With many devices today using Lithium to power them, how much Li is left in the earth? |
- With many devices today using Lithium to power them, how much Li is left in the earth?
- What is the minimum amount of matter that may form a black hole?
- Measuring a star's wobble is used to detect exoplanets, but how can the technique differentiate between one, or greater than two objects?
- Could fusion power offset helium depletion?
- Whу іs саrtіlаgе sо slоw tо rераіr?
- Why does water boil in a vacuum?
- Can "quantum weirdness" be understood in terms of information?
- How many stars were needed to supply all the elements in the solar system ?
- How will fusion reactors harness energy?
- [Biology] Is there any advantage to having a slitted pupil over a round pupil?
- With LED lighting seemingly taking over the lighting market, how much phosphorous is left in the earth to be mined?
- Could a stationary bike with a generator really be used to power lights and simple appliances for 24 hours with only one hour of pedaling?
- Why is 683lm/W maximum efficiency?
- [Physics] Why does Nuclear Fusion only occur at such high heat?
- What scale does gravity start working on?
- Is light outside the visible spectrum made out of photons? If so, how do they manage to penetrate walls unlike visible light?
- How did old satellites transmit photo's to earth? Did they have a digital camera?
- Is a perfect sphere of glass indestructible?
- With SSD speeds getting faster and faster, will they eventually supersede the need for RAM?
- how rare is a tectonic plate system in the solar system/known planets?
- How did the photon temperature drop in a matter dominated universe, while still coupled?
- Why don't IR thermometers work well on shiny surfaces?
- If sound generates heat, how much or how loud of a sound would you need to get a 1°C increase in temperature?
- What caused the switch in the 40s from more girls to more boys to be born?
| With many devices today using Lithium to power them, how much Li is left in the earth? Posted: 05 Dec 2016 06:48 PM PST |
| What is the minimum amount of matter that may form a black hole? Posted: 05 Dec 2016 09:32 AM PST |
| Posted: 05 Dec 2016 12:52 PM PST |
| Could fusion power offset helium depletion? Posted: 06 Dec 2016 05:33 AM PST If we in an imagined future got say 10% of our energy from fusion. Would the helium biproducts be enough for to satisfy our need for helium in science? What about both science and "recreational" use of helium? [link] [comments]  |
| Whу іs саrtіlаgе sо slоw tо rераіr? Posted: 05 Dec 2016 02:11 PM PST Соuld іt bе duе tо сhоdnrосуtе рrоlfіеrаtіоn bеіng lоw, оr mаtrіх sуnthеsіs bеіng lоw, оr іs іt sоmеthіng еlsе whісh іs саusіng іt tо hеаl sо slоwlу? [link] [comments]  |
| Why does water boil in a vacuum? Posted: 06 Dec 2016 07:19 AM PST My father told me that when he was a kid, he did a physics-experiment in his school where he put a glas of water in some sort of vacuumchamber. And as the chamber created a greater vacuum the water would more easily boil. I asked him why that is but he does not remember and he didn't pay that much attention anyway. How come water boils in a vacuum and does it boil no mather the temperture? [link] [comments]  |
| Can "quantum weirdness" be understood in terms of information? Posted: 06 Dec 2016 04:30 AM PST As far as I've been able to tell, in the quantum view, measurable physical entities are considered to be in two kinds of states: measured and non-measured. When they are measured, the values of certain measurable values are leaked into another system (the measurement apparatus is one of these), and they get assigned a definite value. So "measurement" simply means that information gets leaked from the measured system to the one that does the measuring. Does it make sense to see measurement this way? I've gathered this from reading about non-interacting measurement, that is, when the apparatus does not actually interact with what's measured, it just constrains its path in such a way so as to "know" what it's doing, even if it isn't actively checking. But when the experiment is set up in such a way so as not to leak information, physical systems evolve as if the measureable variables have all the possible values allowed by the experimental setup. This is usually called a "superposition". Does it make sense to see superposition this way? This seems to be the logic behind quantum computing: get some bits ready, isolate them informationally from the environment and let them go wild. Unmeasured, they will follow all allowed paths and compute things faster as if they were observed to follow specific paths. More types of logical gates are possible with new paths. You perform a measurement at the end to get the result. Does it make sense to see quantum computing this way? Entanglement seems to simply mean that two (or more) particles are informationally isolated from the environment, but not from eachother, with their measurable values correlated in a specific way. So they exist in their own "informational bubble", even when separated by large physical distances. A measurement of any of the entangled particles is like a breach in this bubble, which instantly reveals its entire structure to the system which measured it. How's my take on entanglement? From the point of view of any physical system, the evolution of other physical systems (including physical systems with only one member, single entities) is inevitably described by probability waves because as long as they are "out of touch", you can only have a vague hunch about what values they will have the next time you "connect" to them via measurement. Does it make sense to view things this way? I work as a coder so thinking in terms of information transfer comes more naturally. [link] [comments]  |
