If a spacecraft travelling at relativistic speed is fitted with a beacon that transmits every 1 second would we on earth get the signal every second or would it space out the faster the craft went?

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• If a spacecraft travelling at relativistic speed is fitted with a beacon that transmits every 1 second would we on earth get the signal every second or would it space out the faster the craft went?
• Why is helium still a liquid at 0K?
• Why is "that was just the initial condition" not considered as an answer to the horizon problem?
• I understand why different atoms have different absorption spectrum, but why does a given atom have several "peaks" in its spectrum?
• What wavelength of electromagnetic radiation is given off by iron just due to normal impacts of room-temperature air molecules?
• How much faster could time go by compared to time on Earth?
• Why metals are crystalline and not amorphous?
• Is it possible to determine what is truly stationary?
• Is there a theoretical relationship between superconductivity and gravity?
• Is evaporative cooling more efficient in a deep pool or a shallow pool?
• What evidence do we have for cosmological inflation other than it had to have happened?
• Why do some animals mate for life, and how does it benefit their survival?
• Do the conditions where the speed of light is constant exist in the real universe?
• Is there a distance from the sun, in which the temperatures in space will be similar to the temperatures on Earth?
• [Engineering] Why has no one made an engine where the cylinders are of varying sizes?
• Does it get significantly harder to heat water another degree as temps go up?
• do matter and anti matter attract?
• Are certain equations "harder" for a calculator to solve?
• After crossing over in meiosis, are the chromosome chromatids still considered sister chromatids?
• How do we know the chemical composition of compounds? (e.g. H2O, CO2)
• "Faster-than-light particles, if they existed, could be used to communicate backwards in time". How is this true?

If a spacecraft travelling at relativistic speed is fitted with a beacon that transmits every 1 second would we on earth get the signal every second or would it space out the faster the craft went? Posted: 27 Mar 2016 07:20 AM PDT submitted by /u/mrstimp [link] [comments]

Why is helium still a liquid at 0K? Posted: 27 Mar 2016 05:55 PM PDT submitted by /u/FlyinPurplePartyPony [link] [comments]

Why is "that was just the initial condition" not considered as an answer to the horizon problem? Posted: 27 Mar 2016 05:18 PM PDT [Physics] I understand the problem is that the cmb is uniform and that implies that the early universe mixed, but did it have to mix? Couldn't it have just started off uniform? submitted by /u/grkirchhoff [link] [comments]

I understand why different atoms have different absorption spectrum, but why does a given atom have several "peaks" in its spectrum? Posted: 27 Mar 2016 09:37 PM PDT I would assume it's because each electron will give off a different amount of energy. But hydrogen only has one electron, and it has 5 peaks (at least in the visible spectrum, don't know if it has some elsewhere) so I suppose that's busted. Anyone care to explain? submitted by /u/Night_Thastus [link] [comments]

What wavelength of electromagnetic radiation is given off by iron just due to normal impacts of room-temperature air molecules? Posted: 27 Mar 2016 09:25 PM PDT Essentially, the iron in this example (and literally everything else) is constantly giving off electromagnetic radiation, right? But since it's absorbing so little energy from the room-temperature air it should be really low wavelength, and thus certainly not in the visible spectrum. But I'm wondering what wavelength it is emitting? Is it radio waves? Microwaves? ULF? SLF? ELF? Thanks in advance! submitted by /u/Night_Thastus [link] [comments]

How much faster could time go by compared to time on Earth? Posted: 27 Mar 2016 07:14 PM PDT I know that thanks to time dilation, time goes faster with less gravity. So how fast could it get compared to time on Earth? For example, is there a spot in the universe with such little gravity that I could live for a hundred years while only a year has gone by on Earth? submitted by /u/saleemkarim [link] [comments]

Why metals are crystalline and not amorphous? Posted: 27 Mar 2016 07:32 AM PDT Gibbs free energy equation : G = H - TS, H: Enthalpy T: absolute temperature S: Entropy, Since an amorphous structure has more entropy than a crystalline structure, which should reduce the Gibbs free energy, so why most solids exist in a crystalline state and not amorphous ? submitted by /u/PureImmortal [link] [comments]

