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Monday, April 11, 2016

What would the horizon look like if you were standing on an infinitely stretching and perfectly flat plane?

What would the horizon look like if you were standing on an infinitely stretching and perfectly flat plane?

What would the horizon look like if you were standing on an infinitely stretching and perfectly flat plane?

Posted: 11 Apr 2016 03:52 AM PDT

My understanding is that the horizon is where it appears to be because of the curvature of the Earth, and if the Earth was smaller the horizon would be closer/lower. Obviously on an infinitely-stretching plane the horizon couldn't keep going up, but where is the limit?

submitted by /u/AhrmiintheUnseen
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Can an accretion disk around a black hole become so dense that fusion begins and generates a toroidal star?

Posted: 10 Apr 2016 05:31 PM PDT

How genuine are Dr. Mehran Keshe's claims that the Earth will soon be hit by mega earthquakes which will claim around 40 million lives and will divide the continents?

Posted: 11 Apr 2016 12:06 AM PDT

Can you represent PI in a finite number of digits in any number system?

Posted: 10 Apr 2016 07:29 AM PDT

From a computer science course I know that you cannot represent the number 1/10 in a binary number system. But you can do it in a decimal number system. Is there a system where you can represent PI in a finite amount of digits?

submitted by /u/xlogic87
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How does voyager organize the data it sends us?

Posted: 10 Apr 2016 11:16 PM PDT

I just came across http://eyes.nasa.gov/dsn/dsn.html, a website that will show the deep space network activity when the DSS 63 antenna started receiving a signal from voyager 1. It got me thinking, does the data transmitted have any resemblance to a modern networking packet? If I could get a hold of that raw stream of data what would I need to do get it into something human readable? I guess the crux of the question is how does voyager structure the data it sends our way? If there are resources can you point me to where I could read? Does NASA or whoever have some sort of source code repository I could look over?

submitted by /u/hairahcaz
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How do we know we have to sleep eight hours per day? Why not six or ten?

Posted: 10 Apr 2016 11:52 PM PDT

The human hearing range goes from 20 Hz to 200 kHz, but it's wider when we are young. Is it a case of degradation or does the extra ability serve a purpose for infant and children?

Posted: 10 Apr 2016 09:48 PM PDT

I can assume that we see at our best when we are young and over time, our sight gets worse as our eyes wear out. Is it the same for hearing? Or is there a purposeful reason as to why our hearing is better when we are young (maybe something to do with language acquisition), and then we shed that ability when it is no longer necessary + casual wear out?

submitted by /u/ads8888
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Can you increase how long something glows in the dark for?

Posted: 10 Apr 2016 09:39 AM PDT

I was wondering if the brightness/intensity of light absorbed by something glow in the dark just contributes to the brightness, or also the amount of time it stays luminous for. Do different colours of light make the glow more intense?

submitted by /u/Rouge_Danno
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Is there a maximum temperature my microwave oven can heat something up to?

Posted: 10 Apr 2016 11:54 PM PDT

How can a computer program can prevent the computer from "knowing" its code? (like closed source programs)

Posted: 10 Apr 2016 06:48 PM PDT

In non open-source programs, you can't check the source code from the program, but it still executes and runs on the computer. Shouldn't there be a way to know what that code is?

From what I understand it works like a blackbox, you feed it input and it gives outputs acording to the code. But how can it prevent me from checking the code?

submitted by /u/lemonaplepie
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[Mathematics] When you type the symbol for Pi into an equation on your calculator, how many decimal places does it take into account when finding an answer?

Posted: 10 Apr 2016 09:33 PM PDT

Are new vs old tires (treadwear difference) enough to affect speedometer calibrarion?

Posted: 10 Apr 2016 07:26 AM PDT

How does a flamethrower prevent the back flow of combustion as it shoots a stream of ignited fuel?

Posted: 10 Apr 2016 01:34 PM PDT

In a flamethrower like this as the fuel gets shot out of the barrel, it gets ignited creating stream of fire.

I'm assuming the fuel gets ignited after it exits the barrel, cause in the gif, theres no visible flame at the tip of the barrel. But how does the flamethrower prevent the flame from spreading into the barrel and ignite the fuel that's being constantly spewed out? Or if not that, how is combustion of the fumes prevented?

submitted by /u/jayf95
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Is there any substantial evidence that chiropractic care is effective?

Posted: 10 Apr 2016 03:47 PM PDT

How do babies get prescriptions without being able to communicate with their optometrist?

Posted: 10 Apr 2016 04:24 PM PDT

Why do people never forget how to ride a bike once they've learned?

Posted: 10 Apr 2016 03:23 PM PDT

Why do our noses get runny when we cry?

