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Saturday, February 10, 2018

Why can't we simulate gravity?

Why can't we simulate gravity?

Why can't we simulate gravity?

Posted: 09 Feb 2018 08:29 AM PST

So, I'm aware that NASA uses it's so-called "weightless wonders" aircraft (among other things) to train astronauts in near-zero gravity for the purposes of space travel, but can someone give me a (hopefully) layman-understandable explanation of why the artificial gravity found in almost all sci-fi is or is not possible, or information on research into it?

submitted by /u/unlikely_baptist
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When the brain receives a nerve signal from the skin, how does it differentiate between a heat signal, a cold signal, a pain signal, a pressure signal etc?

Posted: 10 Feb 2018 03:54 AM PST

Is it "code-based", like different levels/durations of charge?

Is it "structure-based", like the pain-detecting nerves are connected to a pain-detecting piece of brain?

Or something else entirely?

submitted by /u/shit_post_life
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Since friction originates from electromagentic force, does that mean that neutrons, Which are neutral to each other, can overlap?

Posted: 10 Feb 2018 03:05 AM PST

Overlap = exist in the same spot in case it isn't clear.

This question can be taken a step further, since the force that keeps protons together should be stronger than the force that repels them (otherwise there are no atoms). Would that mean that protons in an atom should be compressing into a single point so that the nucleus has the volume of a single proton?

submitted by /u/guyuz
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What is the best way to plot the geometry of multiple intersecting magnetic and diamagnetic fields?

Posted: 09 Feb 2018 08:24 AM PST

Example of some practical questions to tackle are those presented in these demonstrations:

https://www.youtube.com/watch?v=sENgdSF8ppA

Essentially how could you plot the path that electrons are taking when a magnets interact with eachother or when they interact with a diamagnetic.

Georgia State University hosts a basic example of magnetic fields which likely we have all seen before: http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magforcon.html

But how do we mathematically plot and predict how a magnetic field will behave when subjected to multiple sources in various amounts of Tesla units and their interactions with diamagnetic material?

Thanks Science!

submitted by /u/Fox_Tango
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Why are alpha particles invariably emitted from unstable nucli rather than individual proton or deuteron or 3He ?

Posted: 10 Feb 2018 01:54 AM PST

i know about the binding energy term and stability of alpha particle in comparable with the proton, 3He,deuteron.

submitted by /u/Shehab3055
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Why does planet's mass affect it's speed around sun?

Posted: 10 Feb 2018 06:08 AM PST

Let's assume that planet orbits sun perfectly circular. If force by which sun pulls planet is GMm/r2, and F=ma than a = GM/r2. Now we also know that for circular motion: a = V2 / r , which means that V = sqrt(r * GM/r2) So from this equations it seems that mass of the planet shouldn't matter at all. But I know that mass of the planet does matter if it's quite large, how? why? I mean are this laws incorrect? or do I miss something?

submitted by /u/cannabis_Grower
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What speeds do particles in the center of an atomic blast achieve?

Posted: 09 Feb 2018 05:13 PM PST

How do they compare to the velocities of particles in an experiment at the LHC?

submitted by /u/throwmeawaygoddam
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Has there been any proof to a preons existence? And exactly what is it?

Posted: 10 Feb 2018 03:51 AM PST

How are we sure how many protons/neutron an atom has?

Posted: 09 Feb 2018 12:03 PM PST

What is the center of mass for a ring? For example, if we built a massive ring world, without any artificial gravity, where would gravity take us?

Posted: 09 Feb 2018 04:46 PM PST

What is 0 divided by 0?

Posted: 09 Feb 2018 07:45 PM PST

I know that that a number divided by zero is undefined, but also a number divided by itself is also supposed to be 1. There is another way to look at it as well; what number times 0 will equal 0 which is every possible number. So which is it? I felt this was a better place to post than theydidthemath or estimation, let me know if I should ask over there as well.

submitted by /u/callmemateo
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Does the Milky Way Galaxy orbit around anything?

Posted: 09 Feb 2018 01:24 PM PST

Ok, so the fact that the earth orbits the sun is trivial enough. Then the sun orbits around the center of the milky way (side note, I would love for more information about this if anyone has it available). But, does the Milky Way itself rotate around some even larger object? And if so, is there a consensus, or at least theories, on how far it goes in this manner? Thanks in advance!

submitted by /u/RyanBrawny
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Orbital mechanics question: can you burn for a direct capture of mars orbit as you leave earth orbit?

Posted: 09 Feb 2018 01:22 PM PST

A friend and I got into a discussion about this. He says its impossible to do without a significant retro burn. I say it's just requires a lot of precision and is impractical but possible. What say you?

submitted by /u/jebediah999
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What happens when the sound barrier is broken at or around absolute zero?

