Search found 747 matches

by p1t1o
Tue Nov 14, 2017 11:25 am UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

To clarify something in my head - Lets for the moment ignore gravitational radiation. Theres 2 stars, lets call them 1 solar mass each. Orbiting each other in a binary pair at some average binary pair distance that is <<1 light year. I am some long distance away, lets say 1 light year. The gravity f...
by p1t1o
Mon Nov 13, 2017 4:07 pm UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

Gravity waves need *energy*. That can't, obviously, come from a constantly moving object. Well two neutron stars orbiting each other have no means of slowing down and spiralling-in, other than they lose energy via gravity wave radiation, so do then ALL rotating masses lose energy in this way (just ...
by p1t1o
Mon Nov 13, 2017 3:32 pm UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

I suppose a rotating mass can be considered an accelerating one, or one in any oscillating motion.
by p1t1o
Mon Nov 13, 2017 2:39 pm UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

The 'waves' are from the gravity one feels, outwith the event horizon. They are waves because the mass (the two masses) is(/are) moving through space to oscillate the effect of the combined gravitational gradient for the observer. And you might say that gravity itself must 'escape' the event horizo...
by p1t1o
Mon Nov 13, 2017 9:06 am UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

Now this made me question this: What happen if a gravitational wave is strong enough for the space to vibrate... about 10m or more? (Assuming only gravitational wave effect) Im going to go out on a limb and say I think this might fall into "We have no idea" territory. Extrapolating nano-s...
by p1t1o
Fri Nov 10, 2017 3:12 pm UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

Not directly relevant but super-interesting:

W.R.T merger event GW150914:

"Despite the tremendous energy emission, the effects of the gravitational waves on a human located only one AU from the merger event would have been minor and survivable."
by p1t1o
Fri Nov 10, 2017 2:10 pm UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

The energy released by the binary as it spiralled together and merged was immense, with the energy of 3.0+0.5 −0.5 c2 solar masses (5.3+0.9 −0.8×1047 joules or 5300+900 −800 foes) in total radiated as gravitational waves See what you mean, true, true. Even though the energy radiated still has mass,...
by p1t1o
Fri Nov 10, 2017 12:27 pm UTC
Forum: Science
Topic: Speed of gravity.
Replies: 32
Views: 1264

Re: Speed of gravity.

speising wrote: but sometimes they vanish.


They do? How?
by p1t1o
Thu Nov 09, 2017 11:32 am UTC
Forum: Science
Topic: Bathing in Vinegar
Replies: 16
Views: 711

Re: Bathing in Vinegar

Honestly, in my professional opinion, I think the first thing you will notice is the smell, followed by the vapour stinging your eyes, followed by precise knowledge of the position of any tiny break in your skin, followed by your butthole itching really badly. Vinegar wont do much to unbroken skin, ...
by p1t1o
Wed Nov 08, 2017 4:23 pm UTC
Forum: Science
Topic: Bathing in Vinegar
Replies: 16
Views: 711

Re: Bathing in Vinegar

You have to define it better, "vinegar" is a dilute solution already, of acetic acid. Neat acetic acid will cause burns and probably destroy your eyes. Even the vapours can cause eye burns. Its also quite flammable. Various dilutions of it will cause less severe burns down to skin irritati...
by p1t1o
Mon Nov 06, 2017 2:43 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Penetrate Earth

So, I have asked for a Matter-Antimatter Anti-Structure Sniper Rifle earlier in this thread. Now, I wanted to test this, and to do that, I need a target, a huuuuge target. So, I decided to aim it down, lock and loaded, and it's time to penetrate Earth. Supposed I aimed it straight down, and used th...
by p1t1o
Thu Nov 02, 2017 4:22 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2853
Views: 561856

Re: Miscellaneous Science Questions

I've noticed this. I thought it was fairly obvious that as the teaspoon cools, its resonant frequency changes due to minute changes in size and flexibility as it contracts. A shorter, stiffer spoon rings at a higher frequency. I presume the effect described in point #5 is subjective and would be eli...
by p1t1o
Wed Nov 01, 2017 4:53 pm UTC
Forum: Science
Topic: Really Lucky's statistic
Replies: 13
Views: 704

Re: Really Lucky's statistic

This is one of those discussions where you need a really rigorous definition of "blessed".

To me, blessed and lucky mean the exact same thing.
by p1t1o
Wed Nov 01, 2017 2:11 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

That's not the first time I've heard people talk about the cost of a blade or bit or whatever, and I never understood it. The raw material cost of that quantity of diamond and copper is negligible compared to the cost of the tool. What is actually so expensive? I think its to do with the quality of...
by p1t1o
Tue Oct 31, 2017 12:01 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

FunFact - apparently obsidian blades are sometimes still used in eye surgery due to their extreme sharpness. FunFact #2 - In the same course I also used transmission electron microscopy - this is the one where you look at very thin slices of a subject. To make the slices we used a diamond knife. Thi...
by p1t1o
Mon Oct 30, 2017 3:05 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

