How can everything be relative if time ticks slower the faster you go? |
- How can everything be relative if time ticks slower the faster you go?
- Is entropy low in a black hole?
- Are there any traits passed on through the Y chromosome that are not related to sex determination?
- How many more "new" stars become visible each year?
- Both ICl and Br2 have the same number of atoms and approximately the same molecular weight, but ICl is a solid whereas Br2 is a liquid at 0oC. Why?
- [Astronomy] Since black holes grow in size, shouldn't that mean there's a solid in the center of the black hole and matter is just added to it over time?
- Is there a word for something that's neither unstable nor stable?
- Are there forces on a spacecraft other than acceleration during a flyby? (Powered or unpowered)
- Is it possible to use other hadrons to catalyze nuclear reactions akin to photocatalysis of chemical reactions?
- How do photons have momentum?
- Would moving something at a high speed increase its temperature?
- Are mass and weight directly related?
- In a Neutron Generator, how is the Neutron Beam "Focused"?
- Can isotopes commonly used in food irradiation induce radioactivity through neutron activation?
- How can propellants push a spacecraft if there's nothing to push off against?
- How does Ph level affect on ice cubes?
- Are elliptical orbits any more stable than circular orbits?
- If the cooling of one object is caused by the transfer of heat to another object, how does the Earth cool in winter? Isn't space empty?
- At what temperature does a magnetic material (EX: Neodymium) lose its magnetic field?
- Why is thermodynamic equilibrium equal to maximum entropy?
| How can everything be relative if time ticks slower the faster you go? Posted: 26 Apr 2016 02:22 AM PDT When you travel in a spaceship near the speed of light, It looks like the entire universe is traveling at near-light speed towards you. Also it gets compressed. For an observer on the ground, it looks like the space ship it traveling near c, and it looks like the space ship is compressed. No problems so far However, For the observer on the ground, it looks like your clock are going slower, and for the spaceship it looks like the observer on the ground got a faster clock. then everything isnt relative. Am I wrong about the time and observer thingy, or isn't every reference point valid in the universe? [link] [comments]  |
| Is entropy low in a black hole? Posted: 26 Apr 2016 05:42 AM PDT Does it even make sense to think about entropy in black holes? [link] [comments]  |
| Are there any traits passed on through the Y chromosome that are not related to sex determination? Posted: 25 Apr 2016 01:48 PM PDT |
| How many more "new" stars become visible each year? Posted: 25 Apr 2016 02:19 PM PDT In other words, how many stars join the observable universe each year? [link] [comments]  |
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| Posted: 26 Apr 2016 06:45 AM PDT |
| Is there a word for something that's neither unstable nor stable? Posted: 25 Apr 2016 10:10 PM PDT If you stick a ball on a hill and nudge it, it will roll off the hill. It's unstable. If you stick it in a valley and nudge it, it will roll back. It's stable. If you stick it on a plane with friction, it will just move a little and stay there. It's not really either. Is there a name for that? [link] [comments]  |
| Are there forces on a spacecraft other than acceleration during a flyby? (Powered or unpowered) Posted: 26 Apr 2016 06:32 AM PDT Looking at the Oberth effect (powered flyby) and unassisted flyby, would there be any forces other than F=ma on the craft due to gravity or other issues? If periapsis was low enough, atmospheric friction would probably come into play, but are there other forces? Thanks. [link] [comments]  |
| Posted: 26 Apr 2016 06:22 AM PDT A bit of background: My quantum mechanics course was in the chemistry department and pertained specifically to interactions within electromagnetic force. Sometimes photons are used to put reactants into an excited electronic, vibrational, and even rotational state that has the lowest kinetic (as opposed to thermodynamic) barrier to reaction. This leads to faster reactions at lower temperatures. Is controlled use of other gluons akin to lasers are for photons theoretically possible, feasible, or currently done? What about the bosons that carry the weak force? [link] [comments]  |
