If a gamma ray burst were to strike earth, would the distance it originated from change its effects at all? Also, would it be possible for the burst to only effect part of the planet, say, if it struck the northern but not southern hemisphere?

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• If a gamma ray burst were to strike earth, would the distance it originated from change its effects at all? Also, would it be possible for the burst to only effect part of the planet, say, if it struck the northern but not southern hemisphere?
• Why is it that all electrons are exactly identical?
• Why is the ratio of the magnitude electric and magnetic field of a photon always equal to the speed of light?
• What caused my feet to make the sand squeak?
• How does Kirchhoff's Voltage Law apply to a closed circuit without components?
• Why do we measure time by earth specifications instead of a universal constant?
• How will a 'twisted' eyeball affect my vision?
• Is there a limit to how many times paper can be recycled before it no longer resembles paper? What is the environmental impact of all the additional resources (e.g. water, transportation to the recycling plant) needed to recycle paper versus making paper from scratch?
• What is the difference between a sine wave and trapezoid wave controller for electric motors?
• Is it possible to disconnect a power source and swap it to another without crashing the computer? How fast will this "swap" have to be?
• Where are all of these Higgs bosons?
• If I inhale different gases, like you do with helium, will my voice change?
• Can you Simplify of a²+b²?

If a gamma ray burst were to strike earth, would the distance it originated from change its effects at all? Also, would it be possible for the burst to only effect part of the planet, say, if it struck the northern but not southern hemisphere? Posted: 25 Dec 2017 03:17 PM PST submitted by /u/Carpy444 [link] [comments]

Why is it that all electrons are exactly identical? Posted: 25 Dec 2017 08:19 AM PST Same goes for protons and neutrons; they're all exact copies of each other, and this is the same throughout the entire Universe (according to our current knowledge). Don't you guys find it interesting that this is the case? What could be the reason for this? Thanks for reading and merry christmas :) submitted by /u/xXReggieXx [link] [comments]

Why is the ratio of the magnitude electric and magnetic field of a photon always equal to the speed of light? Posted: 25 Dec 2017 07:50 PM PST E/B=C I was under the impression that E=B based on diagrams like this: Electromagnetic wave Is this due to how the math works out if you apply a rotational transformation to the magnitude or am I missing something? . Edit, title should read: "Why is the ratio of the magnitude of the electric and magnetic field of a photon always equal to the speed of light." submitted by /u/Radiatin [link] [comments]

What caused my feet to make the sand squeak? Posted: 25 Dec 2017 08:23 PM PST Hello all, Here is a video of what I am asking about. I was taking a walk on the beach with my family today. We noticed that our feet and/or shoes were making squeaking sounds on the loose sand. I have been on sand tons of times and I have never noticed this noise before. I was on Bulter Beach in St. Augustine, Florida. I assume the beach location is important is finding of the sand composition. submitted by /u/najevb2 [link] [comments]

How does Kirchhoff's Voltage Law apply to a closed circuit without components? Posted: 25 Dec 2017 01:46 PM PST Hey all, so I'm trying to teach myself more about electronics for my job. I've run into a bit of a frustrating wall that's Kirchhoff's Voltage Law. I get the basics of it, that when you add the voltage and the voltage drop it equals zero. What I don't understand is why the voltage total returning to the battery must always be zero. (Correcting on my misnomer) To further elaborate I don't understand why they always equal the same and cancel each other out. If a line is too long and has too much of a voltage drop then there won't be enough voltage to create a closed circuit. That makes sense to me. What doesn't make sense is what happens if there isn't enough voltage drop and whether that is possible due to KVF. Is this for safety to not overload the circuit? Is this an observation of physics that states by the time the current has reached the end of the circuit there's no more voltage left to push it? I just don't understand why it always equals zero, even on a closed circuit with no components. I get that even the wire itself will have some negligible resistance that creates resistance, but I don't understand why the simple wire would create a voltage drop equal to the voltage. I've seen lots of math that explains it when there's components in the circuit and it makes sense to me, but I don't understand how it could possibly apply to a short circuit and no components. I would ask in the electronic subreddits but this seems to be more of a physics/observation question than an actual practical application. submitted by /u/JamesDelgado [link] [comments]