| How many stars were needed to supply all the elements in the solar system ? Posted: 05 Dec 2016 06:29 PM PST Hey there, first of all I know that there was hydrogen and some helium, lithium and berylium formed during the big bang. But the other day I was looking at a spoon and was just thinking "wow, this was forged inside a/some stars". So, was our solar system seeded by a unique star, a few stars or a shitload of stars ? Is there anyway to know with isotopes ? Thank you [link] [comments]  |
| How will fusion reactors harness energy? Posted: 06 Dec 2016 07:06 AM PST Over the years I have seen a lot about fusion reactors containing heat and energy. I understand the basic idea of containing plasma in a strong magnetic field. This way no energy gets transferred to the container. But I have never heard of a mechanism to safely use that heat/energy. How would one get the energy they are producing in a fusion reactor? I know how current fission reactors do it, but that system doesn't seem like it would work. Am I wrong? [link] [comments]  |
| [Biology] Is there any advantage to having a slitted pupil over a round pupil? Posted: 05 Dec 2016 03:17 PM PST |
| Posted: 06 Dec 2016 03:49 AM PST |
| Posted: 06 Dec 2016 05:56 AM PST According to Manoj Bhargava (U.S. Billionaire 5 hour energy drink) he has built a stationary bike with a generator that can do just that. I remember going to the science centre when I was younger and pedalling my butt off on a stationary bike just to get a lightbulb to stay dimly lit. How efficient would the generator have to be to achieve 24 hours of power with only one hour of pedalling? [link] [comments]  |
| Why is 683lm/W maximum efficiency? Posted: 05 Dec 2016 11:55 PM PST Currently studying for exams, and mye lecture book mentions that 683lm/W is max (theoretical) efficiency we can get out of a laser/anything that produces light? [link] [comments]  |
| [Physics] Why does Nuclear Fusion only occur at such high heat? Posted: 06 Dec 2016 07:10 AM PST I'm curious as to why nuclear fusion must happen at such high heat (100 million degrees C) rather than being achievable at a lower temperature. [link] [comments]  |
| What scale does gravity start working on? Posted: 05 Dec 2016 10:29 PM PST I've heard before that gravity doesn't work on a quantum scale, so I assume this means that gravity doesn't effect quantum particles. However, where does it start working? Quarks? Sub-Atomic Particles? Atoms? Molecules? Do we even know? [link] [comments]  |
| Posted: 06 Dec 2016 01:35 AM PST |
| How did old satellites transmit photo's to earth? Did they have a digital camera? Posted: 05 Dec 2016 10:32 AM PST So how did they do it? Did they use CRT camera's and send an analogue video feed to earth? Of did they actually take photographs? [link] [comments]  |
| Is a perfect sphere of glass indestructible? Posted: 06 Dec 2016 01:04 AM PST I had a thought, where if there is a sphere of glass that is mathematically perfect, down to a subatomic level, would that sphere then be indestructible? My reasoning (which might be incorrect) is that Rupert's Drop (the glass droplets that are super strong) are so strong because there is the same amount of force being applied across the entire surface of the drop (minus the tail), and so if they are super strong even while having the miniscule imperfections, would a flawless one not be ultra strong or indestructible? Obviously this idea isn't physically possible but I'm just wondering from a mathematical perspective. [link] [comments]  |
| With SSD speeds getting faster and faster, will they eventually supersede the need for RAM? Posted: 06 Dec 2016 04:12 AM PST |
| how rare is a tectonic plate system in the solar system/known planets? Posted: 06 Dec 2016 12:07 AM PST |
| How did the photon temperature drop in a matter dominated universe, while still coupled? Posted: 05 Dec 2016 11:37 AM PST For a pure radiation dominated universe the temperature (T) drops inversly to its scale factor (a), that is: T~a-1. For a pure matter dominated universe we have T~a-2. I would assume that in a matter dominated universe between 47000 years (radiation-matter equivalence) and 380000 years (photon-decoupling) after the big bang, the temperature of the universe would drop somewhere in between. However I have also read (in a random slide show pdf) that the photon temperature goes as T~a-1 in both cases. Which is true? [link] [comments]  |
| Why don't IR thermometers work well on shiny surfaces? Posted: 06 Dec 2016 03:33 AM PST |
| Posted: 05 Dec 2016 05:04 PM PST |
| What caused the switch in the 40s from more girls to more boys to be born? Posted: 06 Dec 2016 01:30 AM PST So incidentally, while trying to learn python, I made an interesting discovery. I tried to do some excercises in data analysis and for that purpose downloaded the full register of US babynames from SSA available at their website. I managed to produce this curious graph. As one can see there were more births of girls until the 40s, then the boys started to take over. In general I have heard that due to the fact that male sperm carries a Y chromosome which is lighter thatn an X-chromosome makes male sperm more likely to reach the egg first so we should expect more males to be born in general. However I don#t think biology was different before the 40s so I rather assume this is due to more complex reasons such as economic etc. Thanks to anyone who can enlighten me! [link] [comments]  |
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