If atoms are 99% 'empty space', how big would the universe be if we compressed every atom down to it's most space efficient arrangement, essentially leaving no space between particles? |
- If atoms are 99% 'empty space', how big would the universe be if we compressed every atom down to it's most space efficient arrangement, essentially leaving no space between particles?
- We don't feel the earth spinning because it is constant. Yet it is fastest at the equator and gets slower as you move away from it. My question is how come no one ever notices the increase or decrease when traveling towards the equator or away from the equator?
- Why do some objects emit a 'pitchless' sound when hit, and others a 'tuned' sound?
- Are organisms that regrow appendages like flatworms and starfish at risk of diseases like cancer?
- On a rotating object, such as a ceiling fan, does the outermost tip of the fan blade move at a faster velocity than the point that's closest to the center since it has a larger circumference to travel?
- For a given volume, are magnets with a larger surface area stronger than ones with a smaller surface area (in the direction of magnetization)?
- Besides nitrogen fixing bacteria what other non-plants use atmospheric nitrogen?
- Mathematicians/cryptographers, what is the significance of the three-number security code on a credit card? Wouldn't it be just as effective to add 3 more numbers onto the credit card number?
- Would the gravitational waves from the Shoemaker–Levy 9 comet's collision with Jupiter have been large enough to register?
- Why are random access speeds of flash memory different from their sequential access speeds?
- Is it possible, or even desirable, to make wells to recharge aquifers, like this sinkhole near San Antonio?
- Are magnetic metals still magnetic when molten?
- What's the chance of having drunk the same water molecule twice?
- [physics] can exist a spherical configuration of matter, in which for every radius the mean density of the sphere be equall to the density needed to the creation of a black hole?
- Why do glasses and ceramics dry quickly, but plastic tupperware stays wet?
- Are there any effective means to slow memory loss in the elderly?
- Can a neutron star become a black hole?
- Why do solar panels use semiconductors such as silicon? Why not just regular conductors?
- Are earthquake P-Waves audible?
- Do animals get sickle cell anemia?
- Why doesn't the temperature of a gas dissapate as quickly as its pressure in an open system?
- Why does spectral violet seems to have a red hue?
| Posted: 06 Jun 2016 04:00 PM PDT Or our observable universe, whatever is easy to speculate on... My thoughts were that perhaps the universe would become small enough to resemble what was present before the big bang, and the expansion between everything has just taken a very slow and long time (the rate at which our universe is expanding now?) and appears to have "exploded", hence the Big Bang... [link] [comments]  |
| Posted: 06 Jun 2016 07:46 PM PDT |
| Why do some objects emit a 'pitchless' sound when hit, and others a 'tuned' sound? Posted: 06 Jun 2016 12:25 PM PDT If you hit a table, it makes a noise, but not one that you could apply a conventional pitch (like G#) to. If you hit a xylophone it makes a very clear, discernable tone that you can easily assign a note to. Why is this the case? [link] [comments]  |
| Are organisms that regrow appendages like flatworms and starfish at risk of diseases like cancer? Posted: 06 Jun 2016 08:40 AM PDT |
| Posted: 07 Jun 2016 04:48 AM PDT |
| Posted: 06 Jun 2016 08:29 PM PDT For ex take 2 cylindrical magnets that are axially magnetized, would the one that has the larger flat surfaces but shorter cylindrical length be stronger/weaker/same as the one w/ smaller surfaces but longer cylindrical length? Thanks! [link] [comments]  |
| Besides nitrogen fixing bacteria what other non-plants use atmospheric nitrogen? Posted: 06 Jun 2016 07:07 PM PDT I've been trying to understand the nitrogen cycle, particularly as it relates to organic gardening. Compost, manure, various meals, etc get added to the soil to increase the levels of ammonia, urea and other nitrates in the soil. It is my understanding that most of that nitrogen came from directly or indirectly eating plants. Do animals besides bacteria perform any nitrogen fixing? Or is the dissolved nitrogen gas in the body just a side effect of living on earth with no biological purpose in our blood? [link] [comments]  |
| Posted: 06 Jun 2016 07:29 PM PDT |
| Posted: 06 Jun 2016 07:48 PM PDT |
| Why are random access speeds of flash memory different from their sequential access speeds? Posted: 06 Jun 2016 08:57 AM PDT I understand that on rotational disks, sequential reads and writes are faster than random ones because the head is already in place to read sector B after it reads sector A, and moving over to sector Z takes time. But a flash device has no moving parts. Why is reading page A followed by page B faster than reading page A followed by page Z? [link] [comments]  |
| Posted: 06 Jun 2016 11:00 PM PDT Here's a video of water gushing down a sinkhole into the Edwards Aquifer west of San Antonio, TX. Pretty often we're warned that aquifers on the plains, like the Edwards and Ogallala, are on the verge of being emptied, but meanwhile when it rains, most of the runoff goes into the ocean. What would be the negatives of making artificial means to recharge aquifers during rainy spells, so you'd have water to use during droughts? [link] [comments]  |
| Are magnetic metals still magnetic when molten? Posted: 06 Jun 2016 10:38 AM PDT i.e. if I melt down a bunch of steel, will the molten steel still be magnetic? [link] [comments]  |
