What exactly would the landscape of the British Isles have looked like prior to human cultivation? |
- What exactly would the landscape of the British Isles have looked like prior to human cultivation?
- Can we do anything interesting with the weak force?
- In what way does the regulation of cell differentiation in a Hydatidiform mole differ from normal tissue and embryo growth?
- How long would it take to fall from geosynchronous orbit?
- How does the space shuttle escape hatch work?
- How are we utilizing quantum mechanics in the pursuit of technology?
- What caused the long brown stripes on the surface of Europa?
- What causes black holes to have an upper limit to their rotational speed?
- How would a negatively-charged gas mixture react when propelled when enveloped in an extremely positive gas "shell"?
- If an atomic nucleus were the size of a beach ball, what observable properties would it have?
- If Venus has no EM field how does it retain its atmosphere?
- Why doesn't glue dry in the bottle even after long periods of time?
- Is it possible that instead of dark matter being a force that holds galaxies together, there's something else like space having an outward pressure?
- Using a 300MHz oscillator, could I make a miniature microwave transmitter?
- Is there something wrong with Bell's inequality?
- If the Big Crunch is supposed to happen at some point, then why is the universe expanding at an accelerating rate? Shouldn't it be slowing down and/or reversing?
- How was Millikan able to calculate the charge of an electron so precisely?
- Why do certain diseases have a latency stage between its secondary and final stage of infection?
- Why does Pascal's Triangle give the powers of 11?
- Is it possible to find a basis for the set of continuous functions?
- Does Planck's Constant divided by Boltzmann's Constant have any particularly meaning?
- Does the hydrogen electron move in a Sine wave shape?
- How does the electric field behave as a charged particle falls into a black hole?
| What exactly would the landscape of the British Isles have looked like prior to human cultivation? Posted: 13 Feb 2017 02:50 AM PST When you look at the landscape of the United Kingdom today, the vast majority of it consists of either towns or farmland. The human race has left an enormous impression on what Britain looks like, perhaps more so than most other nations on Earth. What would Britain have looked like during, say, the middle Paleolithic? Or at least before the development of agriculture. I've always imagined it to be heavily forested, perhaps resembling rural Canada or Scandinavia today. But I have no real knowledge on this subject - is my view in any way accurate? Or is there even any way of knowing for sure? [link] [comments]  |
| Can we do anything interesting with the weak force? Posted: 12 Feb 2017 07:00 PM PST We are pretty good at harnessing electromagnetism to do useful things. Can we make the weak force do anything interesting or useful? I don't mean wait around to see randomly occurring beta decays, I mean set up a weak field to harness the force in some way. [link] [comments]  |
| Posted: 12 Feb 2017 09:16 AM PST Somehow, the order of switching on and off pathways of cellular differentiation is all screwed up and chaotic, yet enough order remains that distinctive patches of coherently organized tissue occurs? What is going on, and what is directing the hox genes this way, if they are involved? [link] [comments]  |
| How long would it take to fall from geosynchronous orbit? Posted: 12 Feb 2017 05:30 PM PST I'm assuming the object is correct distance from the earth to be in geosynchronous orbit but it's angular velocity is zero. [link] [comments]  |
| How does the space shuttle escape hatch work? Posted: 13 Feb 2017 05:25 AM PST I saw "Space Cowboys" last night, and near the end of the movie the space shuttle descends through the atmosphere, heatshields glowing. When it reaches a lower altitude they open the escape hatch, and some astronauts parachute out while the protagonists land the shuttle in "space cowboy" fashion. Yes, it's a movie, but some questions nonetheless: Has this kind of escape hatch ever been used in real shuttle operations? What is the effect of an open escape hatch on the ability to land the shuttle? How realistic is the landing maneuver in the film? [link] [comments]  |
| How are we utilizing quantum mechanics in the pursuit of technology? Posted: 12 Feb 2017 12:33 PM PST I think my question is more basic than it sounds. I understand HOW we use it, entanglement, superposition, etc. What I'm wondering is how we even get there! Atoms themselves are so incredibly small; how do we go about manipulating electrons and fundamental particles? What kind of equipment or technology is necessary? [link] [comments]  |
| What caused the long brown stripes on the surface of Europa? Posted: 12 Feb 2017 10:26 PM PST Nasa released this photo of Europa and I noticed the long brown stripes on its surface. If the planets surface is ice with a large ocean beneath its surface what would cause the long brown streaks on the surface ice? Could it be meteors? This does not seem likely to me but who knows. Just thought id ask. (Source: http://photojournal.jpl.nasa.gov/jpeg/PIA19048.jpg) [link] [comments]  |
| What causes black holes to have an upper limit to their rotational speed? Posted: 12 Feb 2017 07:10 PM PST Wikipedia mentions the theoretical upper limit to how fast a black hole can rotate. What is the limiting factor? [link] [comments]  |
| Posted: 12 Feb 2017 05:26 PM PST I am wondering if a negatively charged gas enveloped in a positive gas "shell" would remain intact, and how it would react. Thank you. [link] [comments]  |
| If an atomic nucleus were the size of a beach ball, what observable properties would it have? Posted: 12 Feb 2017 03:02 PM PST For example, what would it look like, feel like, how heavy would it be, etc. [link] [comments]  |
| If Venus has no EM field how does it retain its atmosphere? Posted: 12 Feb 2017 02:22 PM PST |
| Why doesn't glue dry in the bottle even after long periods of time? Posted: 12 Feb 2017 08:48 PM PST |
| Posted: 12 Feb 2017 11:06 PM PST |
| Using a 300MHz oscillator, could I make a miniature microwave transmitter? Posted: 12 Feb 2017 07:00 PM PST I was thinking something like this: https://cdn.instructables.com/F5M/V9NW/OT2EXCFDNO4/F5MV9NWOT2EXCFDNO4.MEDIUM.jpg I wasn't sure if I would need to add another power source or a resistor. [link] [comments]  |
