How long it will take Voyager to get to Ninth Planet? |
- How long it will take Voyager to get to Ninth Planet?
- How is this paradox involving basic relativity principles explained?
- Can we be sure the laws of physics hold everywhere in the universe?
- Why is the area around where a laser has been pointed, really blurry?
- What are symmetries?
- How do phospholipid bilayers interact with lipid micelles like soap?
- I've come up with a way to "prove" (Please note the quotation marks) that 1/0 = Aleph Null. Can anyone explain where the error(s) is?
- It is known that charge is always associated with mass & mass can converted into energy as E=mc2 then why do we say that charge is conserved ?
- Planet IX Megathread
- What is the Heisenberg Uncertainty Principle?
- Is there a 5th dimension? If so what is it?
- Just as glass allows visible light (390 to 700 nm) to pass through it, do any other materials allow only a specific range of the electromagnetic spectrum to pass through it?
- I have always wondered why don't we send anything to gas giants in our solar system?
- Have the locations and movements of black holes ever been tracked or mapped?
- Why is NaCl used for icy roads when its enthalpy of solution is about +3.9 kJ mol-1?
- If I have a coin and want to prove there is a 50/50 chance for it to land either heads or tails, how many times do I need to flip it?
- Inputting "1.6*10^13 m/s" into WolframAlpha shows that the "upper limit on the speed of quantum information" is 54000 c. What is this about?
- Are there any primes or classes of primes, for example large Mersenne primes, which are not normal numbers?
- Why do deep sea fish have such odd features such as transparency and bioluminescence?
- Does special relativity preclude multiple time dimensions?
- Why does cream/milk make coffee lighter, but sugar doesnt?
- Why does the sound from rocket launches tend to change suddenly at a certain altitude?
- About the 7 base SI units: "7 is the number of physical quantities that are independent from one another. It comes from the fact that the number of quantities in physics is higher by 7 to the number of determination equations (definition equations and natural laws)." -- Can someone explain this?
- Is it possible to have a satellite orbit earth but keep its camera focused on Mars, without using active controls?
- If you had one molecule of water, how would you determine its state?
| How long it will take Voyager to get to Ninth Planet? Posted: 22 Jan 2016 05:35 AM PST Eventually is there any possibility to shoot probe like Voyager in future? [link] [64 comments]  |
| How is this paradox involving basic relativity principles explained? Posted: 22 Jan 2016 06:05 AM PST Relativity is a confusing and counter-intuitive concept to the layman, and many people only ever know that there is something called "time dilatation" and "length contration" happening, without fully comprehending (myself included). With this limited knowledge it's possible to construct paradoxes, one of which is the following:
Hope someone can explain it in a layman-friendly way (if in any way possible) :D And please, for the love of god, do not comment on how it's impossible for a train to be this fast, to close doors immediately, for a door to be completely impenetrable, etc. It's a gedankenexperiment and not the point of this post. [link] [18 comments]  |
| Can we be sure the laws of physics hold everywhere in the universe? Posted: 22 Jan 2016 03:50 AM PST |
| Why is the area around where a laser has been pointed, really blurry? Posted: 21 Jan 2016 06:36 AM PST I've been doing an experiment (Young's double slit experiment) and it deals with lasers. Whenever I point the laser at something, I have noticed this kind of small, red dots surrounding the point, making the region real blurred. Why does this happen? EDIT :- Holy crap, this post blew up! Thanks for all your answers guys, really appreciate it. [link] [107 comments]  |
| Posted: 22 Jan 2016 05:56 AM PST |
| How do phospholipid bilayers interact with lipid micelles like soap? Posted: 21 Jan 2016 06:53 PM PST Hello all. I've been doing some research on mechanisms of transfection, one of which is lipofection. I was wondering what soap miscelles would do to the phospholipid bilayer (cell membrane) of a cell, and, if possible, why? [link] [4 comments]  |
| Posted: 22 Jan 2016 01:57 AM PST First of all, the sum of a convergent infinite series is a/(1-x) with a being the first term in the series and x being the multiplier that terms successively multiply by, e.g. a + ax1 + ax2 + ... So, if we do 1+1+1+1+..., a is 1 and so is x, therefore we get 1/1-1, which is 1/0, therefore 1+1+1+1+... = 1/0 Since 1/0 is obviously undefined, this has to be wrong, but I don't see the problem. Can anyone please point out the error for me? Thanks if you do. [link] [6 comments]  |
| Posted: 22 Jan 2016 04:15 AM PST |
| Posted: 20 Jan 2016 03:22 PM PST We're getting lots of questions on the latest report of evidence for a ninth planet by K. Batygin and M. Brown released today in Astronomical Journal. If you've got questions, ask away! [link] [2417 comments]  |
