Why is String Theory a "Theory"? In science, doesn't "Theory" mean something tested with reproducible results? |
- Why is String Theory a "Theory"? In science, doesn't "Theory" mean something tested with reproducible results?
- If I was on a train that was going 20 mph, and I began walking toward the front of the train at 5 mph, am I now going 25 mph?
- Do renewable energy sources produce enough energy to offset the energy cost of producing them?
- Do, or rather, can animals choose whether or not they want offspring?
- What does time dilation look like to an observer outside its area of effect?
- Is there an escape velocity for leaving the solar system?
- Why when i fill up my glass with very hot water from the tap it looks cloudy for a few seconds before turning clearer, whereas water from the tap that's cold is clear from the start?
- Why Don't Black Holes Have a Corona?
- How does the deep ocean water stay oxygenated?
- How is hydrogen stored in the sun?
- If ^2 is squared, and ^3 is cubed, what is ^4 called and so on?
- What happens after a black hole?
- Does tectonic activity contribute to sea level changes?
- How do radio stations know how many listeners they have?
- Would the Monty Hall problem/paradox be affected by an outsider?
- Is there a limit to how dark I can make my tea?
- Why couldn't we accelerate a particle of metal to faster-than-light using magnets?
- Is there a situation where the coefficient of static friction is less than the coefficient of kinetic friction?
- Is there a limit to how big planets can potentially be?
- How much air would it take to form a self-gravitating sphere of gas with a central pressure of 1 atm?
- Is it possible to take an image/video of a live water bear(tardigrade)?
- Why do carbohydrates cyclize with the chiral carbon furthest away?
| Posted: 02 Nov 2015 03:31 PM PST Shouldn't it be the String Hypothesis? Similarly, why is the branch of physics called "Theoretical" Physics. Shouldn't it be Hypothetical Physics? [link] [272 comments]  |
| Posted: 02 Nov 2015 11:33 AM PST The example can be switched and isn't the only one but, my friend and I were having a debate on something similar to this. It was sparked by him mentioning that his high school science teacher said that you cannot move faster than the vehicle you are in. I told him this was true, and obviously he disagreed. While I'm not a physicist, some of you probably are and could surely help with this debate. So please with some science and formulas give me strength! :] Thanks for any help! EDIT: Holy smokes, this actually went somewhere! Thank you guys, and gals, for all the different explanations. Now, who do you guys think is correct in this situation? ;] [link] [211 comments]  |
| Do renewable energy sources produce enough energy to offset the energy cost of producing them? Posted: 02 Nov 2015 07:57 AM PST A number of people have tried to tell me that renewable energy sources (a windmill for example) will never produce more energy than it took to create them. Is this true? If not, where does this claim come from? [link] [153 comments]  |
| Do, or rather, can animals choose whether or not they want offspring? Posted: 02 Nov 2015 04:43 PM PST Do some animals reject mates for life and remain celibate out of choice? [link] [12 comments]  |
| What does time dilation look like to an observer outside its area of effect? Posted: 03 Nov 2015 04:12 AM PST I don't know whether this belongs here, or on /r/shittyaskscience So I was thinking about Interstellar (the movie) and was thinking about the scene where Cooper and the others go to Mann's world (big waves). According to the movie and their take on the relativity, on this planet, 1 hour is equivalent to 7 earth years. Now, Romilly stayed on the ship around the planet's orbit, and as such was not affected by the planets gravity and relativity etc. My question is, if Romilly was looking out of a window on his ship, and had a view of Cooper's team entering the planet, would there be some point, where Cooper's ship would suddenly appear to either severely decelerate/come to a stop; appearing motionless in space, due to the change in space/time caused by relativity? I am basing this query on the assumption that Rommily has constant vision of Cooper's ship (negating the fact that he would actually be moving in orbit, for the sake of argument) [link] [2 comments]  |
| Is there an escape velocity for leaving the solar system? Posted: 02 Nov 2015 11:04 PM PST Would an object need to travel faster than a particular velocity in order to leave the suns orbit? Or do I have the concept of escape velocity completely wrong? [link] [9 comments]  |
| Posted: 02 Nov 2015 12:33 PM PST |
| Why Don't Black Holes Have a Corona? Posted: 02 Nov 2015 09:37 PM PST |
| How does the deep ocean water stay oxygenated? Posted: 02 Nov 2015 03:25 PM PST I understand how a little might reach it from the surface depending on currents. But there's a lot of freaking water to oxygenate. And there's lots of animal life down there that require it. [link] [4 comments]  |