Why do we measure time by earth specifications instead of a universal constant? Posted: 25 Dec 2017 02:45 PM PST We use Earth's 1 loop around the sun for a year, but everything is relative including time. Think Interstellar.. Why not use a constant that works everywhere? Radioactive decay maybe? submitted by /u/popasmurfy [link] [comments]

How will a 'twisted' eyeball affect my vision? Posted: 25 Dec 2017 09:34 AM PST So,this might be a stupid question,but it has been in my mind for months... If one of your eyeballs turned upside down 180 degrees,what would your vision be like? Would that eye eventually adjust and have normal sight? Ps: Merry Christmas submitted by /u/DroppedPotato [link] [comments]

Is there a limit to how many times paper can be recycled before it no longer resembles paper? What is the environmental impact of all the additional resources (e.g. water, transportation to the recycling plant) needed to recycle paper versus making paper from scratch? Posted: 25 Dec 2017 07:43 AM PST This question came to me while thinking of all the gift wrapping and unwrapping that will take place today. A lot of gift wrap is now made of recycled paper and also encourages you to recycle it once it's served its purpose. But can this paper be recycled and reused indefinitely, or at some point will the original material be so broken down that you can no longer reconstitute paper from it? And even if you're not cutting down trees to make new paper, it still requires resources to recycle. So is recycling really helping the environment? Thanks and Happy Holidays. submitted by /u/Girl_with_the_Curl [link] [comments]

What is the difference between a sine wave and trapezoid wave controller for electric motors? Posted: 25 Dec 2017 01:51 PM PST Some electric motors use different controllers and I would like to know the difference beteeen them. Thanks submitted by /u/buschbaby69 [link] [comments]

Is it possible to disconnect a power source and swap it to another without crashing the computer? How fast will this "swap" have to be? Posted: 25 Dec 2017 10:16 AM PST submitted by /u/snowcroc [link] [comments]

Where are all of these Higgs bosons? Posted: 25 Dec 2017 12:27 PM PST I read that the Higgs boson is responsible for mass. Where are these Higgs bosons? Are they ubiquitous throughout space? Does matter somehow "force" them to come into existence? Is there an understanding of how many there? Is it proportional to the amount of matter? submitted by /u/mspe1960 [link] [comments]

If I inhale different gases, like you do with helium, will my voice change? Posted: 25 Dec 2017 07:30 AM PST submitted by /u/neverFoundBetterNick [link] [comments]

Can you Simplify of a²+b²? Posted: 25 Dec 2017 10:00 PM PST I know that you can use the formula to simplify a²-b²= (a-b)(a+b), but is there si formal to a²+b²? submitted by /u/ekeba8 [link] [comments]

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When there is a high load on an electrical grid, why can't we just let the frequency drop (eg 50 -> 45 Hz) and then recover later, rather then requiring rolling blackouts / load shedding?

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• When there is a high load on an electrical grid, why can't we just let the frequency drop (eg 50 -> 45 Hz) and then recover later, rather then requiring rolling blackouts / load shedding?
• Does the force of gravity travel at c?
• Could you have FTL but no time travel if your FTL could only take you to places that were in the future (or simultaneous) according to a fixed universal reference frame?
• At the airport recently I saw a design for the winglet on the end of the wing I'd never seen before - one fin up, and one down. We have had at least 60 years of jet airplane design why hasn't the optimal wing design be found already?
• What casues the wavefunction of alpha particles collapse in radioactive decay?
• The element Oganesson has the highest proton count of any element , what is stopping us from artificially adding a proton to it to see what new element we have created?
• How much does gravitational force differ in strength across the world?
• In guitar amplifiers, why are the "Presence" and "Resonance" controls on the power amp and the rest of the EQ controls (Bass, Mid, Treble) on the preamp?
• Is sugar the simplest chemical that we find sweet? Does it register sweetness to us the strongest?
• In 2004 an often quoted paper was published that claimed that the increase in 5-year survival from chemotherapy is only 2.3%. What is the current position of research on the efficiency of chemotherapy?
• Does the shape of a battery play a part in its properties?
• What kind of energy is released during a fusion reaction?
• Is it just a coincidence that the magnetic axis of the earth is parallel to the axis of rotation and also parallel to the axis of rotation around the sun?
• Why do humans not have a mating season?
• Does alcohol increase our vulnerability to stress ?
• Is a tree's photosynthetic efficiency affected by its age?
• In Antihydrogen production, how does a Minimum-B trap work?
• Can your fluid intelligence be increased/manipulated at all, or is it all genetic?
• Why do clouds always seem to sail so smoothly in the skies, even when on the ground the wind comes in irregular short gusts?