Posted: 09 Feb 2018 11:06 AM PST

Basically, I just want to know if it is any different from breaking the sound barrier at normal conditions. Has this been done? I have read that it is easier to break the sound barrier at lower temperatures and lower pressures.

submitted by /u/MadZack
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If you push a heavy object in space, would you both be pushed at an equal distance or would you be pushed further?

Posted: 09 Feb 2018 08:13 PM PST

What are the hypothetical properties of gravitons, and what are their implication?

Posted: 09 Feb 2018 03:57 PM PST

I've heard from some various sources (not sure about their validity though) that certain energies and forces have an complementary particle (I.e. photons and light waves), and heard that the complementary particles to gravity are called gravitons. what hypothetical properties would these have, and what would that implicate according to those properties (I.e. for future research)?

(Sorry I'm on the app and it was bugging so I deleted my initial post, I am re-uploading it now)

submitted by /u/lithium_gold
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Is fusion actually happening inside of fusion test reactors?

Posted: 09 Feb 2018 01:37 PM PST

I've seen lots of headlines about working fusion reactors, but they all seem to beat around the bush in stating whether or not fusion is actually happening; the most press sites are willing to state is that generating "first plasma" was successful.

Is fusion going on inside of the reactors? How can we tell? Has fusion ever been successfully observed on earth?

submitted by /u/overtheridge
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Why can't we simply melt uranium metal to separate out the U-235? (Enrich it)

Posted: 09 Feb 2018 01:50 PM PST

We currently use things like a centrifuge to separate out the enriched U-235 from the U-238, because the U-235 isotope is slightly lighter.

As I understand it, the 2 isotopes are chemically identical, so the only way to separate them is by their (very)slightly weight difference.

Why can't we just melt a bunch of uranium and then let it settle in it's liquid form and scrape the U-235 "cream" off the top?

submitted by /u/Omniwing
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What languages are the most efficient and inefficient ones?

Posted: 09 Feb 2018 09:56 AM PST

In other words: what languages has, on average, the longest sentences?

submitted by /u/datttPenGUiN
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How do stars die?

Posted: 09 Feb 2018 03:51 PM PST

How are lab rats given cancer?

Posted: 09 Feb 2018 01:24 PM PST

How did the scientists who made the cancer vaccine get the mice to have cancer?

Posted: 09 Feb 2018 07:15 PM PST

How worried should we be about melting permafrost releasing mercury?

Posted: 09 Feb 2018 10:54 AM PST
vào lúc No comments:

Friday, February 9, 2018

When octopus/squid/cuttlefish are out of the water in some videos, are they in pain from the air? Or does their skin keep them safe for a prolonged time? Is it closer to amphibian skin than fish skin?

When octopus/squid/cuttlefish are out of the water in some videos, are they in pain from the air? Or does their skin keep them safe for a prolonged time? Is it closer to amphibian skin than fish skin?

When octopus/squid/cuttlefish are out of the water in some videos, are they in pain from the air? Or does their skin keep them safe for a prolonged time? Is it closer to amphibian skin than fish skin?

Posted: 08 Feb 2018 08:40 AM PST

Does the size of electromagnetic waves in the visible light spectrum make it impossible to focus a conventional microscope on things close to or smaller than the wave's magnitude?

Posted: 08 Feb 2018 10:50 PM PST

Sorry for the odd phrasing but I dont know a more succint way of putting it.

submitted by /u/fireflambe
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Can anyone tell me why was uranium so light Dimitri Mendeleev periodic table?

Posted: 09 Feb 2018 01:36 AM PST

I was reading this article. The article stated that the atomic weight of uranium in Dimitri's periodic table is about half of what we know. I was wondering why?

submitted by /u/xxOskanxx
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Other than radiation, fusion, and fission, are there any natural processes which alter atoms from one element to another? [Chemistry]

Posted: 08 Feb 2018 10:58 PM PST

Does a binary star system have interacting Goldilocks zones?

Posted: 08 Feb 2018 04:23 PM PST

Do binary stars have individual planet systems, or do the two share one? Would a binary star system have any advantages or disadvantages in terms of potential life formation in the "Goldilocks" zone?

submitted by /u/JOHANSENATOR
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Is USB charging more battery friendly than charging with AC charger?

Posted: 09 Feb 2018 06:12 AM PST

I've seen it mentioned a couple of times here and there, that when you charge your device with a USB cable (connected to your computer), the battery will get less hot than when you charge it with an AC charger, which affects the battery life. Is that true and doesn't that mean that fast chargers are actually bad for your battery on the long run?

submitted by /u/igai_
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Considering surface tension, how do <1 cm insects consume water safely?