Is it possible to determine what is truly stationary? Posted: 27 Mar 2016 06:10 PM PDT We tend to think of motion within a frame of reference, however the speed of light being a universal constant is in reference to the universe. To me this raises the question, could we in theorey use this fact to determine the speed and direction that the earth is moving through the universe and thereby determine what is truly stationary in reference to the universe? As a thought experiment, if you had a light source surrounded by detectors spaced eqidistantly from the source and the light source emitted a single photon towards each detector simultaneously could you determine the speed and direction at which the experiment was traveling through the universe using the slight variation in the time it took the photons traveling different directions to reach their detectors? submitted by /u/ragingfailure [link] [comments]

Is there a theoretical relationship between superconductivity and gravity? Posted: 27 Mar 2016 11:27 AM PDT submitted by /u/eetbeaf [link] [comments]

Is evaporative cooling more efficient in a deep pool or a shallow pool? Posted: 27 Mar 2016 10:50 AM PDT Interested in how shape of water volume affects evaporative cooling. Additional question would be something like: what shape would be most efficient if water was being cooled solely by evaporative cooling? Thanks in advance! submitted by /u/pearthon [link] [comments]

What evidence do we have for cosmological inflation other than it had to have happened? Posted: 27 Mar 2016 06:00 PM PDT submitted by /u/YTsetsekos [link] [comments]

Why do some animals mate for life, and how does it benefit their survival? Posted: 27 Mar 2016 10:08 AM PDT submitted by /u/jamieluke [link] [comments]

Do the conditions where the speed of light is constant exist in the real universe? Posted: 27 Mar 2016 01:38 PM PDT The speed of light can be affected by gravity and a host of other variables including (presumably) the effects of Dark Matter submitted by /u/M_Dom [link] [comments]

Is there a distance from the sun, in which the temperatures in space will be similar to the temperatures on Earth? Posted: 27 Mar 2016 08:19 PM PDT submitted by /u/OatmealWarrior [link] [comments]

[Engineering] Why has no one made an engine where the cylinders are of varying sizes? Posted: 27 Mar 2016 11:11 AM PDT It could be 6 cylinders in a line, with the closest one being the largest and then the cylinders getting progressively smaller. Would this not reduce fuel consumption due to less volume displacement? submitted by /u/Harcsas [link] [comments]

Does it get significantly harder to heat water another degree as temps go up? Posted: 27 Mar 2016 12:01 PM PDT So say I put a pot of water on the range. If it takes x amount of time to heat up from 50 to 60 will it also take x amount to go form 60 to 70? Or does it get harder to heat up as it goes up? submitted by /u/samlir [link] [comments]

do matter and anti matter attract? Posted: 27 Mar 2016 04:31 PM PDT So a particle and an anti particle of any type have opposite characteristics, correct? (like how an electron has a negative charge and a positron has a positive charge) So if matter attracts other matter, then anti matter would detract(is that a word?) other matter. But I thought that opposites always attract, don't they? or does the gravitational force of opposite particles not apply in this situation. Questions simplified: all opposite particles are the negative of each other correct? does antimatter push matter away then? if it is true that antimatter pushes away other matter is that the theory of why the universe is still expanding and not slowing down? in this situation if antimatter does push away, does matter and antimatter coming together disregard this force? submitted by /u/JACKTEO98 [link] [comments]

Are certain equations "harder" for a calculator to solve? Posted: 27 Mar 2016 08:21 AM PDT Does a simple operation take less time or computing space than a complicated operation? submitted by /u/EliTheRussianSpy [link] [comments]

After crossing over in meiosis, are the chromosome chromatids still considered sister chromatids? Posted: 27 Mar 2016 10:41 AM PDT Like since they are no longer identical after crossing over would thy no longer be sister chromatids and identical? submitted by /u/CeciliaMemorabilia [link] [comments]

How do we know the chemical composition of compounds? (e.g. H2O, CO2) Posted: 27 Mar 2016 04:28 AM PDT submitted by /u/ThePlatinumPenguinHD [link] [comments]

"Faster-than-light particles, if they existed, could be used to communicate backwards in time". How is this true? Posted: 27 Mar 2016 05:00 AM PDT I have a problem with this and maybe someone is able to explain why it is true. Why can we send information backwards in time using faster-than-light particles? The information will arrive faster than the light, that's all. How is this "backwards in time"? I just don't get it. Is time considered to be connected somehow with the speed of light? submitted by /u/Caydenz [link] [comments]

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Why can the Golden Ratio be found all over nature?