When there is a high load on an electrical grid, why can't we just let the frequency drop (eg 50 -> 45 Hz) and then recover later, rather then requiring rolling blackouts / load shedding? Posted: 25 Dec 2017 02:17 AM PST submitted by /u/746865626c617a [link] [comments]

Does the force of gravity travel at c? Posted: 24 Dec 2017 06:35 AM PST Hi, I am not sure wether this is the correct place to ask this question but here goes. Does the force of gravity travel at the speed of light? I have read some articles that we haven't confirmed this experimentally. If I understand this correctly newtonian gravity claims instant force.. So that's a no-go. Now I wonder how accurate relativistic calculations are and how much room they allow for deviations.( 99%c for example) Are we experiencing the gravity of the sun 499 seconds ago? Edit: Sorry , i did not mean the force of gravity but the gravitational waves . I am sorry if I upset some people asking this question, I am just trying to grasp the fundamental forces as we understand them. I am a technician and never enjoyed bachelor education. My apologies for my poor wording! submitted by /u/ternal38 [link] [comments]

Could you have FTL but no time travel if your FTL could only take you to places that were in the future (or simultaneous) according to a fixed universal reference frame? Posted: 24 Dec 2017 08:20 AM PST So there would be some sort of aether that, although irrelevant for any known physics, everything could be measured as moving "relative to". With the reference frame of this aether determining the "future" according to this FTL method. To break it down, 1: Is this even coherent? 2: Is there somehow still a way to do time travel even with this restriction? Or for anyone feeling particularly generous, 3: What oddities might one observe using such an FTL method in a galaxy moving quite fast relative to this special frame? submitted by /u/Othelbark [link] [comments]

At the airport recently I saw a design for the winglet on the end of the wing I'd never seen before - one fin up, and one down. We have had at least 60 years of jet airplane design why hasn't the optimal wing design be found already? Posted: 24 Dec 2017 04:36 PM PST submitted by /u/nigel_stanford [link] [comments]

What casues the wavefunction of alpha particles collapse in radioactive decay? Posted: 25 Dec 2017 03:36 AM PST As I understand alpha decay, the wavefunction of the alpha particle shows that the alpha particle has a probability to appear far enough away from the nucleus to be expelled. This probability is dependent on factors such as mass and (charge?) of the atom. However as I understand, the wavefunction of any particle is just a probability of finding any particle in a specific location upon "looking"(interacting). Why does radioactive decay occur, as I would think something needs to collapse the wavefunction so that the alpha particle can be "found" outside the nucleus of the atom. But if this is due to some interaction with other particles (inside the atom or other atoms) shouldn't the wavefunction be permanently collapsed as it is always interacting in some form of another. I most likely do not understand the wavefunction enough so any kind of help would be nice! Kind regards, Dagl submitted by /u/Dagl1 [link] [comments]

The element Oganesson has the highest proton count of any element , what is stopping us from artificially adding a proton to it to see what new element we have created? Posted: 24 Dec 2017 11:54 AM PST I know that adding new protons to an element has been done before but that it is very expensive and usually produces a radioactive element but surely it would be worth the cost and risk to see what goes beyond the Oganesson? submitted by /u/JumpyDwarf [link] [comments]

How much does gravitational force differ in strength across the world? Posted: 25 Dec 2017 03:49 AM PST submitted by /u/ShoeTIER_16 [link] [comments]

