What caused this huge GDP per capita boost in 2002-2008? |
- What caused this huge GDP per capita boost in 2002-2008?
- How does dye stick to a fabric so hard that it hardly comes off even with modern detergents?
- Can we make EM Waves that create plasma by ionizing gases?
- How/why do separate species breed?
- Is the Oortcloud (est 0.03 to 3.2 ly) shared with other stars, ex Alpha Centauri (4,36ly) ?
- Is the galaxy a mostly flat plane like it’s depicted in pictures? If so, why?
- How do multiple generating stations know how much electricity to supply?
- In an episode of The Expanse, free floating human blood in zero g or near zero g formed into a "snowflake" crystalline shape when exposed to the vacuum of space. Would that really happen? Is there enough water in our blood for that or would other things like platelets and hemoglobin interfere?
- I've read that the reason water evaporates at room temperature, is because some molecules have enough energy to break free. Even ice evaporates. But then why doesn't every substance evaporate? Like metal or glass or rock.
- How did we distinct cell parts from each other? For example how did we know that a nucleus and the mitochondria isn’t the same thing? Also how did we figure out their functions?
- Is light reflected off matter or is light absorbed and then released?
- Why don’t rockets use outside air as an oxidizer while they are in the atmosphere?
- How does the transitivity of verbs very between languages? Meaning: Are some verbs always or almost always transitive in different languages? Are some verbs variable in whether they are transitive or intransitive across languages? Does every language have a concept of transitivity?
- Can getting struck by lightning really blow your shoes off? If so, how does that happen? What is the force that causes it?
- When friction occurs,what is happening on the atomic level?
- Why is an LED light more efficient?
- Why is the sitting position of birds stable despite looking like they should tip over?
- What is functional form in this plot of dielectric constant versus frequency of alternating current from a materials science introductory text?
- Are telescope images of objects such as galaxies that are hundreds or thousands of light years across, are they distorted?
| What caused this huge GDP per capita boost in 2002-2008? Posted: 21 Nov 2019 03:25 PM PST Hi guys, During the period of 2002-2008 there seems to have been a hugely massive economic boost to The Balkans in particular but other countries as well, and currently for the last 5 years it seems that most countries are not in a period of major growth, even less growth than during the great recession. Sadly for me during this period I was 5 yo so I dont really remember what happened and why [link] [comments]  |
| How does dye stick to a fabric so hard that it hardly comes off even with modern detergents? Posted: 22 Nov 2019 05:52 AM PST |
| Can we make EM Waves that create plasma by ionizing gases? Posted: 22 Nov 2019 04:23 AM PST |
| How/why do separate species breed? Posted: 21 Nov 2019 06:36 PM PST It's rare but different species have bred in the wild. But how? Why don't they attack one another like they normally would? For example, coyotes and wolves are two separate, but closely related, species that have bred without human interference. But they're rivals with different behavior. I assume they mate and then part. They can't rear the pups together, right? On that note, do coywolf pups get raised by single mothers or do males of their mother's species help, despite not being their pups? Another example I know of is Big Bird, the cactus finch. He somehow bred with completely different finches. How did he attract the females despite having the wrong call and being of the wrong species? I know his children couldn't attract anyone but each other despite having his call. [link] [comments]  |
| Is the Oortcloud (est 0.03 to 3.2 ly) shared with other stars, ex Alpha Centauri (4,36ly) ? Posted: 22 Nov 2019 06:31 AM PST I pictured the oortcloud as a far flung region of stuff loosely affected by the sun. But since it seems to stretch so far out that parts actually are closer to other stars wouldn't that make it shared? Or does it refer to the region of interstellar comets that are affected by our sun? But Doesn't the Alpha Centauri system have a higher mass than our sun shouldn't it be more affected then? Or doesn't this have to do more with he fact that stars aren't static and are moving relative to each other so that the Oort cloud are "our" comets and they have theirs but since the distances are so huge and we aren't necessarily very close for too long it doesn't matter too much? [link] [comments]  |