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• Why can the Golden Ratio be found all over nature?
• What causes the stinging sensation when you get soap in the eyes?
• Why do Uranus's rings and moons orbit 90 degrees to the sun too?
• Would a sand timer still work the same if the sand grains were boulder-sized and the timer was proportionally larger?
• This BB exits a bubble as soon as the bubble is completely popped. Is there a reason behind this, or just a coincidence?
• When light is slowed by something such as travelling through a medium like water, how does it speed back up when it exits? Wouldn't it require some external energy in order to speed back up?
• Do people who have lost limbs need to eat less?
• Why is a mylar blanket (first-aid blanket) effective against hypothermia/heat loss?
• Since the Earth moves in an ellipse around the sun. How significant is the centrifugal force?
• What are the physics behind an electron microscope that allow it to work?
• How do primatogolists/anthropologists/zoologists like Jane Goodall interact safely with aggressive chimps?
• Why don't the protons in the nucleus of an atom don't repel each other since they have a positive charge?
• How does a revolver cannon align the chamber with the barrel, and yet spin at a high rate? Won't there be potentially fatal issues with alignment?
• What did chemists use before magnetic stir bars?
• When I hear a jet engine, what's actually making the various sounds?
• Why is Xenon so much more reactive than the other noble gasses?
• If the expansion of the universe is supported by cosmic microwave background radiation, how can the universe be expanding exponentially?
• If octopi are entirely soft-bodied all the way through; where do their muscles anchor that they can still pull and push with their arms?
• If I release the gas pedal on a car while moving, only braking on the gears, would the car use any fuel?
• [Astronomy]Is it possible to have an orbit around the earth and the moon?
• Is it necessary for all theories of physics to have an axiomatic mathematical system to build upon?

Why can the Golden Ratio be found all over nature? Posted: 26 Mar 2016 07:26 AM PDT I've been looking into the golden ratio( fibonacci sequence) and I'm curious why it shows up in nature in many different places. Why does a geometric ratio play such importance that it withstood evolution? Edit: Thanks reddit for collectively taking my Front Page V-card. What are some applications of the golden ratio not related to biology and nature? Some people stated that the golden ratio in design it is a good starting point, i've used it for its convergence properties. Any others? submitted by /u/xalltime [link] [comments]

What causes the stinging sensation when you get soap in the eyes? Posted: 26 Mar 2016 09:04 PM PDT I'm curious about the mechanism - how do detergent molecules (or other components of soap) trigger a pain response? And in the case of baby shampoo and similar substances, how do they avoid triggering this response? submitted by /u/superhelical [link] [comments]

Why do Uranus's rings and moons orbit 90 degrees to the sun too? Posted: 26 Mar 2016 07:08 AM PDT submitted by /u/Davidhasahead [link] [comments]

Would a sand timer still work the same if the sand grains were boulder-sized and the timer was proportionally larger? Posted: 26 Mar 2016 05:51 PM PDT submitted by /u/rroach [link] [comments]

This BB exits a bubble as soon as the bubble is completely popped. Is there a reason behind this, or just a coincidence? Posted: 26 Mar 2016 11:35 PM PDT I saw this gif on another sub. Couldn't help but notice that the BB pellet exits the bubble as soon as it is fully popped. Is this just a coincidence, or something more? submitted by /u/Choppedporks01 [link] [comments]

When light is slowed by something such as travelling through a medium like water, how does it speed back up when it exits? Wouldn't it require some external energy in order to speed back up? Posted: 26 Mar 2016 02:13 PM PDT submitted by /u/kris860 [link] [comments]

Do people who have lost limbs need to eat less? Posted: 26 Mar 2016 11:35 AM PDT Assume a person is sedentary before and after their loss of limb. I would assume that they need to eat much less after, because there is less total body mass that they have to maintain. If this is true: How much less do they need, calorie-wise? If you lose both legs (let's call it ~20% of your total body mass) - do you need to take in ~20% less calories? Long-term - do their bodies "know" they need less food, or do they still feel the impulse to eat the same amount as before? Do nutritional needs change after a limb loss? (As a lower percentage of your body is muscle tissue, and a higher percentage is organs) If this isn't true: Why? submitted by /u/Dog_Knees [link] [comments]