Should a razor blade be "very sharp"? I want it to be sharp enough to easily cut hair, but blunt enough that I don't constantly cut myself. Well given that hair is tougher than skin, thats a tall ask. Yes, I think I will go out on a limb and say razor blades are supposed to be, and practi...
by p1t1o
Mon Oct 30, 2017 1:58 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

Yeah, it would probably be easier to follow (and more scientific) if the question had just been, "What would happen if we somehow broke all the molecular bonds in an apple?" instead of bringing a magical sword into the mix. (Sure, the mechanism by which the bonds are broken is still handw...
by p1t1o
Fri Oct 27, 2017 3:28 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

This discussion is....hard. Too much fiction mixed in with science.
by p1t1o
Wed Oct 25, 2017 2:48 pm UTC
Forum: Science
Topic: Why do they ship with dry ice instead of salted ice?
Replies: 29
Views: 1201

Re: Why do they ship with dry ice instead of salted ice?

Its actually not classified as hazardous, in the EU or the US, only the IATA (International Air Transport Authority) classifies it as hazardous, but since air travel has unique risks, they often take a more "hard line" on various things. Eg: they have much lower criteria for "flammabl...
by p1t1o
Mon Oct 23, 2017 8:04 am UTC
Forum: Science
Topic: Lightning in a bottle
Replies: 5
Views: 506

Re: Lightning in a bottle

Arent you basically describing a discharge light bulb, eg: a "neon light" ?

Lightning is not a reaction per se. Although chemical reactions may take place due to the high energy load, they are not necessary for "lightning".
by p1t1o
Mon Oct 23, 2017 7:53 am UTC
Forum: Science
Topic: What are 10 future out of the box technologies/inventions
Replies: 3
Views: 437

Re: What are 10 future out of the box technologies/inventions

Take your pick out of all the sci-fi books. Head up display on a contact lens. Technological memory enhancement. Drug that instantly and completely removes all effects of alcohol. Mobile phone in a tooth. Spray on skin (wound treatment) Artificial blood. Grow-your-own organs. Massively distributed s...
by p1t1o
Wed Oct 18, 2017 10:56 am UTC
Forum: Science
Topic: A whimsical thought about Neutron Stars...and Quark Stars
Replies: 12
Views: 3198

Re: A whimsical thought about Neutron Stars...and Quark Stars

IIRC you dont get to neutronium until you get underneath the layer of iron which covers the surface. When compressing matter, iron is what you get just before you get neutronium. Its the bottom of the fusion ladder. "Excavating" (ignoring all of the imaginary super-technology required) you...
by p1t1o
Fri Sep 22, 2017 11:54 am UTC
Forum: Science
Topic: EXPERIENCE TRUE LEVEL!
Replies: 21
Views: 2361

Re: EXPERIENCE TRUE LEVEL!

See? There's tons of stuff to find out!

Like, what kind of noise would it make? Complete silence? Or a muted scream of a small patch of matter being deformed at huge pressures?

And if we could make an atomically-perfect "marble-run", just think of the buckets of science we could make!
by p1t1o
Thu Sep 21, 2017 10:54 am UTC
Forum: Science
Topic: EXPERIENCE TRUE LEVEL!
Replies: 21
Views: 2361

Re: EXPERIENCE TRUE LEVEL!

Apparently the new kilogram standard is a perfect sphere correct to 3 Angstroms, which, depending on the atom/bonding, is approx 1-3 atoms/bonds. https://www.newscientist.com/article/dn14229-roundest-objects-in-the-world-created/ That's just one proposed standard. The 2018 redefinition is likely to...
by p1t1o
Thu Sep 21, 2017 10:28 am UTC
Forum: Science
Topic: EXPERIENCE TRUE LEVEL!
Replies: 21
Views: 2361

Re: EXPERIENCE TRUE LEVEL!

Apparently the new kilogram standard is a perfect sphere correct to 3 Angstroms, which, depending on the atom/bonding, is approx 1-3 atoms/bonds.

https://www.newscientist.com/article/dn ... d-created/
by p1t1o
Wed Sep 20, 2017 2:00 pm UTC
Forum: Science
Topic: EXPERIENCE TRUE LEVEL!
Replies: 21
Views: 2361

Re: EXPERIENCE TRUE LEVEL!

Oh I have a fun fact about flatness!

If you shrank down the Earth to the size of a squashball, the Earth would be smoother than an actual squashball.

And the converse:

If you blew up a squashball to the size of the Earth, the mountains and valleys would be far deeper and taller than ours.
by p1t1o
Wed Sep 20, 2017 12:06 pm UTC
Forum: Science
Topic: EXPERIENCE TRUE LEVEL!
Replies: 21
Views: 2361

Re: EXPERIENCE TRUE LEVEL!

Something something sputter deposition something something, I think.
by p1t1o
Wed Sep 20, 2017 9:52 am UTC
Forum: Science
Topic: Popping a Balloon
Replies: 2
Views: 592

Re: Popping a Balloon

I have heard that the term for the physical process of the failure mode of a popping balloon (a bursting polymer) is "catastrophic unzipping".