Posted: 08 Feb 2018 09:28 AM PST

Did dinosaurs shed their skin like modern reptiles?

Posted: 09 Feb 2018 01:39 AM PST

How exactly does fluticasone nasal spray work?

Posted: 08 Feb 2018 09:14 PM PST

The stuff immediately makes my allergy symptoms go away. I know it's a corticosteroid but I can't find an actual breakdown of what it's doing once inhaled.

submitted by /u/raychullzz
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If hair is made out of keratin (protein), why does heat-curled hair go back to normal after you wash it? What is it about the water that helps hair go back to normal, and why is the protein in hair not permanently denatured?

Posted: 08 Feb 2018 04:36 PM PST

How is a rocket able to lift itself off the Earth and escape gravity if total energy is conserved?

Posted: 09 Feb 2018 06:52 AM PST

Why is elastin elastic?

Posted: 08 Feb 2018 10:43 PM PST

Why does the falcon 9 heaven rocket have a mist coming over it at launch?

Posted: 09 Feb 2018 12:44 AM PST

If you dig straight down, do the rocks age with depth?

Posted: 08 Feb 2018 04:30 PM PST

Say if you have a vast mineshaft. Are the rocks at the very bottom as old as the Earth itself? Do the rocks become younger as your tunnel upwards?

submitted by /u/NippPop
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Are there clues in the geologic record as to when chunks of subducted tectonic plates have snapped relatively clean from the parent plate?

Posted: 08 Feb 2018 08:01 PM PST

Like large crustal upheavals, rebounds, something like the Great Unconformity being representative of this type of event? I'm wondering what magnitude of earthquake could occur in a region where a few hundred miles of a tectonic plate might have broken off in successive events that caused widespread "really big ones" generated from far deeper than those relatively close to the surface.

submitted by /u/screwyoutoo
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Why does your nose get runny when you’re outside in the cold for a long time?

Posted: 08 Feb 2018 10:27 AM PST

How does the development of two umbilical cords(and placentas?) work when the body triggers twins versus one child?

Posted: 08 Feb 2018 07:23 PM PST

How are plants selectively bred/grown?

Posted: 08 Feb 2018 07:21 PM PST

I've heard from many times that plants and produce like the Carolina Reaper are "invented" or selectively bred. I understand how this can occur when breeding animals, but how on earth can you do this with plants?

And in theory, if somebody wanted to, could they make apples as sour as something like sour skittles? What are the limitations, if any, to what can be bred?

submitted by /u/gameratwork666
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Would it be possible to independently determine what 1 volt is without a frame of reference?

Posted: 08 Feb 2018 05:00 PM PST

I was thinking about all those 'you get sent back into the past with your phone and...' posts, and making a simple water wheel powered generator is easy enough to recharge it, relatively speaking, but how would you regulate it to +5v DC? I did a quick glance of Wikipedia and it seems to not be something that can even be easily approximated, like 'one Mississippi' for a second. So, basically, how would you be able to verify the voltage of a generator without a frame of reference since the volt was historically defined comparatively?
On an unrelated note, I like how the automod removes posts without a question mark, then the timer prevents you from resubmitting it after you are notified

submitted by /u/TheGreatNico
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If you build a higher tolerance to alcohol does this mean it takes more alcohol to get the same BAC or just more alcohol to get the same effects?

Posted: 08 Feb 2018 04:35 PM PST
vào lúc No comments:

Thursday, February 8, 2018

There's no sound in a vacuum because sounds are vibrations in the air, and in a vacuum there is no air to vibrate. So where does the energy that would go into vibrating the air particles go instead?

There's no sound in a vacuum because sounds are vibrations in the air, and in a vacuum there is no air to vibrate. So where does the energy that would go into vibrating the air particles go instead?

There's no sound in a vacuum because sounds are vibrations in the air, and in a vacuum there is no air to vibrate. So where does the energy that would go into vibrating the air particles go instead?

Posted: 07 Feb 2018 01:52 PM PST

If salt is Sodium Cloride, then what is "low sodium salt"? Is it just a marketing term or is there more?

Posted: 08 Feb 2018 02:08 AM PST

Where does heat go in space?

Posted: 08 Feb 2018 06:14 AM PST

Imagine you had a bottle of water (somehow not exploding in a vacuum), would it cool down after a while? and if so, how does it lose its heat?

submitted by /u/Sam1122334
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How does a remote island get grass and vegetation when it first forms? Or soil for that matter?

Posted: 08 Feb 2018 05:27 AM PST

Why does vomiting relieve nausea even when the nausea is not caused by something in your digestive tract?

Posted: 07 Feb 2018 10:32 PM PST

For example, nausea caused by drug use via insufflation or unsettling images.

submitted by /u/BrotherDBAD
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How exactly does injecting poultry with powerful antibiotics like Colistin affect the general population's resistance to infections?