In guitar amplifiers, why are the "Presence" and "Resonance" controls on the power amp and the rest of the EQ controls (Bass, Mid, Treble) on the preamp? Posted: 24 Dec 2017 01:19 PM PST I've owned quite a few guitar amps in my day, but I've never really understood why the "super high" and "super low" frequencies are always adjusted via knobs on the power amp and not on the preamp with the rest of the EQ controls. submitted by /u/buffsop [link] [comments]

Is sugar the simplest chemical that we find sweet? Does it register sweetness to us the strongest? Posted: 24 Dec 2017 12:48 PM PST submitted by /u/DjFortune98 [link] [comments]

In 2004 an often quoted paper was published that claimed that the increase in 5-year survival from chemotherapy is only 2.3%. What is the current position of research on the efficiency of chemotherapy? Posted: 24 Dec 2017 06:53 AM PST I am referring to the below study: http://www.sciencedirect.com/science/article/pii/S0936655504002225 Abstract Aims The debate on the funding and availability of cytotoxic drugs raises questions about the contribution of curative or adjuvant cytotoxic chemotherapy to survival in adult cancer patients. Materials and methods We undertook a literature search for randomised clinical trials reporting a 5-year survival benefit attributable solely to cytotoxic chemotherapy in adult malignancies. The total number of newly diagnosed cancer patients for 22 major adult malignancies was determined from cancer registry data in Australia and from the Surveillance Epidemiology and End Results data in the USA for 1998. For each malignancy, the absolute number to benefit was the product of (a) the total number of persons with that malignancy; (b) the proportion or subgroup(s) of that malignancy showing a benefit; and (c) the percentage increase in 5-year survival due solely to cytotoxic chemotherapy. The overall contribution was the sum total of the absolute numbers showing a 5-year survival benefit expressed as a percentage of the total number for the 22 malignancies. Results The overall contribution of curative and adjuvant cytotoxic chemotherapy to 5-year survival in adults was estimated to be 2.3% in Australia and 2.1% in the USA. Conclusion As the 5-year relative survival rate for cancer in Australia is now over 60%, it is clear that cytotoxic chemotherapy only makes a minor contribution to cancer survival. To justify the continued funding and availability of drugs used in cytotoxic chemotherapy, a rigorous evaluation of the cost-effectiveness and impact on quality of life is urgently required. submitted by /u/MagnificentCat [link] [comments]

Does the shape of a battery play a part in its properties? Posted: 24 Dec 2017 12:51 PM PST i.e. lifespan or strength And is it only applicable in certain uses? submitted by /u/Atmay85 [link] [comments]

What kind of energy is released during a fusion reaction? Posted: 24 Dec 2017 03:39 PM PST When burning fossil fuels like coal or oil, we basically harvest the excess energy stored in the atomic carbon bonds compared to a co2 bond. Solar and wind work kinda different because they passively gather external energy. But what type of energy is released during a fusion reaction? I understand that the deuterium/tritium fuel „loses" a neutron in the process... so is it the binding energy of that neutron? (Basically the weak force?) But that's is just a wild guess and probably wrong. Thanks a ton in advance! Oh and sorry for the horrible english :/. submitted by /u/goersen [link] [comments]

Is it just a coincidence that the magnetic axis of the earth is parallel to the axis of rotation and also parallel to the axis of rotation around the sun? Posted: 24 Dec 2017 10:07 AM PST Aka could "north" on a compass on a different planet point to a point in that planet's equator? submitted by /u/apple1rule [link] [comments]

Why do humans not have a mating season? Posted: 24 Dec 2017 02:42 AM PST So many different species (crabs, cats, etc.) seem to have a mating season. Did we evolve to just not need it? submitted by /u/TaintedKnob [link] [comments]

Does alcohol increase our vulnerability to stress ? Posted: 24 Dec 2017 07:46 AM PST Hi everyone, I looked it up on google but I couldn't find any paper about the relationship between stress and alcohol, only papers about alcoholism. Does alcohol increase our vulnerability to stress ? Or is alcohol, when taken, makes our stress levels more important ? Thanks submitted by /u/SpaceKraken420 [link] [comments]