| What is the Heisenberg Uncertainty Principle? Posted: 21 Jan 2016 11:03 AM PST I am an aspiring physicist but currently have little to no professional education in the subject (high school freshman). I have been trying to learn whatever I can outside of school, and I feel I know a bit about quantum mechanics from lectures by Lawrence Krauss, videos online, etc. Can someone explain what the Heisenberg Uncertainty Principle is? What does it govern on the quantum scale? [link] [35 comments]  |
| Is there a 5th dimension? If so what is it? Posted: 21 Jan 2016 05:49 PM PST |
| Posted: 22 Jan 2016 06:21 AM PST |
| I have always wondered why don't we send anything to gas giants in our solar system? Posted: 21 Jan 2016 08:02 AM PST Are the conditions too extreme for another "curiosity" to land and explore, or do we just not know can you even land there. How about something that hits the orbit and stays there observing the planet like a satellites that observe the earth? I know the answer must be simple, but I've never heard anyone explaining this. [link] [110 comments]  |
| Have the locations and movements of black holes ever been tracked or mapped? Posted: 21 Jan 2016 06:54 AM PST I am curious if known locations and movements of black holes have ever been mapped or graphed to see if there are any interesting finds about their whereabouts. [link] [16 comments]  |
| Why is NaCl used for icy roads when its enthalpy of solution is about +3.9 kJ mol-1? Posted: 22 Jan 2016 01:32 AM PST Would this not make NaCl lower the temperature of its surroundings? What is really happening here? [link] [1 comment]  |
| Posted: 22 Jan 2016 06:53 AM PST |
| Posted: 22 Jan 2016 05:51 AM PST Here is what I'm talking about. What does this mean exactly? [link] [1 comment]  |
| Posted: 21 Jan 2016 06:21 PM PST By "normal number" I mean https://en.wikipedia.org/wiki/Normal_number. [link] [4 comments]  |
| Why do deep sea fish have such odd features such as transparency and bioluminescence? Posted: 21 Jan 2016 06:34 AM PST Why did evolution decide that these fish should have eyes that look up directly out of their transparent heads, for example? [link] [9 comments]  |
| Does special relativity preclude multiple time dimensions? Posted: 21 Jan 2016 05:07 PM PST Could objects have multiple futures and multiple pasts? I was just wondering if anything in special relativity actually precludes this from being the case. I realize that even if not, it is still an unfalsifiable position for now. [link] [9 comments]  |
| Why does cream/milk make coffee lighter, but sugar doesnt? Posted: 22 Jan 2016 03:43 AM PST |
| Why does the sound from rocket launches tend to change suddenly at a certain altitude? Posted: 21 Jan 2016 06:43 AM PST After watching numerous videos of rocket launches, from huge launches like the Space Shuttle or Saturn V, to big rockets like the Delta IV or Titan IV, to smaller rockets like the Atlas V, I've noticed something about the sound of the launch that is the same in almost every single video. At first the sound begins as a deep roar. As the rocket rises, the sound begins to "destabilize", and at a certain altitude the sound very suddenly becomes significantly more thunderous and crackly. I am aware of where the crackling noise itself comes from, but I've never quite understood exactly why the sound evolves the way it does. Does it have something to do with how the jet is aimed at the microphone? Or does it involve the sound having less interaction with the ground as the rocket rises? Or perhaps the decrease in atmospheric density with altitude changes the sound of the jet? All of these? None of them? I'm really quite curious about this, because it seems so universal. Here are some examples of what I am talking about: Apollo 11 Tracking Camera The sound starts off as a deep roar and begins crackling very suddenly at 36 seconds in. STS-92 Launch The sound from the solid rocket boosters arrives at 9:20, and becomes significantly more ferocious at 9:31. Last Titan IV Launch The sound from the boosters arrives at around 20 seconds and becomes much more prominent at 40 seconds. The people present comment on it. Orion EFT-1 Delta IV Heavy The sound begins with a rather ominous "Vwoomp", then continues rumbling heavily before very suddenly transitioning to a crackling noise at around 1:00. These are only a few examples, but like I said, I've seen the same thing in practically every launch video I've ever watched. [link] [10 comments]  |
| Posted: 21 Jan 2016 08:42 AM PST Side question: How is the Candela Cd not kg m2 s-3, since it is a measure of luminous power (W) per solid angle (dimensionless)? Edit: Thank for the insightful inputs. I took that course for granted, but after going through the lectures again, and having passed the exam, I am now fully convinced that these guys have absolutely no idea what they are talking about. I did learn a lot from you guys so thanks again. [link] [12 comments]  |
| Posted: 21 Jan 2016 10:48 PM PST I.e. a specific angular velocity, attitude, and orbit that would allow this. Is there only one unique solution? [link] [7 comments]  |
| If you had one molecule of water, how would you determine its state? Posted: 21 Jan 2016 04:51 AM PST I guess if you had it in a vacuum, it'd have to be a gas, right? Because of the pressure. But let's say it's at an unknown temperature and pressure and there is no other matter around for it to interact with (like air). Is it a solid, liquid, or gas, and how do you tell? [link] [16 comments]  |
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