Posted: 08 Feb 2018 12:03 AM PST

I'd read an alarming article wherein Colistin is heavily injected into Indian chickens and the implications of such practices. I was wondering how is the resistance to these medicines formed actually? Will those affected by this include people who don't eat these chickens as well?

Link to article: http://www.independent.co.uk/environment/farmers-chickens-antibiotic-boost-weight-colistin-farm-animals-infections-a8191521.html

submitted by /u/only_says_mehh
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How can amino acid supplements claim to have 7g protein and yet 0 calories?

Posted: 07 Feb 2018 11:31 PM PST

Why do crystal meth abusers usually end up having vision problems?

Posted: 07 Feb 2018 11:33 PM PST

Ex: lazy eye, one eye has changed from original color, saggy eye

submitted by /u/geminiwitch77
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How does brain differentiate between factual vs fictitious memories ?

Posted: 07 Feb 2018 06:14 PM PST

How much of the energy that goes into a PC is transformed into heat? How does it compare to a space heater?

Posted: 08 Feb 2018 01:37 AM PST

I've just asked myself this since my old PC tower does warm up my room when it's on and after all, both a space heater and a computer produce heat by sending electricity through wiring, right? The computer's is just more intricate ... I was also wondering if this would make a computer doing calculations (CERN, folding proteins, cryptocurrency, ...) an efficient replacement for a space heater on either an individual or humanity-wide level.

submitted by /u/Casual_Wizard
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What exactly does it mean to "lock" your legs and why does it cause people to faint or pass out while standing?

Posted: 07 Feb 2018 07:14 PM PST

Is it possible for an egg cell to experience nondisjunction of every chromosome, and if so, would it lead to a virgin birth?

Posted: 08 Feb 2018 03:01 AM PST

I was curious about this because of the recent NYTimes article about a species of mutant crawfish which is only female because it can clone itself through total nondisjunction in its eggs, creating clones of itself endlessly. Can such a thing happen in any species, and especially in humans? If it's possible, even if unlikely, would it lead to a virgin birth, as with the crawfish population?

submitted by /u/CodeReaper
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I know the basics of how grid fins work, but why are grid fins built with diagonal lattices instead of square lattices? What is the optimum depth for grid fins?

Posted: 07 Feb 2018 06:48 PM PST

Grid fins, the big flat grids on the sides of some missiles and rockets, are used to redirect the path of air by forcing air through square "tubes" in the grid fin.

I have some inquiries about the specifics of the shape of the grid fins.

  1. How deep should a grid fin be? If a grid fin is too shallow, there's less air correction, I assume. But what would make a grid fin too deep? Or is there no such thing as too deep when talking about grid fins?

  2. Why do grid fins use diagonal lattice grids opposed to square lattice grids? What exactly makes it more efficient?

Thanks for reading my post, I would attach a link or image but I can't in this subreddit, but I'm pretty sure my post works with all grid fins.

EDIT: I would put both engineering and physics as the flairs, but it seems like I can't do that.

submitted by /u/purpleprick
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What is the difference between all the weather models?

Posted: 08 Feb 2018 01:00 AM PST

Low-level clouds aee huge masses of condensed water vapor. High-level clouds are ice particles. When/at what temperature does this change occur?

Posted: 08 Feb 2018 12:58 AM PST

As a follow-up, is the sun's heat above the clouds make it warm enough to melt back into water vapor and condense, or does it just stay like that until it melts in atmospheric heat?

submitted by /u/GusBaur124
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What causes caffeine to make you urinate more frequently?

Posted: 08 Feb 2018 06:56 AM PST

So the solar system is revolving around SgrA* ...are we getting any closer to it or we are just revolving on a fixed orbit?

Posted: 08 Feb 2018 06:41 AM PST

Also I don't get how do you prove that black holes are real using maths ..

submitted by /u/EssamWisam
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Does smooth muscle activity help maintain body temperature?

Posted: 07 Feb 2018 07:36 PM PST

Does smooth muscle activity help maintain body temperature? If so how much compared to skeletal muscle or other ways of producing heat in the body? There was an unresolved discussion in class and I'm curious how much smooth muscle helps.

submitted by /u/ender1824
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How are manufacturers able to know the expiry date of their products?

Posted: 08 Feb 2018 06:07 AM PST

why don’t bugs take fall damage when u whack them off stuff?

Posted: 08 Feb 2018 01:20 AM PST

Why does the center of the earth never run out of heat?

Posted: 07 Feb 2018 07:42 PM PST

Why does meat change colour as it cooks?

Posted: 07 Feb 2018 06:08 PM PST
vào lúc No comments:
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