| What's the chance of having drunk the same water molecule twice? Posted: 05 Jun 2016 06:27 AM PDT |
| Posted: 07 Jun 2016 04:20 AM PDT Citing directly the Wikipedia article https://en.m.wikipedia.org/wiki/Schwarzschild_radius "An object of any density can be large enough to fall within its own Schwarzschild radius," So, is possible to make a configuration that have two distinct radius of schwarzschild? A configuration that have infinite? What would happen in this situation? Even this: can I throw matter around a black hole in a way that another bigger black hole be created around the first? Thanks in regards! [link] [comments]  |
| Why do glasses and ceramics dry quickly, but plastic tupperware stays wet? Posted: 06 Jun 2016 07:24 AM PDT |
| Are there any effective means to slow memory loss in the elderly? Posted: 06 Jun 2016 03:41 PM PDT My father is 70 years old and beginning to have noticably worse memory. His mother (early 90's) has pretty severe dementia, but we don't know if my father is getting the early symptoms of dementia or simply age-related memory loss. In either case, the internet is full of "memory enhancement" gimmicks and pills, but is there anything that is actually effective that I can recommend to him? [link] [comments]  |
| Can a neutron star become a black hole? Posted: 06 Jun 2016 07:02 AM PDT |
| Why do solar panels use semiconductors such as silicon? Why not just regular conductors? Posted: 06 Jun 2016 07:49 PM PDT Would it have anything to do with being able to dope the material as is done with silicon? [link] [comments]  |
| Are earthquake P-Waves audible? Posted: 06 Jun 2016 10:10 AM PDT I had a pretty cool experience this weekend that has started a bit of a debate between a friend and myself. Hopefully you all can resolve it! Saturday morning, I was camping in the Santa cruz mountains above the Silicon Valley in california. At about 6AM I was in my tent, in the middle of the forest, with my head on my camp (air) pillow when I heard a distinct "pop" followed by what can only be described as a low frequency "twang" that smoothly shifted downward in frequency. About a second to a second and a half later, the ground moved. The sound level for the twang was actually fairly high. Those of us still in our sleeping bags on the ground heard it very distinctly, but several in our group were standing up and heard it as well...though they described it as being substantially fainter. If we'd been anywhere other than a dead silent forest at 6AM, we probably wouldn't have heard it at all. As it turned out, we were camped about a kilometer from the epicenter of this earthquake: http://earthquake.usgs.gov/earthquakes/eventpage/nc72645676#general, http://scedc.caltech.edu/recent/Quakes/nc72645676.html. It was a little one, but sitting at ground zero of a 3.4 definitely wakes you up! This has touched off a bit of a debate between one of my fellow campers and myself. He believes that the "pop" and "twang" were higher frequency sound waves generated by the original fracture and release of tension, propagated through the ground and into the air. I argued that it was more likely that the early P-Waves from the quake simply created enough movement to generate sound (by friction) in the soil and rock immediately around us, and that the noise wasn't from the rock fracture itself. He countered with a couple of links claiming that P-Waves occur at frequencies far below the range of human hearing, and that they couldn't have caused the sound. So, the question: What did we hear? Were they P-Waves? What can make the ground "twang" before it moves? Do I owe him a beer? [link] [comments]  |
| Do animals get sickle cell anemia? Posted: 06 Jun 2016 06:49 PM PDT I read before that there was genetic testing done on rats with sickle cell anemia but I'm unsure if that was natural or not. And if animals do get sickle cell, what animals are afflicted with the disease? [link] [comments]  |
| Why doesn't the temperature of a gas dissapate as quickly as its pressure in an open system? Posted: 06 Jun 2016 08:32 AM PDT If pressure and temperature of a gas are directly proportional given closed system, why doesn't heat escape an open system as quickly as pressure? Example, an oven will remain hot for several minutes even if you open the doors. If the air in the oven was under pressure, it would immediately equalize the second you opened the door. Well, wouldn't the pressure of the oven be high if the temperature was high? And so shouldn't the heat in the oven quickly dissipate as soon as you open the door? [link] [comments]  |
| Why does spectral violet seems to have a red hue? Posted: 06 Jun 2016 02:13 PM PDT I've seen several threads here discussing this already, but none seems to have a conclusion. Looking at this article: http://www.huevaluechroma.com/032.php , considering the spectral absorbency of the cones, there's no much sense in thinking that the red cone gets excited from spectral violet, unlike what the CIEE colour matching diagram looks like https://upload.wikimedia.org/wikipedia/commons/thumb/8/8f/CIE_1931_XYZ_Color_Matching_Functions.svg/325px-CIE_1931_XYZ_Color_Matching_Functions.svg.png . The colour zone theory on that same article shows a explanation for that, but i didn't get why does r/g get's positive in the violet area. y/b getting negative makes total sense, once the M and L cones are getting less and less activated while the S gets more. But why does r/g get positive, if there's no more light being absorbed by the L cones than by the M cones on that area? Thanks! (Note: This is a repost, the first post apparently got a bug, it was shown as normal for me, but only for me. It was shown as removed for others users and non-users, so i removed it.) [link] [comments]  |
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