Why is a mylar blanket (first-aid blanket) effective against hypothermia/heat loss? Posted: 26 Mar 2016 03:07 PM PDT How can something so thin and flimsy be so good at keeping heat where it is? submitted by /u/mutt1917 [link] [comments]

Since the Earth moves in an ellipse around the sun. How significant is the centrifugal force? Posted: 26 Mar 2016 10:48 PM PDT submitted by /u/whatsmyPW [link] [comments]

What are the physics behind an electron microscope that allow it to work? Posted: 26 Mar 2016 02:08 PM PDT I know that it uses a beam of electrons that somehow allow it to compile an image. And since the wavelength of electrons is much shorter than visible light the microscope will have a higher resolving power and be able to see more detail. But I'm wondering what the actual physics are at work, and how the microscope compiles them together. This is my first post so I'm sorry if it is unclear! Fell free to ask for clarification if I wasn't! submitted by /u/Jewberry_pie [link] [comments]

How do primatogolists/anthropologists/zoologists like Jane Goodall interact safely with aggressive chimps? Posted: 26 Mar 2016 03:20 AM PDT submitted by /u/GaoFooShwai [link] [comments]

Why don't the protons in the nucleus of an atom don't repel each other since they have a positive charge? Posted: 26 Mar 2016 01:10 PM PDT submitted by /u/TheMastr21 [link] [comments]

How does a revolver cannon align the chamber with the barrel, and yet spin at a high rate? Won't there be potentially fatal issues with alignment? Posted: 26 Mar 2016 04:08 AM PDT Hi! I'm very curious about firearms and mechanisms, even though I'm not an engineer, and I'd really appreciate any help with my understanding how these things work. In a Gatling gun, each barrel has its own chamber, so you don't have to worry about making sure the cartridge is aligned with the barrel before firing it- the entire assembly is being rotated. In a revolver handgun, the cylinder stops moving before each cartridge is fired, which means you could design a mechanism to lock and align each chamber with the barrel, avoiding alignment problems. However, in a revolver cannon, I see problems with either approach. If you stop the cylinder and lock it before firing each cartridge, you run into the problem of accelerating and stopping a pretty heavy cylinder repeatedly (in the order of thousands of rounds a minute), which I imagine puts immense strain on the locking mechanism, and wastes a lot of energy in applying such high opposite accelerations. On the other hand, if you keep the cylinder spinning continuously, won't misalignment be a very big risk or problem? A misfire would wreck the entire mechanism and possibly kill your crew. Also, would the momentum of the round cause asymmetrical strain on the barrel, since relative to the barrel, the round is moving to the side while it's being fired? Thanks for reading through all this! submitted by /u/whythecynic [link] [comments]

What did chemists use before magnetic stir bars? Posted: 26 Mar 2016 02:27 AM PDT I always wondered if there was some old device used to stir solutions that took a while to dissolve into complete solution. Or did the chemist just have to sit there stirring manually until the job was done? submitted by /u/AltrdFate [link] [comments]

When I hear a jet engine, what's actually making the various sounds? Posted: 26 Mar 2016 03:28 AM PDT submitted by /u/BedWedOrBehead [link] [comments]

Why is Xenon so much more reactive than the other noble gasses? Posted: 26 Mar 2016 03:22 AM PDT submitted by /u/fofbacon [link] [comments]

If the expansion of the universe is supported by cosmic microwave background radiation, how can the universe be expanding exponentially? Posted: 26 Mar 2016 04:57 AM PDT I've been told that background radiation supports the expansion of the universe, but if the universe is expanding exponentially, how can the linear volume-temperature relation hold true? Sorry for the poorly worded question, I'm still trying to work it out in my head. submitted by /u/DJ_Enchilada [link] [comments]

If octopi are entirely soft-bodied all the way through; where do their muscles anchor that they can still pull and push with their arms? Posted: 25 Mar 2016 09:32 PM PDT submitted by /u/Suck_A_Turd [link] [comments]

If I release the gas pedal on a car while moving, only braking on the gears, would the car use any fuel? Posted: 26 Mar 2016 01:39 AM PDT If I press down the clutch as well I understand it will, because the engine consume some fuel to keep it idle, but if it is braking on the gears wouldn't it be the wheels that kept the engine running? On newer cars with a real-time fuel consumtion display it would show 0.0 liters/100 km, but is this because the newer cars "know" it doesn't need fuel, or would it apply to older cars as well? Sorry if the question was badly phrased, english is not my main language. submitted by /u/Brainix112 [link] [comments]

