Pages

Saturday, January 6, 2018

Whats the usefulness of finding new bigger prime numbers?

Whats the usefulness of finding new bigger prime numbers?

Whats the usefulness of finding new bigger prime numbers?

Posted: 05 Jan 2018 03:21 PM PST

Can frozen food be stored indefinitely?

Posted: 06 Jan 2018 07:12 AM PST

Let's say that fridge is going to work xxx years and will never be opened. How long will the food stay edible?

submitted by /u/PM-UR-BOBS
[link] [comments]

In most representations of dinosaurs, they make a screech noise. Is there any scientific evidence that this is how they sound or is it completely made up?

Posted: 06 Jan 2018 06:47 AM PST

https://m.youtube.com/watch?v=rE_TUwYc6Vk

This is the kind of screech I'm referring to.

submitted by /u/auburnite240
[link] [comments]

How much does humidity affect the body's hydration levels?

Posted: 05 Jan 2018 08:06 PM PST

Say hypothetically two identical people lived ate and drank exactly the same amounts other then their environments relative humidity that they lived in (one extremely high the other extremely low). Would there be a noticeable hydration difference between the two people?

submitted by /u/Onekama
[link] [comments]

Are the predictions about a stellar merger in 2022 still on track?

Posted: 06 Jan 2018 05:01 AM PST

Last a paper was published, predicting that the binary star system KIC 9832227, was going to merge in 2022.2±0.6.

Are there any updates on whether this prediction is still accurate? Also, are there any plans to make frequent observations of the merger when it does finally occur?

submitted by /u/Danack
[link] [comments]

Why are volts lost due to internal resistance?

Posted: 06 Jan 2018 04:44 AM PST

Can someone explain why volts are lost due to internal resistance when current is drawn from a cell? From my understanding as resistance increases so does voltage so if anything should the tpd not increase?

submitted by /u/Shaunm24
[link] [comments]

How can nuclear reactors work without steam?

Posted: 06 Jan 2018 06:24 AM PST

There are spacecraft in space right now that are powered by onboard nuclear reactors. Surely they don't use steam to spin a turbine like a normal land-based nuclear power plant. That's a lot of extra weight to carry into space. Turbines are heavy.

So how do these reactors work? Have we found a way to convert heat directly into electricity?

submitted by /u/cheetoes24
[link] [comments]

Is there a measurable increase in salinity of surounding waterways after a particularly cold winter when salt is used in the roadways?

Posted: 05 Jan 2018 05:48 PM PST

Wondering because I see salt stains everywhere and I grew up around the Chesapeake Bay area.

submitted by /u/SpicyRutabaga
[link] [comments]

How does Schumann's resonance work?

Posted: 06 Jan 2018 05:15 AM PST

Hello r/askscience~
I stumbled upon this thing called "Schumann's resonance" and apparently it makes whatever music you play on top of it seem... well... different.

I wonder how it works (scientificly). I would guess it is a sound in frequency that differs (in this case by 7.83 Hz) from the natural sound created between the surface of the earth and the atmosphere due to earth's motion, but I don't really know.

I would also like to know if it has any proven / theoretical effects on the listener. I personally use this to enhance the music I hear by playing it in the background, but I would like to know more about how it is suppossed to be used.

Reference: https://www.youtube.com/watch?v=h-nk3fIUsKA

submitted by /u/FurySh0ck
[link] [comments]

In the photoelectric effect why can't low frequency photons knock an electron to a higher orbit and then another knock it out of orbit the rest of the way?

Posted: 06 Jan 2018 05:09 AM PST

Would it be possible for a computer to choose a random number out of an infinite number of possibilities? Or there is no way to program such thing

Posted: 05 Jan 2018 03:24 PM PST

Why does alcohol burn when you ingest it ?

Posted: 05 Jan 2018 09:25 PM PST

Can an alpha particle and two beta particles be combined to form a Helium atom?

Posted: 06 Jan 2018 07:51 AM PST

If this is the case, could other elements be formed by combining types of radiation—for example two alpha particles and sixteen beta particles to form Oxygen?

submitted by /u/Peanut_Legend
[link] [comments]

What determines raindrop size?

Posted: 05 Jan 2018 11:32 AM PST

Thought of this after walking through rain this morning with incredibly fine particles, it was almost like a thick mist. Why were the water droplets so small, and why are they sometimes pretty large?

submitted by /u/DrunkFishBreatheAir
[link] [comments]

How is natural exhaustion different from being tired because of medicine?