| How is hydrogen stored in the sun? Posted: 02 Nov 2015 04:05 PM PST Basically what im asking is how un-fused hydrogen is kept in the sun without it just being fused immediately. Is there a max amount of hydrogen that can be fused at a time? [link] [8 comments]  |
| If ^2 is squared, and ^3 is cubed, what is ^4 called and so on? Posted: 03 Nov 2015 04:52 AM PST |
| What happens after a black hole? Posted: 02 Nov 2015 10:21 PM PST So, eventually Hawking's radiation would cause the black hole to lose all its energy, right? What then? Would we finally see that elusive singularity? [link] [10 comments]  |
| Does tectonic activity contribute to sea level changes? Posted: 02 Nov 2015 04:18 PM PST There is an article on front page right now about how Antarctica is actually gaining ice(more specifically increasing in elevation) more than it is shedding ice. When we try to quantify sea level fluctuations, is tectonic activity taken into account? [link] [8 comments]  |
| How do radio stations know how many listeners they have? Posted: 02 Nov 2015 03:56 PM PST I'm always curious about analytics and I am wondering how radio stations tell if there are a lot of current listeners - I'd it based on the signal strength? Are they just guessing from time of the day? Are there built in measurement tools in cars that let radio stations know? Thanks! [link] [7 comments]  |
| Would the Monty Hall problem/paradox be affected by an outsider? Posted: 02 Nov 2015 04:57 PM PST So today in my Econ course we were discussing the Monty hall problem and some one asked the question of whether bringing in a second person would affect the probability. So the set up would be that you have some one pick the door and then have Monty open his door. You then bring in a outsider and tell them the current door and that they can choose to switch if they want. Would this second persons probability be 50/50 or would it remain the same as the classic problem. [link] [8 comments]  |
| Is there a limit to how dark I can make my tea? Posted: 02 Nov 2015 03:24 PM PST I was making tea the other day and my tea didn't seem to get darker after using 2 Yorkshire tea bags in a cup. [link] [7 comments]  |
| Why couldn't we accelerate a particle of metal to faster-than-light using magnets? Posted: 03 Nov 2015 01:04 AM PST Using the LHC as a basis for the thought experiment, let's say there's a particle of metal inside the collider tube and there are magnets at intervals all along the tube. If you were to switch on the magnet in front of the particle, it would ostensibly travel the particle forward. In continuous sequence, you could make the particle move around the LHC faster and faster by switching the magnets on in succession more rapidly - essentially dragging the particle forward. Why could you not simply switch the magnets off and on faster and faster that the particle eventually exceeds the speed of light? If you have a mile of "track" and a bunch of magnets in sequence, there is a calculation that would allow the "wave" of magnetism to start at point A and end at point B at virtually any speed, right? Why couldn't a particle in a vacuum tube go along for the ride? [link] [8 comments]  |
| Posted: 02 Nov 2015 04:30 PM PST |
| Is there a limit to how big planets can potentially be? Posted: 02 Nov 2015 03:56 PM PST Is there by any chance a planet as big as our sun or even bigger? What's the largest planet known to man at this present time? [link] [14 comments]  |
| Posted: 02 Nov 2015 07:29 PM PST If you collected enough air in a region of space, it would eventually self-gravitate, forming a hydrostatically stable sphere. (We know this happens because stars exist.) How much air would you need to raise the central pressure of this "gas dwarf" to 1 atmosphere? Is this even possible, or does the requirement for self-gravity push the central pressure far beyond 1 atm? [link] [8 comments]  |
| Is it possible to take an image/video of a live water bear(tardigrade)? Posted: 02 Nov 2015 06:58 PM PST Electron microscope images must be done on a dehydrated and treated sample. This generally means no live samples, as they'd vaporize in the vacuum and because of the extreme temperatures of the microscope. However, water bears are known for their ability to survive in a vacuum and at extreme temperatures. Would it, then, be possible to make a video of a live water bear with an electron microscope? Or is that impossible due to the speed of imaging or some other factor? [link] [3 comments]  |
| Why do carbohydrates cyclize with the chiral carbon furthest away? Posted: 02 Nov 2015 10:17 PM PST Why don't 6-carbon chains connect to the same carbon that 5-carbon chains connect to (and leave the side group in a cyclic sugar longer)? Why can't they connect to the OH group on the non-chiral carbon furthest away? [link] [1 comment]  |
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