Posted: 10 Apr 2016 11:59 PM PDT

It happens to me all the time and I have no idea why it does. Is it similar to our noses getting runny when we eat spicy food?

submitted by /u/RVD420smokedurass
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With nothing but hydrogen and oxygen, how come water isn't flammable?

Posted: 10 Apr 2016 10:09 PM PDT

It sounds like the ingredients of a bomb!

submitted by /u/refwdfwdrepost
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Is there an altitude above which the atmosphere is effectively sterile?

Posted: 10 Apr 2016 05:24 PM PDT

How long do clouds last?

Posted: 10 Apr 2016 07:11 PM PDT

There are various types of clouds (stratus, cumulo-nimbus, etc.) Are these more or less perpetual, do they merge, or do they eventually dissipate?

submitted by /u/blue_shadow_
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Can the electromagnetic absorption characteristics of carbon dioxide be accurately modeled?

Posted: 10 Apr 2016 10:24 AM PDT

Do we know how colliding black holes impart momentum?

Posted: 11 Apr 2016 12:41 AM PDT

When two stellar bodies collide with one another, we know that momentum is imparted to the newly combined body. What do we know about black holes colliding with one another?

submitted by /u/somtwo
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Did the nuclear testing during the Cold War have any effect on the climate?

Posted: 10 Apr 2016 05:28 PM PDT

I mean...how hot does an H bomb get/make its surrounding environment? Something like the Sun? If only for a moment, we set off some 2050 or so bombs between all of the countries.

We've probably all seen this time lapse of testing done...

submitted by /u/Wisdom_from_the_Ages
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Sunday, April 10, 2016

What is the meaning and cause of T-symmetry violation in the weak interaction?

What is the meaning and cause of T-symmetry violation in the weak interaction?

What is the meaning and cause of T-symmetry violation in the weak interaction?

Posted: 10 Apr 2016 04:23 AM PDT

From what I understand, the weak interaction violates time reversal symmetry, but the other forces don't. Given that T-symmetry is violated by the arrow of time, why don't the other interactions exhibit this violation? Also, what are examples of it?

I have a basic understanding that the source of C and P violation in the weak interaction is due to the weak force only acting on left-handed particles and right-handed antiparticles. Is there a similar reason for the T violation observed in the weak interaction (and only the weak)?

submitted by /u/mrwho995
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What would an atom "look" like if you were small enough to see it?

Posted: 09 Apr 2016 06:25 PM PDT

The main thing that I want to know is, would the atom look like the traditional sphere shape or something different, any additional information is welcome though!

submitted by /u/theMushypotato
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I heated up water in a food can by a heat lamp and got a strange temperature graph. Why did the temperature rise in this pattern?

Posted: 10 Apr 2016 01:32 AM PDT

A few weeks ago I was doing an experiment for my physics assignment. I had 2 cups of water that was refrigerated to near 0 degrees inside a food can with no labels and had aluminum foil over the top. I then had aluminum foil in a concave shape around the can of water and over the top. I also had white paper on the floor and next to the heat lamp so most of the light would stay in the little 'cave'. I currently don't have photos so I roughly recreated the experiment design on paint:

Birds eye view of the experiment

Side view

Obviously its not to scale but if it helps the measurements of the cans are:

  • Height: 11.5 centimeters

  • Circumference: .4 centimeters

The aluminum foil wall had white A4 paper on the outside to help it stand.

I started tracking the temperature over 20 minutes when the heat lamp was turned on when the water was ~2.4 C degrees. I tracked 5 different cans and they all similar rising temperature rates. Here's a graph of the temperature of all five cans.

Can someone explain why the water had a strange temperature rate? I initially thought that the graph would be displaying a exponential graph but instead it showed that instead.

submitted by /u/NeutralGreed
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Why does Saturn have rings?

Posted: 10 Apr 2016 02:37 AM PDT

Is it because of a property of Saturn or an event that caused it to have rings?

Also, why doesn't the matter in the rings clump together to form moons?

submitted by /u/Ptyalin
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What's the fastest moving visible star, in relation to other visible stars?

Posted: 09 Apr 2016 07:00 PM PDT

Inspired by this big dipper gif: https://www.reddit.com/r/educationalgifs/comments/4e1gch/the_big_dipper_100000_bc_10000_ad/

Which star/point of light, visible to the naked eye, is moving fastest in relation to the other stars? Are there any that will noticeably shift in the sky during the next 50 years?

submitted by /u/EatingCake
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Why doesn't dark matter collapse together to form black holes?

Posted: 09 Apr 2016 10:07 AM PDT

If they aren't really interacting what force is stopping their collapse?

submitted by /u/SYLOH
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If you travel at next to near the speed of light in space, would there be any resistance? (and you are made of matter)

Posted: 10 Apr 2016 05:42 AM PDT

If it ever got cold enough for our atmosphere to condense, how deep would the sea of liquid nitrogen, oxygen and other gases be on Earth's surface, given its current terrain?