Posted: 05 Jan 2018 03:26 PM PST

If you take medicine to help with sleep such as melatonin, or even just take a nighttime cold pill that will make you drowsy, would it be unhealthy to stay awake? Even if you've had a full nights rest previously.

submitted by /u/MGFilthy
[link] [comments]

How does a Magnifying Mirror work any differently than a regular mirror?

Posted: 06 Jan 2018 06:45 AM PST

Are frozen fruits and vegetables till healthy and nutritious for you?

Posted: 05 Jan 2018 08:14 PM PST

How similar are your fingerprints to your parents?

Posted: 05 Jan 2018 10:13 PM PST

Is your fingerprint a combination of that of your parents or is it totally different and new from them? I was thinking of this in context to fingerprint locks on cell phones. If both of my parents combined their fingerprints into 1 saved fingerprint onto a phone, would I be able to unlock it using my fingerprint? If so, how far back would you be able to trace the similarities in fingerprints or could there be any possible way to even do such a thing?

submitted by /u/owencrook
[link] [comments]

How is the transit method of exoplanet detection used to determine the planet's volume?

Posted: 05 Jan 2018 08:03 PM PST

I've been searching for the answer to this, and so far, my best answer is the the drop in luminosity = planet radius2 x star radius2 , but this does not take into consideration how far the planet is from its star. A planet orbiting 0.5 AU from its star would have a much smaller drop than a planet orbiting at 50 AU, correct? So why is this not taken into consideration when calculating the planet's radius? And if it is, then what is the equation?

submitted by /u/tabanidAasvogel
[link] [comments]

Could we chemically synthesize new food flavors that haven't been tasted before?

Posted: 05 Jan 2018 07:13 PM PST

Surely all the herbs and spices created naturally couldn't encompass all the possibilities right? Are there examples of this being done? Could any of them be good?

submitted by /u/TrickBlimp
[link] [comments]

How big of an impact does the gyroscopic effect of wheels have on the stability of a car?

Posted: 05 Jan 2018 09:52 PM PST

What makes mirrors reflective?

Posted: 05 Jan 2018 02:55 PM PST

How exactly this can happen?

Posted: 05 Jan 2018 10:38 PM PST

So I have seen this picture here on some sub and I am wondering that how can the eyes open and closed(in mirror) at the same time? Doesn't light travels at very hight speed (like 2.99km/s) that it is almost impossible to capture two different light sources at the same time for the same object?

submitted by /u/pedomulla786
[link] [comments]
vào lúc No comments:

Friday, January 5, 2018

Why is it that the time of useful consciousness above 10,000m altitude is under one minute when we can easily hold our breath for that long without passing out?

Why is it that the time of useful consciousness above 10,000m altitude is under one minute when we can easily hold our breath for that long without passing out?

Why is it that the time of useful consciousness above 10,000m altitude is under one minute when we can easily hold our breath for that long without passing out?

Posted: 05 Jan 2018 01:28 AM PST

I found some references about O2 partial pressure in venous blood (40 mmHg). That makes me think that at low pressure you might actually lose O2 with every breath. An O2 partial pressure of 40 mmHg correspond to an altitude of about 10km which seems to match with the altitude where your time of useful consciousness drastically drops.

Is that all there is to it?

submitted by /u/electric_ionland
[link] [comments]

Is pyrolysis of food possible in boiling water under sufficient pressure?

Posted: 04 Jan 2018 05:02 PM PST

At sea level, boiling water will not reach high enough temperatures to cause pyrolysis, but if the boiling is done in a pressure vessel so that the water can reach higher temperatures before boiling, is it possible to char food? How high would that pressure have to be?

submitted by /u/FTLSquid
[link] [comments]

So the carrier particle for the electromagnetic force are photons. Therefore if I have an electric or magnetic field what type of electromagnetic radiation is being transmitted?

Posted: 05 Jan 2018 01:39 AM PST

Also if I knew the type of radiation could I make the force by transmitting those photons?

submitted by /u/Mizza_
[link] [comments]

Which is more ideal for the human body to inhabit; a planet with 0.5G or 1.5G?

Posted: 04 Jan 2018 07:45 AM PST

What is the LC in a LCD?

Posted: 05 Jan 2018 06:03 AM PST

Every article I literally just refers to it as "Liquid Crystal," but what type of crystal, how is it made into a liquid?

submitted by /u/memynameandmyself
[link] [comments]

Why didn't the Jupiter trojans coalesce into a larger object?

Posted: 05 Jan 2018 05:39 AM PST

Why does my body/legs/knees ache when I don't get enough sleep?