| Is the galaxy a mostly flat plane like it’s depicted in pictures? If so, why? Posted: 21 Nov 2019 02:46 PM PST In most artistic depictions of the Milky Way galaxy, it's illustrated as a roughly flat 2 dimensional plane. What I was wondering is if that's really the case, or if solar bodies revolve "above" (relative to said 2D "plane") and "below" the center of the Milky Way? [link] [comments]  |
| How do multiple generating stations know how much electricity to supply? Posted: 21 Nov 2019 03:31 PM PST Let's assume Generating Station A and Generating Station B are both supplying customers on the same grid. I understand electricity is fungible and they only know how much a customer uses by looking at a meter. I can hypothetically (but not practically) understand how total grid load is measured, and how a single generating station can tell how much electricity to generate for this grid demand. But when meeting an instantaneous grid demand, how do plant operators at Generating Station A know how much to supply the grid for their customers at a particular instant in time, and how do plant operators at Generating Station B know how to much supply their customers at a particular instant in time? Is there some sort of encoded signaling going on at the level of individual customer meters, to notify a specific generating station of the demand required? [link] [comments]  |
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| Is light reflected off matter or is light absorbed and then released? Posted: 21 Nov 2019 01:39 PM PST Are my curtains red because all other light is absorbed and (mostly) the red wavelengths are reflected, or does the fabric absorb the phiton and then release light of a red wavelength? [link] [comments]  |
| Why don’t rockets use outside air as an oxidizer while they are in the atmosphere? Posted: 21 Nov 2019 01:04 PM PST So I was reading that jets have a very high specific impulse because use outside air and I know that this is impossible to do while a rocket is in space but why would a rocket not make use of outside air while it is still in the atmosphere to attain a higher specific impulse?Wiki Specific ImpulseNASA Air Breathing Rocket Engine Research [link] [comments]  |
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| Posted: 21 Nov 2019 02:42 PM PST I've heard stories before about people getting struck by lightning and it blowing their shoes off. This morning one of my workmates (not someone who I believe makes things up or tells tall tales) told me a story about a guy he knew who was struck by lightning. As his story went, he was in a forest when a lightning storm began. He sat against a tree to wait the storm out. That tree was struck by lightning, which traveled through the tree and him. He suffered burns along his head and body and it "blew his boots off." Supposedly the force was so great that his boots, which were shin high, separated at the ankles and the bottoms were blown off. Is this story plausible? If so, what is the force that would cause this explosive separation? Also, why would it not destroy the person's feet in the process? [link] [comments]  |
| When friction occurs,what is happening on the atomic level? Posted: 21 Nov 2019 12:02 PM PST |
| Why is an LED light more efficient? Posted: 21 Nov 2019 11:55 AM PST |
| Why is the sitting position of birds stable despite looking like they should tip over? Posted: 21 Nov 2019 12:52 PM PST Birds have the feet position of dinosaurs but have no tails. In most cases their apparent center of mass is forwards of their feet. This would cause them to fall over. What causes their true center of mass to be in a different position than it would appear? Secondly their legs attach to the body further back of where the feet touch the ground. This causes torque wanting to rotate the bird face down. How is this torque countered? Doesnt it put more stress on the joint? Also the pubis bone of birds has a pointy end pointing outwards. how is this not a problem? It looks like it would hurt if a bird hit a hard surface butt first. [link] [comments]  |
| Posted: 21 Nov 2019 05:22 PM PST This is the plot taken from Callister 7th ed., pg. 710. I'm interested in the functional form of this plot because I'm looking for a function that is like a continuous step function - similar to the plot here but positively increasing. Does anyone know of such functions? Similar functions are the step function (obviously) and a sigmoid function but I'm looking for a function that is a mixture of both. Any help is always appreciated! [link] [comments]  |
| Posted: 21 Nov 2019 09:51 AM PST My thought process is that if you look at a galaxy from an angle that would put one end of the galaxy dozens if not hundreds of light years closer to us than the furthest end, would that mean that we are looking at a distorted image? [link] [comments]  |
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