[Astronomy]Is it possible to have an orbit around the earth and the moon? Posted: 26 Mar 2016 08:19 AM PDT submitted by /u/Sharukh77 [link] [comments]

Is it necessary for all theories of physics to have an axiomatic mathematical system to build upon? Posted: 26 Mar 2016 11:43 AM PDT I wonder wether some kind of Gödels incompletness theorems apply also to systems of physics. submitted by /u/paschep [link] [comments]

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If water has a boiling point of ~100 degrees C, why does it evaporate at room temperature?

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• If water has a boiling point of ~100 degrees C, why does it evaporate at room temperature?
• Would single stage rockets be achievable on Mars?
• Theoretically, how many bits of information make up our universe?
• Why are electrical monopoles possible but magnetic and gravitational ones aren't?
• Can the spot of a laser pointer move faster than light?
• if fusion in stars that go supernovae stops at iron, from where did we get heavier elements here on earth??
• If I randomly 'observe' a photon (I sometimes do, sometimes not) and then run a double slit experiment will I be able to determine if the photon has been observed or not by whether it forms an interference pattern?
• Does the effectiveness of evaporative cooling decrease as the surrounding temperature increases?
• Now that we can detect gravitational waves, will there be events we can observe through both gravity and regular astronomy?

If water has a boiling point of ~100 degrees C, why does it evaporate at room temperature? Posted: 25 Mar 2016 09:10 AM PDT submitted by /u/mrgreencannabis [link] [comments]

Would single stage rockets be achievable on Mars? Posted: 25 Mar 2016 08:36 PM PDT With its decreased gravity would single stage rockets that go from the Martian surface to Martian orbit or even interplanetary space be achievable with already existing technology? submitted by /u/READERmii [link] [comments]

Theoretically, how many bits of information make up our universe? Posted: 25 Mar 2016 07:28 PM PDT I was wondering about this in relation to a simulation. If there was a simulation on the scale of our universe, something as complex and as large, in terms of actual bits, how many would this simulation have/need? I dont know if this is the proper way to put this question, but hopefully someone understand. Is this is even possible to estimate? Thanks! submitted by /u/Read_or_bleed [link] [comments]

Why are electrical monopoles possible but magnetic and gravitational ones aren't? Posted: 25 Mar 2016 08:44 AM PDT Specifically, in simple terms, what is it about the mathematics of the Maxwell equations that says a positive or negative charge can exist but a magnetic one can't? Is there similar maths that says why gravitational monopoles don't exist? submitted by /u/thecuriousscientist [link] [comments]

Can the spot of a laser pointer move faster than light? Posted: 26 Mar 2016 06:58 AM PDT Assuming I am standing far enough from a very long wall and have a strong laser pointer, I can make the dot of the laser pointer move fairly quickly. Is there anything stopping me from moving the dot faster than the speed of light? submitted by /u/PrimeMower [link] [comments]

if fusion in stars that go supernovae stops at iron, from where did we get heavier elements here on earth?? Posted: 25 Mar 2016 01:03 PM PDT I mean really heavier elements like uranium.. submitted by /u/Moon_ire [link] [comments]

If I randomly 'observe' a photon (I sometimes do, sometimes not) and then run a double slit experiment will I be able to determine if the photon has been observed or not by whether it forms an interference pattern? Posted: 25 Mar 2016 08:46 AM PDT I am quite new to quantum mechanics and this bit just baffles me and I feel that I am misunderstanding this concept in the double slit experiment. Any help would be appreciated! :) submitted by /u/pokuit [link] [comments]

Does the effectiveness of evaporative cooling decrease as the surrounding temperature increases? Posted: 25 Mar 2016 07:07 PM PDT I understand that when we sweat, the sweat evaporating off of our skin cools us down. However, if the surrounding temperature increases, wouldn't the water take less energy from your skin, and more from the hot air around you? Wouldn't that make it take less energy and cool you down less? submitted by /u/Amvizzy [link] [comments]

Now that we can detect gravitational waves, will there be events we can observe through both gravity and regular astronomy? Posted: 25 Mar 2016 11:55 AM PDT submitted by /u/someone_entirely_new [link] [comments]

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