Posted: 04 Jan 2018 08:12 AM PST

I know how critical getting sufficient amount of sleep is for our bodies, but every know and then I'll only get about 3-4 hours of sleep and when I wake up, usually my knees are achey as if I just ran on concrete pavement for a few hours.. Nothing too bad. Any home remedies got that before I start my day?

submitted by /u/lilkhmerkid4u
[link] [comments]

Are the shadows of other planets cast onto earth, similar to that of an eclipse?

Posted: 04 Jan 2018 06:42 PM PST

How much mixing is there between layers of the Earth? Is a molecule 4,000 km down ever going to reach the surface?

Posted: 04 Jan 2018 10:33 AM PST

How does scientist calculate the mass of celestial bodies?

Posted: 05 Jan 2018 03:37 AM PST

I am very much confused about this question. How does scientist calculate the mass of celestial bodies?

submitted by /u/709snkumar
[link] [comments]

Is it possible for a eunuch to achieve orgasm?

Posted: 04 Jan 2018 08:22 AM PST

If a male has had both his penis and testicles removed, would it still be possible to achieve orgasm? Would the lack of sex hormones make it impossible?

submitted by /u/knarf86
[link] [comments]

Why does a Green Screen need to be green?

Posted: 04 Jan 2018 04:03 PM PST

Why isn't it a red screen or maybe an orange screen?

submitted by /u/t7berg
[link] [comments]

Could two protons produce a black hole?

Posted: 04 Jan 2018 06:27 PM PST

Why isn't Juipter a homogeneous mix of gases?

Posted: 04 Jan 2018 09:02 PM PST

I love looking at the beautiful images coming out of the Juno spacecraft on Twitter and NASA websites. It reminds me of inkblots in water, where there is an amazing amount of detail in the ink before it fades out into a homogeneous color. But that got me thinking. If Jupiter is full of giant storms and is very old, why isn't it just a completely mixed planet by now? What dynamics exists that keep some parts (sometimes shockingly) different colors (and I assume wildly different compositions)?

submitted by /u/TakeTwiceDailey
[link] [comments]

If Jupiter was condensed, how big would it be compared to Earth?

Posted: 04 Jan 2018 08:19 AM PST

So from what I understand, Jupiter is entirely made of gas. I know that gases like helium have an expansion ratio, which is how much space it occupies when it evaporates.

Is it possible to get an average expansion ratio for Jupiter and therefore a measurement of how large Jupiter would be (in physical dimensions e.g. diameter) if we cooled it enough to condense?

submitted by /u/MrCrit
[link] [comments]

How is carbon fiber so strong but so light?

Posted: 04 Jan 2018 09:06 PM PST

How can mobile cameras see TV remote infrared light?

Posted: 05 Jan 2018 05:46 AM PST

Is it possible to insulate a house so well that HVAC isn’t necessary?

Posted: 04 Jan 2018 07:33 PM PST

I'm wondering specifically about climates that have a very wide temperature range such as in Ontario. If this is acheivable what R-value would it require and what other special requirements would it take?

submitted by /u/StupidInternetVoice
[link] [comments]

Is there more matter vs anti-matter?

Posted: 04 Jan 2018 09:16 PM PST

When matter and a corresponding particle of anti-matter interact they annihilate. Does this indicate that there is more matter than anti-matter in the universe? I ask as I assume if they were the same amount it'd be constant chaotic destructive annihilations.

My understanding is that so far as we have observed anti-matter acts like matter? Could the universe function as is if we instead had a saturation of anti-matter? Can energy be converted/is strictly matter or can it be anti-matter as well? Or am I way off base?

submitted by /u/SenorDarcy
[link] [comments]
vào lúc No comments:

Thursday, January 4, 2018

How many people does the average person pass a common cold to?

How many people does the average person pass a common cold to?

How many people does the average person pass a common cold to?

Posted: 04 Jan 2018 01:23 AM PST

I've been wondering this for a while. Is there a way to estimate the amount of people a person has coughed on, etc, in order to pass a cold virus to them?

submitted by /u/Skrtmvsterr
[link] [comments]

Which fundamental force does dark energy use?

Posted: 04 Jan 2018 02:34 AM PST

Do the forces of dark energy propagate with gravity, electro magnetism, strong or the weak force? Or a combination of these?

Could it be that there is some unknown 5th fundamental force for dark energy?

submitted by /u/empire314
[link] [comments]

How does speculative execution in CPUs work?

Posted: 03 Jan 2018 10:28 PM PST

"Speculative execution" in CPUs has been mentioned in the news recently due to the Intel bug. What operations can be speculatively executed at the CPU level and how does the processor know it has a likelihood of a speedup without any higher level understanding of the problem it is solving?

submitted by /u/NonindustrialFront
[link] [comments]

If Nitrogen is so unreactive, then why is it used in explosives and fuels?

