely possible?

Current train transport is extremely safe. You can't just compare raw accident rates, you have to look at deaths. When airplanes have accidents, there are very often fatalities, but when trains have accidents, hardly anybody ever dies. When the Hyperloop has an accident, a ton of people are likely ...
by p1t1o
Wed Jul 27, 2016 11:03 am UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 4162

Re: Is the Hyperloop remotely possible?

A large failure in an aeroplane cabin means loss of oxygen. That can be solved with additional oxygen from those face masks. You prefer this doesn't happen but if it does there is a solution. The pressure drop itself is not dangerous except perhaps for your eardrums, if the Eustachian tube is block...
by p1t1o
Wed Jul 27, 2016 8:56 am UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 4162

Re: Is the Hyperloop remotely possible?

Well no, even if a plane's engines fail, even if there is depressurization, even if lots of things go wrong, you will probably survive. You need pretty much all the engines to fail in order for the crash to go badly, and even then depending on a lot of factors you might be OK. And yet air disasters...
by p1t1o
Tue Jul 26, 2016 1:08 pm UTC
Forum: Science
Topic: Is the Hyperloop remotely possible?
Replies: 62
Views: 4162

Re: Is the Hyperloop remotely possible?

Strikes me as a ridiculous idea for our level, train travel is already expensive enough. It also strikes me though, that none of the safety issues are any different/more severe than those faced by airline passengers. Aircraft are susceptible to terrorism/weaponry just as much and Im willing to bet t...
by p1t1o
Mon Jul 18, 2016 8:59 am UTC
Forum: Science
Topic: How do satellites not crash into each other?
Replies: 94
Views: 8819

Re: How do satellites not crash into each other?

With solar power stations in GSO, the transmission beam is going to sweep a lot of near Earth space. Possibility it might be more practical to have them in LEO to minimise this volume?
by p1t1o
Wed Jul 13, 2016 3:34 pm UTC
Forum: Science
Topic: How do satellites not crash into each other?
Replies: 94
Views: 8819

Re: How do satellites not crash into each other?

Correct me if I am wrong, but why would GSO be a shell? I'd expect more of a donut shape with a primary diameter of 42,164 km and a secondary diameter of 1km. This results in a torus volume of 8.3*10 14 m 3 . You'd need only a tiny slice of LEO to make that volume. V = 2 pi 2 a 2 c (assuming ra...
by p1t1o
Wed Jul 13, 2016 12:12 pm UTC
Forum: Science
Topic: How do satellites not crash into each other?
Replies: 94
Views: 8819

Re: How do satellites not crash into each other?

Just for reference, I banged out a few volume calculations: Volume of a 1km thick shell at GSO = ~2.30e19m^3 Volume of 200-1000km LEO shell = ~4.89e20m^3 Volume of 200-300km LEO shell = ~1.70e20m^3 Volume of 200-250km LEO shell = ~2.373e19m^3 Volume of 200-240km LEO shell = ~2.18e19m^3 So as a gener...
by p1t1o
Wed Jul 13, 2016 8:41 am UTC
Forum: Science
Topic: Dropping a Cloud Nine From Orbit
Replies: 38
Views: 4304

Re: Dropping a Cloud Nine From Orbit

Rather than trying to heat it up to increase buoyancy what about reducing the oxygen content and increasing the nitrogen content to use it as a lifting gas? Sea level oxygen is about 21% of air but at higher altitudes which we can condition for it's only 12% or so. It's unclear to what would be mor...
by p1t1o
Tue Jul 12, 2016 9:56 am UTC
Forum: Science
Topic: How do satellites not crash into each other?
Replies: 94
Views: 8819

Re: How do satellites not crash into each other?

Maybe we should stop putting so much damn paint on our spacecraft...
by p1t1o
Sat Jun 11, 2016 4:32 am UTC
Forum: Science
Topic: Stable Orbits inside a black hole?
Replies: 5
Views: 1712

Re: Stable Orbits inside a black hole?

Thanks guys, that has clear things up a lot :)
by p1t1o
Fri Jun 10, 2016 9:30 pm UTC
Forum: Science
Topic: Stable Orbits inside a black hole?
Replies: 5
Views: 1712

Re: Stable Orbits inside a black hole?

Charged and rotating black holes have inner and outer horizons. Within the inner horizon everything falls, but between them particles whose charge repels them from the black hole or whose motion is in the same direction as the black hole's rotation can still escape. If there are stable orbits withi...
by p1t1o
Fri Jun 10, 2016 6:12 pm UTC
Forum: Science
Topic: Stable Orbits inside a black hole?
Replies: 5
Views: 1712

Stable Orbits inside a black hole?

So someone pointed me towards this paper: http://arxiv.org/pdf/1103.6140v4.pdf In the abstract it refers to stable orbits "within" rotating or charged black holes. I was of the impression that ALL movement, all paths, all timelines within a BH terminate at the singularity, that "hitti...
by p1t1o
Wed Jun 08, 2016 3:54 pm UTC
Forum: Science
Topic: Alkaline Food
Replies: 26
Views: 4373

Re: Alkaline Food

For getting a more alkaline diet, this book lists foods such as banana, celery, lettuce, mung bean sprouts, and spring onion. There is a huge amount of snake oil and quackery out there surrounding "alkaline diets". Many of them will even tell you that lemons and limes are alkaline! (Big L...
by p1t1o
Wed Jun 01, 2016 1:07 pm UTC
Forum: Science
Topic: Expected oldest person in history
Replies: 33
Views: 4903

Re: Expected oldest person in history

I imagine that many of them believe they remember things that happened before they were born, because they'd heard them talked about enough to feel like they were present, and didn't have the recordkeeping available to correct themselves. Hasn't anyone ever done that? "Oh me yarm yeah that was...
by p1t1o
Wed May 11, 2016 8:30 am UTC
Forum: Science
Topic: Alkaline Food
Replies: 26
Views: 4373

Re: Alkaline Food

Is evolution trolling us?

"Lets make all acidic food super tasty, and make almost no food alkaline. But hey! Lets make teeth basic!"
by p1t1o
Tue May 10, 2016 3:19 pm UTC
Forum: Science
Topic: Alkaline Food
Replies: 26
Views: 4373

Re: Alkaline Food

Also, I believe that taking tums over long periods of time habitualizes your system to producing more acids. This is true, at least for calcium salts. For longer term problems a "proton pump inhibitor" (like "Zantac") works well and are available without prescription, I have the...

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