Is a tree's photosynthetic efficiency affected by its age? Posted: 24 Dec 2017 05:00 AM PST I am curious to know if a tree becomes more or less efficient at converting carbon dioxide into oxygen as it ages. submitted by /u/crummyvelvet [link] [comments]

In Antihydrogen production, how does a Minimum-B trap work? Posted: 24 Dec 2017 11:35 AM PST Im interested in antihydrogen production at cern, and since antihydorgen is neutral a 'minimum-B' trap is used instead of penning trap, but im having difficulty getting to grips how this actually works. suggestions for papers/books would be great. submitted by /u/PaperRopes [link] [comments]

Can your fluid intelligence be increased/manipulated at all, or is it all genetic? Posted: 24 Dec 2017 08:46 AM PST What I'm really asking is, if I can increase my crystallized intelligence as far as possible (i.e. gaining new knowledge and information) and store that information in combination with the other gathered information, would it affect my long-term fluid intelligence? Some people tell me that it would result in similar effects to studying for a test, where your fluidity would only increase in the short-term and only for what you've learned, but I'm not sure. I need the facts. submitted by /u/NilesDobbsS [link] [comments]

Why do clouds always seem to sail so smoothly in the skies, even when on the ground the wind comes in irregular short gusts? Posted: 24 Dec 2017 04:42 AM PST I know there are buildings, trees and what not on the ground, but these stay in place so I dont know if these could make the flow of air so irregular on land. submitted by /u/empire314 [link] [comments]

You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now.	Email delivery powered by Google
Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States

What did the SapceX Falcon 9 rocket launch look the way it did?

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• What did the SapceX Falcon 9 rocket launch look the way it did?
• Why are so many mathematical constants irrational?
• Does listening to audio with one ear or watching something with one eye have an effect on how the information is processed/remembered?
• How do current concepts of fusion reactors manage to have both a super-heated plasma and super-cooled magnets right next to each other?
• How can super low frequencies of electromagnet radiation (eg. radio waves) and super high frequencies of electromagnetic radiation (eg. gamma rays) pass through walls, but the frequencies in between can't?
• Does changing temperature have "inertia?"
• Why does firing clay prevent water from making it malleable again?
• When designing ultra large buildings, LIDO and LHC, do architects have to take the curvature of the Earth into account?
• When i kick a bucket of water (tranfering energy to it) and the water swirls arround. when it settles, where does the energy go? Does the water get warmer?
• Apart from Pluto being small what made them decide to change the status of the planet?
• How do cell towers send unique data streams to thousands of phones simultaneously?
• Why don't the electrons in the wires that power your household appliances get disturbed by radio waves the way electrons in an antenna do?
• How dangerous are the gravitational waves from two merging black holes if orbiting nearby?
• How much energy is there in a single nuclear rod?
• A question about Fermat's Principle of Least Time: what is the proper way to think about "what happens" when light moves to satisfy a global, rather than local, optimization problem. Do you take it as a given behavior of light, an axiom, or as something that can be further explained?
• What tests are performed to evaluate the quality of household disinfectants?
• How do websites check to see how secure your password is?
• Does empty space or a void have a temperature, and if so what would be required to raise the temperature of a void?
• What does it mean for a particle to have a charge?
• What causes the glowing bubble around Falcon 9?
• Will a positively charged object attract a neutral object?
• How would one apply shell theorem (if at all) to an incomplete shell?