Posted: 04 Jan 2018 03:21 AM PST

For an example, nitromethane(CH3NO2) and Hydrazine(N2H4) are both used as fuels, and when they are mixed together they produce an explosive salt. Why does this happen?

submitted by /u/Asskvar1
[link] [comments]

What role does black body radiation and albedo play for the average temperature on earth (and hence habitability)?

Posted: 04 Jan 2018 01:30 AM PST

What effect would a violation in CPT symmetry have on our current understanding of physics?

Posted: 03 Jan 2018 08:36 PM PST

I only have a "practical" understanding of quantum physics from taking physical chemistry, and so the "finer points" of modern particle physics are lost on me. I recently read about how there are no individual symmetries for charge, parity, or time and instead there appears to be a single symmetry of all of these together. This lead me to wonder what the implications of this theory being incorrect would be.

submitted by /u/Nowhere_Man_Forever
[link] [comments]

In the Rutherford Gold Foil Experiment, why did the alpha particles collide with the gold nuclei but not with the oxygen nuclei in the air?

Posted: 03 Jan 2018 06:04 PM PST

In the Rutherford Gold Foil experiment, alpha particles were shot at a piece of gold foil. Some particles collided with the nuclei of the gold atoms in the foil and were deflected, which is how Rutherford realized the nature of the nucleus. Why, then, would the oxygen atoms in the path of the alpha beam not have a similar interaction with the particles?

submitted by /u/zachisosum
[link] [comments]

Won't landfills become fossil fuels in the future?

Posted: 04 Jan 2018 12:06 AM PST

Obviously assuming they are met with the same geologic phenomena that created existing fossil fuels. Essentially they are big piles of organic waste and plastic, which are already hydrocarbons.

I guess I'm just curious as to what a future geologist would find when studying an area that was a landfill.

submitted by /u/datusernames
[link] [comments]

If gravity on Mars is roughly 2.5 times weaker than on Earth, would you be able to jump 2.5 times higher or is it not a direct relationship?

Posted: 04 Jan 2018 06:33 AM PST

I am referring to the gravitational acceleration on Mars (~3.7) vs Earth (~9.8) when I say 2.5 times weaker

submitted by /u/lil_mattie
[link] [comments]

How do digital alarm clocks remain so accurate over extended periods of time?

Posted: 03 Jan 2018 08:30 PM PST

I was wondering about my $5 alarm clock today. It is cheaply made, but has consistently shown the correct time since I bought it. If an alarm clock was off by a mere second every hour, it would only be 1/3600th or about .03% off every hour. That seems so insignificant, but that would make the clock off by a minute after just 2.5 days, and off by over 2 hours in a year.

submitted by /u/DrScitt
[link] [comments]

Does dark matter surround all galaxies? If so, how?

Posted: 04 Jan 2018 04:16 AM PST

I had read in a textbook (Astronomy Today, 8th Edition) that

Then, at later times, normal matter was drawn by gravity into the regions of highest density, eventually forming galaxies and galaxy clusters. This picture explains why so much dark matter is found on the outside of visible galaxies. (P705-706, Chapter 27)

This seemed to indicate to me that most galaxies are surrounded by much dark matter and all are surrounded by some. I then read that baryon acoustic oscillations ('sound' waves of matter created by radiation forcing it to expand outward rapidly as a result of the coupling of matter and radiation that occurred in the time from the big bang to before 10-20 seconds after the big bang) in the first created galaxies surrounding the dark matter clusters because of the differing density from the surrounding space.

The shell [of matter ejected from the dark matter by its interaction with radiation] continues to expand until the epoch of decoupling at which time the push from the radiation stops and the shell stalls. Subsequently the shell simply expands along with the rest of the universe. But because the shell itself represents a denser-than-average part of the universe, it too will tend to attract more matter and it will eventually form galaxies of its own. The result is that every dark matter region that forms a galaxy or galaxy cluster is expected to have associated with it a secondary shell of galaxies. (P709, Chapter 27)

This left me a little confused as to if dark matter is present surrounding all galaxies. I looked it up but didn't find a clear answer and much of it was a little hard to understand.

These shells of galaxies form as a result of normal matter ejected into regions relatively close to high densities of dark matter which would imply that most of the surrounding dark matter accredited into the mass at the center. If this is true then it seems that there wouldn't be much dark matter left to surround these. Because of this is there any significant difference between the shells and the galaxy/cluster that formed as a result of the high density of dark matter.