| Posted: 26 Apr 2016 04:57 AM PDT Could someone provide the answer without pointing out Einstein's equation saying its incomplete and all? Practically, physically how is it possible for a massless object to have momentum? Analogies are appreciated. [link] [comments]  |
| Would moving something at a high speed increase its temperature? Posted: 26 Apr 2016 04:31 AM PDT Temperature is just a measure of average kinetic energy. Say, in a vacuum (where friction from air resistance is... unlikely), would moving an object extremely quickly increase the average kinetic energy of the particles in the object enough to noticeably raise its temperature? [link] [comments]  |
| Are mass and weight directly related? Posted: 25 Apr 2016 06:04 PM PDT Say you have an object, and you want it to become heavier, without changing its mass (adding external objects). Example: a handheld object for a virtual reality device, in order to achieve a more realistic experience, they controllers need to add weight. Is this somehow possible? Just a random question [link] [comments]  |
| In a Neutron Generator, how is the Neutron Beam "Focused"? Posted: 25 Apr 2016 02:44 PM PDT I understand the accelleration of a Deuterium or Tritium nucleus into a D/T target, creating fusion and the product neutrons - but how are those neutrons collected? [link] [comments]  |
| Can isotopes commonly used in food irradiation induce radioactivity through neutron activation? Posted: 26 Apr 2016 02:00 AM PDT I have two trusted sources at ends. This study: http://www.ncbi.nlm.nih.gov/pubmed/18220055 , claims that radioactivity can be induced in food by the isotopes Cobalt-60 and caesium-137, however (understanding wikipedia is not perfect) it explicitly states here: https://en.wikipedia.org/wiki/Induced_radioactivity that; "The isotopes used in food irradiation (cobalt-60, caesium-137) both have energy peaks below this cutoff and thus cannot induce radioactivity in the food". Providing the minimum required energy for this is 2 MeV for deuterium. Is wiki wrong with their MeV requirement, is this study wrong, or can you provide another answer, thanks. Sorry for the formatting, I'm still learning. [link] [comments]  |
| How can propellants push a spacecraft if there's nothing to push off against? Posted: 26 Apr 2016 12:10 AM PDT If a rocket burns fuel to accelerate in space, why does that force push the rocket if there's no atmosphere or mass to push off against? [link] [comments]  |
| How does Ph level affect on ice cubes? Posted: 25 Apr 2016 09:58 PM PDT |
| Are elliptical orbits any more stable than circular orbits? Posted: 25 Apr 2016 05:52 PM PDT I'm in an argument with another user on reddit (/u/somerandomguy02), over on /r/todayilearned. Here is the thread. /u/somerandomguy02 believes that all orbits are non-circular orbits because non-circular orbits are more stable than circular ones. I've tried my hardest to convince him otherwise, going as far as providing sources to prove that he is incorrect. I do not understand why he has any reason to believe this other than misunderstanding that the statement "elliptical orbits are stable." means that closed orbits are stable, and not that elliptical orbits are more stable. He also does not understand that circular orbits are a special subset of elliptical orbits, because circles are a special subset of ellipses, and refuses to believe the latter. I know that science is not a democracy, but I think having a large number of people verify that he is incorrect would help lead him to admit that he is incorrect, or at least believe that he is incorrect, so therefore I would greatly appreciate it if you were to confirm this. [link] [comments]  |
| Posted: 25 Apr 2016 10:26 AM PDT My icy drink is cooled because it transfers its own heat energy to the ice. How then does Earth cool, if there's no surrounding matter in space to soak up the Earth's heat energy? [link] [comments]  |
| At what temperature does a magnetic material (EX: Neodymium) lose its magnetic field? Posted: 25 Apr 2016 10:19 AM PDT And by lose, I mean to the point at which its negligible or has the same intensity as the average nonmagnetic material. [link] [comments]  |
| Why is thermodynamic equilibrium equal to maximum entropy? Posted: 25 Apr 2016 06:10 AM PDT I already asked this, but the answer got deleted so... :/ [link] [comments]  |
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