What did the SapceX Falcon 9 rocket launch look the way it did? Posted: 23 Dec 2017 08:18 AM PST Why did it look like some type of cloud, is that just vapor trails or something else? (I also don't really know what flair I should add so I just put the one that makes the most sense) submitted by /u/Magikarp_used_fly [link] [comments]

Why are so many mathematical constants irrational? Posted: 23 Dec 2017 10:17 AM PST submitted by /u/guydudemanfella [link] [comments]

Does listening to audio with one ear or watching something with one eye have an effect on how the information is processed/remembered? Posted: 23 Dec 2017 12:05 PM PST submitted by /u/Quazios [link] [comments]

How do current concepts of fusion reactors manage to have both a super-heated plasma and super-cooled magnets right next to each other? Posted: 24 Dec 2017 02:34 AM PST As far as I know we wouldn't be able to fly a spaceship very close to the sun due to (among other reasons), not having the necessary technology/materials to shield against the heat properly. Then how come we can do it in a fusion reactor, on a much more extreme scale? I realize the vacuum helps, but that would be the case in space too. Meanwhile the plasma is hotter than the sun, and the magnets are cooler than the inside of a spaceship would have to be. What am I missing? submitted by /u/Drycee [link] [comments]

How can super low frequencies of electromagnet radiation (eg. radio waves) and super high frequencies of electromagnetic radiation (eg. gamma rays) pass through walls, but the frequencies in between can't? Posted: 24 Dec 2017 12:23 AM PST submitted by /u/wtiithefok [link] [comments]

Does changing temperature have "inertia?" Posted: 23 Dec 2017 08:54 PM PST When anything with mass, let's say a liter of water, changes temperature, can that change in temperature have any sort of "inertia?" For example, if I boil a liter of water, and then put it in a freezer that is exactly 0°C; does the temperature simply fall to zero, or can it build "inertia," that would cause the water's temperature to dip below zero, and then effectively "rebound" and settle at 0°C? submitted by /u/overrated_barracuda [link] [comments]

Why does firing clay prevent water from making it malleable again? Posted: 23 Dec 2017 08:01 AM PST submitted by /u/BaconConnoisseur [link] [comments]

When designing ultra large buildings, LIDO and LHC, do architects have to take the curvature of the Earth into account? Posted: 23 Dec 2017 09:19 PM PST submitted by /u/ScroteMcGoate [link] [comments]

When i kick a bucket of water (tranfering energy to it) and the water swirls arround. when it settles, where does the energy go? Does the water get warmer? Posted: 23 Dec 2017 10:36 AM PST edit: thanks to everyone! submitted by /u/overlydelicioustea [link] [comments]

Apart from Pluto being small what made them decide to change the status of the planet? Posted: 23 Dec 2017 09:32 PM PST submitted by /u/Casshern108 [link] [comments]

How do cell towers send unique data streams to thousands of phones simultaneously? Posted: 23 Dec 2017 07:20 PM PST It seems like there are too many phones in a city to use unique radio frequencies without heavy interference between signals. submitted by /u/arrowman6677 [link] [comments]

Why don't the electrons in the wires that power your household appliances get disturbed by radio waves the way electrons in an antenna do? Posted: 23 Dec 2017 11:14 AM PST What's the difference? Also I know electrons in wires "crawl" really slowly along the wire, is this the case with an antenna as well? (i always imagined electrons "sloshing" up and down the full length of an antenna, moving really fast) submitted by /u/ch1214ch [link] [comments]

How dangerous are the gravitational waves from two merging black holes if orbiting nearby? Posted: 23 Dec 2017 01:45 PM PST For example let's say a planet was orbiting two black holes that are merging (how likely a thing like this actually is besides that point but an interesting question too none the less). Would the extreme stretching and compressing of spacetime doing something akin to the Roche limit and tear this planet apart, at least temporarily? I presume the answer depends on the mass of the two black holes and the self gravity of the planet. But in general if the answer is yes being nearby two merging black holes would be extremely dangerous, could a neighboring solar system that contains life suffer a mass extinction or total extinction if their system is say 4-6 light years from the two merging black holes? Could a merging of two supermassive black holes produce gravitational waves strong enough to not only tear apart gravitationally bounded objects but also tear apart chemically bounded objects; spaghettification? submitted by /u/TIL_this_shit [link] [comments]

How much energy is there in a single nuclear rod? Posted: 23 Dec 2017 01:42 PM PST We temper the energy released in nuclear reactors with control rods, which reduces the potential energy we can use from the rods emissions, but how much potential energy do nuclear rods contain before being used in nuclear power stations? submitted by /u/myotherpresence [link] [comments]