EDIT: From what I read online, it seemed assumed that dark matter 'halos' surround all galaxies but I couldn't find anything to explain why in regards to the baryon acoustic oscillations.

submitted by /u/BingRazer
[link] [comments]

Are oceans becoming increasingly saltier?

Posted: 03 Jan 2018 11:40 PM PST

The saltiness of oceans and seas is, if I recall correctly, due to minerals transferring to the oceans via rivers. This implies that oceans were not always this salty and that they become even saltier as time moves on. Is this the case? Can marine animals survive if the oceans become much saltier?

submitted by /u/schwifty_man
[link] [comments]

Does blood coagulate in some areas faster than others? Where and why?

Posted: 03 Jan 2018 11:15 PM PST

Does blood coagulate at the same rate everywhere in the body?

submitted by /u/DatnwordAL
[link] [comments]

How do we differentiate species based on genetics? What criteria would groups of humans have to meet genetically to be classified as different species ?

Posted: 03 Jan 2018 11:11 PM PST

The classical definition of species are two species that can mate and produce viable offspring but that isn't always perfect and we differentiate based on genetics alot for this reason.

So my question is, what are the criteria for differentiating species based on genetics and what would it take to differentiate humans by species?

Note that this isn't racially motivated and I realize the difference between dark skin is just a few alleles, so we could very likely be differentiating different groups of white humans from each other.

submitted by /u/mizzrym91
[link] [comments]

Steam baths have been used medicinally by many cultures worldwide. Are there any studies showing their effectiveness for any ailment, or was the idea widespread just because people thought they were "sweating out" the disease?

Posted: 03 Jan 2018 09:04 PM PST

Are we able to increase CPU hyperthreading (ie 2 threads per physical core now to 3, 4, ...)?

Posted: 04 Jan 2018 06:35 AM PST

What is the limit on hyperthreading? Currently AMD and Intel have CPUs some of which feature hyperthreading at 2 threads per physical core.

Why not 3 or 4 or more? Is that possible? What are the limitations? Is it easier to just physically add more cores?

Is the limitation on adding physical cores manufacturing technology and lithography size?

submitted by /u/ag11600
[link] [comments]

I've heard that no two colds are the same, and that our bodies become immune to each cold we get. If that's true, how often do our immune systems deflect colds we've become immune to?

Posted: 03 Jan 2018 02:47 PM PST

The capacitor in a buck converter?

Posted: 04 Jan 2018 04:40 AM PST

Why is there a capacitor in a buck converter? It seems as though it is just being charged by the inductor and not really contributing to powering the load.

submitted by /u/Titrer
[link] [comments]

What is the coldest fire?

Posted: 03 Jan 2018 01:36 PM PST

Obviously fire is hot and there are various degrees of hot flame. Ex. Blue and purple flame. Which each have corresponding temperatures. What is the coldest flame and its temperature? And why is it that cold?

submitted by /u/TangiblePragmatism
[link] [comments]

Could a person really hold onto a door in a room that has a hull breach in space? How much force would it take to hold on?

Posted: 03 Jan 2018 07:45 PM PST

Frequently in movies, you see a hull breach in a spaceship, and a character holds onto a door or something else in the room while it breaches so that they aren't sucked outside. Is this realistic? Could a person really hold on while a room is bring vacated of air? If so, how strong would a person have to be to hold on?

submitted by /u/grandsonofclemson
[link] [comments]

If sound is the result of vibrations of air molecules, why is wind not the loudest thing ever?

Posted: 03 Jan 2018 08:16 PM PST

Why does your Phones Microphone not pick up the voice of the other person when a call is on Speaker?

Posted: 03 Jan 2018 06:01 PM PST

Does a city or urban area take longer to cool at night that a rural area?

Posted: 03 Jan 2018 09:21 PM PST

I'm in the Philippines and noticed that a lot of construction work takes place at night, I'm guessing this is because it's cooler so easier on the workers, a few of us where talking at the bar and where wondering if a city takes longer to cool down at night than say a small rural village, does the tarmac and concrete release heat slower into the night meaning that the ambient temp stays higher, or is the difference negligible compared to some corn fields?

submitted by /u/wezatron4000
[link] [comments]

Planks constant states that the position uncertainty of an electron times the momentum uncertainty must be greater than or equal to planks constant divided by two. Why is this? What would happen otherwise, or what is preventing it to happen? Or, how do we know this?

Posted: 03 Jan 2018 06:28 PM PST
vào lúc No comments:
Subscribe to: Posts (Atom)