Posted: 09 Apr 2016 09:08 AM PDT

Would you be able to see a nuclear explosion on the moon with the naked eye from earth?

Posted: 09 Apr 2016 06:57 AM PDT

Considering the nuclear bomb is 50 Megaton, and there's no clouds during night time.

submitted by /u/PatientlyWaitingfy
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How can solar sails work? Where does the momentum come from?

Posted: 09 Apr 2016 02:17 PM PDT

Solar sails work by using the momentum from photons to "push" the sail, but my understanding is that photons can only travel at c. If the photon is traveling at c, then it bounces off of the sail, still moving at c. Where did the momentum to move the sail come from?

submitted by /u/Partsofspeech87
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What happens to matter at the center of a nuclear explosion?

Posted: 10 Apr 2016 01:42 AM PDT

Civil Engg:How tuned mass damper works to resist earthquake vibrations? How it is tuned to the building?

Posted: 09 Apr 2016 11:20 AM PDT

As tuned mass damper is usually light weight ball compared to building which is attached on top of building and move out of phase relative to it.

submitted by /u/Khurram_mehdi
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Why does electricity form and cause lightning in a volcanic eruption?

Posted: 09 Apr 2016 09:56 AM PDT

Is there ever any variation between the individual Gs, As, Ts, and Cs of a single DNA strain?

Posted: 10 Apr 2016 01:16 AM PDT

Clarification because I really know very little about DNA so my question might sound like gibberish: Can two separate G "connectors" be slightly different when compared or all they all identical?

submitted by /u/clymo
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Do high energy electrons interact chemically with conpounds?

Posted: 09 Apr 2016 06:45 PM PDT

I want to know if free electrons such as in a cathode ray tube interact chemically and if do how?

If they do could you use them to cause a reduction half reaction without an associated oxydation?

submitted by /u/browncoat_girl
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What are + and x modes of gravitational waves?

Posted: 09 Apr 2016 01:55 PM PDT

I am currently reading a publication of Tomimatsu Tomimatsu . In his introduction he mentioned x and + modes of waves and i have no idea what that is. My search tourned out some x and o modes, is this the same? I study physics in a different language so the confusion may be caused by that.

submitted by /u/maxdero
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How is the concept of Transfer of Training helpful in Psychology?

Posted: 09 Apr 2016 09:48 AM PDT
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Saturday, April 9, 2016

Why are there mountains on Mars that are much higher than the highest mountains on other planets in the solar system?

Why are there mountains on Mars that are much higher than the highest mountains on other planets in the solar system?

Why are there mountains on Mars that are much higher than the highest mountains on other planets in the solar system?

Posted: 09 Apr 2016 04:17 AM PDT

There is Arsia Mons (5.6 mi), Pavonis Mons (6.8 mi), Elysium Mons (7.8 mi), Ascraeus Mons (9.3 mi) and Olympus Mons (13.7 mi) that are higher than Mount Everest (5.5 mi), earth's highest mountain (measured from sea level). All of those high mountains on Mars are volcanoes as well. Is there an explanation?

submitted by /u/bastilam
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If particles are point-like, how are they not gravitational singularities?

Posted: 08 Apr 2016 10:37 AM PDT

I understand gravitational singularities are not a matter of mass, but density. I also understand that particle colliders have established an upper-limit to the volume of an electron. If the fundamental particles are truly point-like, then whatever their mass, they would necessarily form gravitational singularities. Would the event horizons of these particles themselves be extremely small? They would still undergo hawking radiation I presume, which would mean that they would evaporate rapidly..?

I thought maybe the answer depends on quantum mechanics, that the wave-function means that though the particle is point-like its possible positions are distributed through space? But flipping the question around, what is the quantum state of a black hole? Does it too have a wave function, and is that wave function entirely contained within the event horizon? (apart from hawking radiation)

Is this just the great unsolved problem in physics of reconciling gravity and quantum mechanics, the micro and the macro?

submitted by /u/ateles-
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I heard this claim that 8000 years ago, Taklamakan Desert was a lake as big as the Black Sea. Is this true?

Posted: 09 Apr 2016 06:08 AM PDT

Is there any research on a 'Call of Duty' game effect and younger adults joining the military?

Posted: 09 Apr 2016 06:47 AM PDT

I was talking to a guy at work and his son is in the military and the son was trying to get out because it wasn't what he thought it was.

submitted by /u/ThundaMaka
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How is the Polar Star possible?