A question about Fermat's Principle of Least Time: what is the proper way to think about "what happens" when light moves to satisfy a global, rather than local, optimization problem. Do you take it as a given behavior of light, an axiom, or as something that can be further explained? Posted: 23 Dec 2017 07:27 PM PST When introduced to the concept, I was told that the light somehow "knew" to act like this, and that we can essentially take that as a property of light, axiomatically. Then I was told that it can be explained as a consequence of Huygen's Theorem and constructive interference (although, I was never shown the explanation). Then I was told that in QED, it again is just taken as an axiom! What do you think is the most physically reasonable way to justify this apparent global-not-local character that light has? Is it really just an axiom you take as true? submitted by /u/seanziewonzie [link] [comments]

What tests are performed to evaluate the quality of household disinfectants? Posted: 23 Dec 2017 10:41 AM PST Household cleaners (Clorox, Lysol, etc) often claim to kill "99.9% of all germs." However, upon inspection, it is not immediately clear what is meant by that number. Given that it is practically impossible to test a disinfectant on every known strain of infectious agents, it stands to reason that a certain subset of infectious agents are purposefully grown and subjected to the disinfectant, and the number of live cells left after exposure quantified. It is therefore reasonable to assume that "germs" in this context refers to the tested strains. This logic leads to the following questions: Are these statements in reference to any particular standard battery of tests, or merely just ad hoc marketing statements that vary from product to product? If such standards exist, what strains comprise them? How can such standards fail? If they do not exist, how can a concerned but uneducated consumer quantitatively compare the effectiveness particular products over, say simple rubbing alcohol? TLDR: How can I know one disinfectant is more effective than another for general purpose household use? submitted by /u/PronouncedOiler [link] [comments]

How do websites check to see how secure your password is? Posted: 23 Dec 2017 09:20 PM PST On the other hand, how do programs hack into your password? Do they start off with numeric and turns into letters shouldn't "password" be a pretty safe password? submitted by /u/peterthefatman [link] [comments]

Does empty space or a void have a temperature, and if so what would be required to raise the temperature of a void? Posted: 23 Dec 2017 08:08 PM PST submitted by /u/noknots [link] [comments]

What does it mean for a particle to have a charge? Posted: 23 Dec 2017 07:41 PM PST I'm struggling a little to put this question into words, so I hope that it makes sense. I understand that a proton has +1 charge, an electron -1, &c. But what does that mean for the particle? Does that mean something beyond the repulsive effect between particles with opposite charge? submitted by /u/HickoryMountain [link] [comments]

What causes the glowing bubble around Falcon 9? Posted: 23 Dec 2017 07:26 AM PST As seen in this post: https://www.reddit.com/r/space/comments/7llwef/my_view_of_the_space_x_falcon_9_rocket_launch/ submitted by /u/ekinnee [link] [comments]

Will a positively charged object attract a neutral object? Posted: 23 Dec 2017 05:08 PM PST Imagine that you have one rod of copper and one rod of wool and you rub them against eachother, will the wool attract something like paper now? submitted by /u/Ultima_Mente [link] [comments]

How would one apply shell theorem (if at all) to an incomplete shell? Posted: 23 Dec 2017 05:01 PM PST In a typical 2-D shell theorem problem, an object outside the shell views the shell as equivalent to a point-mass, and once inside the shell the gravitational forces cancel out entirely. This got me thinking a bit about how the mechanics would change if the small gap through which the external object would enter, normally hand-waived away as being insignificant and/or virtual, was actually a legitimate structural element of the shell i.e. the shell had a small arclength removed (let's say corresponding to a small angle theta). How would this impact the interaction between the two objects? I expect the outward-facing interaction would be similar, but would the object now experience a net force within the incomplete shell? Would that force drive the object to the center of mass of the shell, and if so can that location be calculated by finding the centroid of the circular segment? https://en.wikipedia.org/wiki/Shell_theorem https://en.wikipedia.org/wiki/List_of_centroids#Centroids submitted by /u/Treephone [link] [comments]

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Google, 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States