| Is there something wrong with Bell's inequality? Posted: 12 Feb 2017 02:51 PM PST Something has been bothering me for a few days after watching Veritasium's video on quantum entanglement again, specifically the expected frequency for local hidden information. Can't disagree with the math, but it felt like the premise was wrong for same axis, opposite directions. Accepting the numbers given (if it's supposed to be up in vertical, then it would have preference for a certain alignment at 60°, 3/4 of the time), I drew the expected measurements for a static axis (ignore that most of these aren't actually 60°, apparently it's too hard to split half a circle in 3): http://imgur.com/a/io6wM . Darkened area is where the north of the axis could be located given the first observation. The bottom of the page shows possible positions for the axis when knowing the answer for all 3 directions (it could never be up for vertical, then down for both 60° and -60° for the same particle, since it would need 2 axis, which doesn't make sense for 3d volumes) and what would be determinable by observating 2 particles. When we know a spin to be x in the vertical, we also know it to be 3/4 x at 60°, and 60° happens 2/3 of the time. Isn't this the same from 07:27 in the video? So, considering the observations, it seems I reached the same expectation, which would result in the same 50% up or down on average for both inclined detectors when compared to the vertical one. Is there something too crazy here I'm not seeing? EDIT: If I'm right about this, I might have found a mistake in my page. How can it be that the first split will also make it more likely that the axis would be towards the middle? What happens if 60° is measured first? With non locality it's easy: it just is. But preserving locality and ignoring loopholes, maybe this is only true for the vertical direction. If that's the case, then measuring 60° first, the vertical should still be 3/4, 1/4. But, the opposite 60° should be 5/8, 3/8 since it keeps the whole more likely slice (2/4, or 1/2) and half of one of the more unlikely (1/2 + 1/8 = 5/8) for the same direction. [link] [comments]  |
| Posted: 12 Feb 2017 04:00 PM PST I was reading my Physics textbook (grade 11 level) and it says "if enough mass exists in the universe, gravity could ultimately stop and reverse the expansion of our universe, leading to what is sometimes referred to as the Big Crunch." Doesn't the singularity before the Big Bang contain all matter that exists now? If there is enough mass, why did the Big Bang happen in the first place, and all the mass not stay in its singularity form? Otherwise, would the Big Bang and Big Crunch happen over and over again? Sorry if there's a lot of questions. [link] [comments]  |
| How was Millikan able to calculate the charge of an electron so precisely? Posted: 12 Feb 2017 10:42 AM PST I can't wrap my head around how he was able to calculate a value for charge in the neighborhood of 10-19 using such a crude measurement system. Anything could have impacted the measurements, from his own fatigue in eyeballing the oil drop motion and size, to slight variations in the content of the air in the system, to the vibrations of the apparatus, to his electrical measurements being imprecise due to effects like resistive heating or voltage fluctuations. I suppose all these could be made to be less impactful by measuring more drops, OR by the charge amount on each drop being a relatively small integer, but I'm having trouble wrapping my head around the precision he was able to achieve with his experiment. (I realize he was off by something like 2%, that still doesn't change the fact that we're talking about quantities in the 10-19 range) I must be looking at this the wrong way, can anyone help me? [link] [comments]  |
| Why do certain diseases have a latency stage between its secondary and final stage of infection? Posted: 12 Feb 2017 08:27 PM PST After reading articles about diseases like AIDS and Syphilis, many pointed out that there actually exists a latency period before the disease progress from its secondary stage of infection to its final stage. What exactly happens during this latency period? Why is it that symptoms disappear during this latency period? Is it because our immune system is responding to the infection? [link] [comments]  |
| Why does Pascal's Triangle give the powers of 11? Posted: 12 Feb 2017 12:32 PM PST So the first five rows are self explanatory. 1, 11, 121, 1331, 14641 are 110, 111, 112, 113 and 114. But then the next row is the first with double digits so it's not exactly a power of 11 anymore. It's 1 5 10 10 5 1, but then I noticed, 1 (5+1) (1+0) 0 5 1, or 161051 is indeed 115. The next row is 1 6 15 20 15 6 1 so if you did what I did earlier and added the digits next to each other you get 1771561 which is 116. Etc. etc. So any explanations? [link] [comments]  |
| Is it possible to find a basis for the set of continuous functions? Posted: 12 Feb 2017 01:27 PM PST Following up on this, do infinite dimensional vector spaces necessarily have a basis? [link] [comments]  |
| Does Planck's Constant divided by Boltzmann's Constant have any particularly meaning? Posted: 12 Feb 2017 01:36 PM PST By dividing the constants you get roughly 4,8x10-11 Ks. Does it have any meaning in nature, and/or does it relate to any physical phenomena? [link] [comments]  |
| Does the hydrogen electron move in a Sine wave shape? Posted: 12 Feb 2017 12:59 PM PST When I took quantum physics in college, they covered the Schrodinger equation. It said that the electron around hydrogen acts like a wave. Does this mean it moves around the atom like Sine wave shape? The double-split experiment proved that electrons are both particles and waves. [link] [comments]  |
| How does the electric field behave as a charged particle falls into a black hole? Posted: 12 Feb 2017 12:01 PM PST Specifically, how does the field smoothly transition from the field of an in-falling charged particle to that of a spherically symmetric black hole? It seems to imply that to a distant observer, the field due to a charge at the event horizon of a black hole would have to be spherically symmetric around the center of the black hole (at least, assuming a spherical black hole). How does that happen? [link] [comments]  |
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