Posted: 09 Apr 2016 05:59 AM PDT

Polaris is a star that has appeared in the sky exactly (or very nearly) over the north pole. With the earth's poler axis constantly moving (earth orbit around sun, sun orbit around Galaxy center, etc.), how is it possible that the Polar Star is always in the same place relative to the earth? If it's a coincidence of stars path coinciding exactly with the north pole axis, it an incredible coincidence, isn't it?

submitted by /u/toxa26
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If we know that the enthalpy of a reaction is x kJ/mol, how can we find the enthalpy of the products and reactants?

Posted: 09 Apr 2016 03:29 AM PDT

How does the earth make water? Or is there a fixed supply.

Posted: 09 Apr 2016 01:51 AM PDT

Has there ever been an experiment that showed that light can slow down in a vacuum?

Posted: 09 Apr 2016 06:13 AM PDT

Moreover, is it even possible for light to do so? I heard from a friend the other day that there was apparently some experiment that showed light can slow down in a vacuum, depending on where you point it. Apparently this is evidence for the matrix (this was on an episode of through the wormhole apparently ).

Doesn't relativity depend on constant c in a vacuum?

submitted by /u/xShOtz
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Is there a finite limit to how large/massive a star can be?

Posted: 09 Apr 2016 04:48 AM PDT

We know of stars that exist such as VY Canis Majoris, NML Cygni, RW Cephei, and UY Scuti. They are all upwards of 2,000,000,000KM (roughly 1,250,000,000 miles) in diameter. So just how large can a star get?

submitted by /u/HartzyBoi
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If electric currents make magnetic fields, and electrons in atoms are constantly moving, why isn't everything magnetic?

Posted: 09 Apr 2016 05:16 AM PDT

Why aren't there uuu and ddd nucleons?

Posted: 08 Apr 2016 07:25 AM PDT

So to my understanding the nucleons are made of up and down only and have spin 1/2, while the delta baryons are u/d only and have spin 3/2.

Why are there not uuu and ddd baryons with spin 1/2?

submitted by /u/bigscience87
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Do people with Situs Inversus (reversed/mirrored organs) tend more to left-hand dominance?

Posted: 08 Apr 2016 03:05 PM PDT

Wikipedia claims that globally humans are 87-92% right hand dominant. Situs inversus seems pretty rare at roughly 1 in 10,000. Do we have statistics on the handedness of those with Situs inversus?

Bonus question: Do we know if right-left lateralization of brain function is reversed in people with Situs Inversus?

submitted by /u/mavaction
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How does habituation in the olfactory system work? If I habituate and then smell a stronger odor, is there something like a 'subtraction'?

Posted: 09 Apr 2016 05:47 AM PDT

Let's say I like to smell light citrus odors, but cannot stand strong citrus odors. During an experiment, I get exposed to a light citrus odor and habituate to it.

What happens when I get exposed to the strong citrus odor (more or less) directly afterwards that habituation? Is there something like a 'subtraction'? Does the strong citrus odor appear different to me, maybe closer to a light odor, because some parts of it are ignored due to the habituation?

submitted by /u/EZIC-Agent
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Why does global warming make certain areas colder than usual?

Posted: 08 Apr 2016 10:05 PM PDT

I ask because I see a friend from high school post "There are people complaining about global warming...its April 8th and there is a winter advisory in place?"

So why is global warming making certain areas, in this example Wisconsin, have such sporadic and cold temperatures this year?

submitted by /u/EpiikDude
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Why does blood change color when exposed to bleach?

Posted: 09 Apr 2016 02:52 AM PDT

I had a particularly bad nosebleed today (pronounced waterfall of blood) and I decided that I needed to disinfect my bathroom. I sprayed some Clorox cleaner (which contains a high bleach content) and saw that my blood not only washed down the sink, some of it hardened and even turned brown and black. Why does this happen?

submitted by /u/themunchingbrotato
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Is there a correlation between intellect and happiness?

Posted: 08 Apr 2016 08:18 PM PDT

My shower thought for the day:

Is there a correlation between how much you know and how happy you are?

Is there a propensity for people who are constantly seeking out more information to be less happy?

Are people who have no desire to learn more than what they learned early in life generally more content?

Is there scientific basis for the phrase "ignorance is bliss"?

Why is being a "know it all" frowned upon by the vast majority?

submitted by /u/KnewHere
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Is the electromagnetic spectrum infinite?

Posted: 08 Apr 2016 10:24 PM PDT

Are there upper/lower bounds?

submitted by /u/redditless
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How fossil fuels are used to generate energy?

Posted: 09 Apr 2016 03:32 AM PDT

Why are there no freshwater cephalopods?

Posted: 09 Apr 2016 02:36 AM PDT

This question has been bugging be for a while. Plenty of other classes of animal exist in both freshwater and marine environments: fish, bivalves, crustaceans, even hydrozoans. Why are there no freshwater cephalopods? Is it possible that they exist, but we haven't seen them yet?

submitted by /u/koolatr0n
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