If accurate, its one of my favorite science terms. Even better than "spaghettification".
by p1t1o
Wed Sep 20, 2017 8:11 am UTC
Forum: Science
Topic: EXPERIENCE TRUE LEVEL!
Replies: 21
Views: 2361

Re: EXPERIENCE TRUE LEVEL!

Yes we can.

And it would feel pretty normal.

Except for the mind altering, reality bending, hypnogogic euphoria, of course.
by p1t1o
Fri Sep 15, 2017 11:57 am UTC
Forum: Science
Topic: Stupid Science Q&A
Replies: 34
Views: 2105

Re: Stupid Science Q&A

Without looking it up, I suspect there's at least something like "face-centred/body-centred cubic crystals, in the differences, albeit locally across an amorphous whole, of course. (Hitting my limit of precise knowledge, so inexpertly importing from other fields. Exactly to demonstrate the poi...
by p1t1o
Fri Sep 15, 2017 10:31 am UTC
Forum: Science
Topic: Stupid Science Q&A
Replies: 34
Views: 2105

Re: Stupid Science Q&A

Imagine a chemist who gave answers like that! I think that answering as a list would be acceptable in an informal setting. If I asked a friend what limestone was made out of, the most useful reply he could give would be something along the lines of, 'It is calcium, carbon, and oxygen, with some imp...
by p1t1o
Thu Sep 14, 2017 3:07 pm UTC
Forum: Science
Topic: Stupid Science Q&A
Replies: 34
Views: 2105

Re: Stupid Science Q&A

jewish_scientist wrote:
p1t1o wrote:Anyway, oxygen, hydrogen or vacuum are silly answers in either case.

I just realized, 2 of those answers are correct. Water vapor is made of oxygen and hydrogen. They (hopefully) did not mean O2 and H2.


That would be just as bad! Possibly worse!

Imagine a chemist who gave answers like that!
by p1t1o
Mon Sep 11, 2017 1:58 pm UTC
Forum: Science
Topic: Stupid Science Q&A
Replies: 34
Views: 2105

Re: Stupid Science Q&A

Pfft. This is nothing. A striking proportion (I forget what the percentage was that was quoted to me) of chemistry graduates cant correctly identify what is inside the bubbles in boiling water. I learned of this just after graduating myself and tested it by asking some fellow graduates, and it held...
by p1t1o
Mon Sep 11, 2017 9:53 am UTC
Forum: Science
Topic: Stupid Science Q&A
Replies: 34
Views: 2105

Re: Stupid Science Q&A

Pfft. This is nothing. A striking proportion (I forget what the percentage was that was quoted to me) of chemistry graduates cant correctly identify what is inside the bubbles in boiling water. I learned of this just after graduating myself and tested it by asking some fellow graduates, and it held ...
by p1t1o
Mon Sep 04, 2017 10:36 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

Well, I said inside, but I think it would be better anyway to just create it as the border of the sun (Maybe inside it abit for faster process). The opacity of the Sun is a problem though, but let said I used extreme Gamma ray's array as it. Also, black hole last for waaaay longer than you think, e...
by p1t1o
Mon Sep 04, 2017 8:01 am UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 413
Views: 36475

Re: Science-based what-if questions

Well, I said inside, but I think it would be better anyway to just create it as the border of the sun (Maybe inside it abit for faster process). The opacity of the Sun is a problem though, but let said I used extreme Gamma ray's array as it. Also, black hole last for waaaay longer than you think, e...
by p1t1o
Fri Aug 25, 2017 1:33 pm UTC
Forum: Science
Topic: American solar eclipse
Replies: 44
Views: 2911

Re: American solar eclipse

Unrelated to the above: I just watched a video from a flatearther on youtube about how the eclipse proves that the round-earth heliocentric model is fake. The main arguments seemed to be that one person filming it said that it was happening an hour earlier than they'd expected (I suspect they eithe...
by p1t1o
Wed Aug 23, 2017 10:21 am UTC
Forum: Science
Topic: the central pier of the west span of the bay bridge
Replies: 30
Views: 1469

Re: the central pier of the west span of the bay bridge

A lot of the arguments/counter arguments being mentioned assume that the bridge is constantly in a state of steady equilibrium. It is true that a suspension bridge can be made arbitrarily long without increasing the tension in the cables. But this is only true in a steady-state. Consider a 4-tower b...
by p1t1o
Tue Aug 22, 2017 3:31 pm UTC
Forum: Science
Topic: the central pier of the west span of the bay bridge
Replies: 30
Views: 1469

Re: the central pier of the west span of the bay bridge

That still doesn't help explain, in my mind. (@p1t1o, this is!) They avoided a single span by having three (and two halves) spans*. Then additionally supported the middle one anyway . For reasons the OP, and now me, cannot fathom. As far as I am understanding it - Its not a "support", its...
by p1t1o
Tue Aug 22, 2017 1:51 pm UTC
Forum: Science
Topic: the central pier of the west span of the bay bridge
Replies: 30
Views: 1469

Re: the central pier of the west span of the bay bridge

Yeah it does say the design for the single bridge was too low in the centre. But it also said that the single bridge design would have required too much space at the San Francisco side, and "too much fill" - I take this to mean that it would have required a lot more excavation, as it was a...

Go to advanced search