Difference between different types of Amorphous solids? |
- Difference between different types of Amorphous solids?
- Why do many materials, such as rock and wood, appear darker when wet?
- Is it possible to improve one's vision without glasses or surgery?
- If I were to stand in the middle of a completely sealed, spherical mirror with a light bulb in the middle, would the light build up to blinding levels, or just remain as bright as the bulb?
- Does the human eye see in frames per second?
- Why don't waves through water travel at the speed of sound in water?
- Couldn't the cane toad problem in Australia be solved by genetically modifying a few to have a dominant gene that makes the toad's toxin harmless to other Australian wild life?
- What's the difference between ADHD and depression if both are cause by low levels of dopamine/serotonin?
- Are there any plants that aren't evergreen trees that continue to photosynthesize, flower, and reproduce year round? If not, why not?
- When did climate change enter the public discourse?
- How is "true north" defined, and where is it located?
- How much neutron star material is required for its own gravity to be sufficient to maintain its density? Would a basketball-sized sphere of so-called "neutronium" be stable? Mountain-sized?
- How hot would it become inside a Dyson shell?
- I know of the competence-deviance hypothesis. Is there a corollary: the incompetence-tolerance hypothesis?
- How large would an object in low earth orbit need to be, to be visible to the naked eye from earths surface?
- How is energy conserved when light is red shifted from the expansion of the universe?
- Why are the different drops in this "oil spill" different colors?
- Could there be a loud sound so short in duration (billionths of a second) that our brains can't process it's existence?
- how do we know constants like the speed of light aren't different in far away parts of the universe?
- Are there any known diseases caused by mutations in our DNA that happen post birth?
| Difference between different types of Amorphous solids? Posted: 27 May 2016 12:58 AM PDT So I'm doing a research task about glass, its properties, structure, production, and economic impact, but am having a problem finding a distinct difference in definition between a plastic and a glass. Both are amorphous solids, right? Both undergo a glass transition phase, right? Like plastics don't melt, but rather get softer and harder with or without temperature, and so does glass, so what is the difference by definition? I read that all glass are amorphous solids, but not all amorphous solids are glass. Please explain how this is so, thankyou :) [link] [comments]  |
| Why do many materials, such as rock and wood, appear darker when wet? Posted: 27 May 2016 06:44 AM PDT While at the same time, materials like metal don't appear darker when wet. [link] [comments]  |
| Is it possible to improve one's vision without glasses or surgery? Posted: 26 May 2016 06:34 PM PDT |
| Posted: 26 May 2016 05:08 PM PDT Title basically says it all, but I imagine if you have a box full of bouncy balls, and you keep throwing them in there with infinite energy, adding more and more would increase the density of the balls in the box, so would the same thing happen with light? [link] [comments]  |
| Does the human eye see in frames per second? Posted: 26 May 2016 06:29 PM PDT |
| Why don't waves through water travel at the speed of sound in water? Posted: 26 May 2016 06:32 PM PDT Okay so in materials I know that most acoustic (and optical as far as I know) waves will travel through the material at the speed of sound in that material (i.e. tapping on one end of a metal bar and seeing the response at the other end) but there are examples of things that display "wave-like" properties that do not follow this rule. These examples could be releasing a spring (especially with a low spring constant) and water traveling in waves. So I am just wondering what causes this difference and why these phenomena are observed? My thinking, for the spring example at least, would be that the waves do travel through the spring or slinky at the speed of sound in the respective material but the overall response from the material happens over many waves with a slightly (atomically) larger response in one direction than the other with each wave? [link] [comments]  |
| Posted: 27 May 2016 04:29 AM PDT The cane toad is a big problem in Australia. There are no predators in Australia that can withstand it's toxin. Introducing an other foreign species is not an option, it's what got them in trouble in the first place. Getting rid of them by hand is fighting a losing battle, it creates just more space for more toads to reproduce. So couldn't problem be solved by genetically modifying a few to have a dominant gene that makes the toad's toxin harmless to other Australian wild life? [link] [comments]  |
| Posted: 27 May 2016 12:36 AM PDT |
| Posted: 26 May 2016 06:32 PM PDT |
| When did climate change enter the public discourse? Posted: 27 May 2016 03:51 AM PDT As I understand it, in the 1960s the idea was basically born that human action was having an effect on the environment, in the 1970s a lot of scientists thought the problem was global cooling and a lot of people used that to discredit climate change. In the 1980s it was considered a fringe conspiracy theory. When did it begin to gain credibility in the scientific community and with the public? [link] [comments]  |
| How is "true north" defined, and where is it located? Posted: 26 May 2016 03:40 PM PDT After learning that magnetic north and true north were two different locations, I was curious to find out where true north actually is. I assumed it was at 90 degrees latitude; however now I find out that's not the case. Wikipedia and the UK Ordinance Servery say that Grid North, which I assume is defined at 90 degrees latitude, is different than true north. If so, then what is true north? What defines it? Why does true north not line up with our map grid lines, and why have our maps not been changed to fit true north? What purpose does true north have? [link] [comments]  |
| Posted: 26 May 2016 11:31 AM PDT In TIL today there's a post about how a teaspoon of neutron star material weigh 10 billion tons due to its density. If one were to take that 1 tsp. of neutron star material and place it in interstellar space would it's own gravity be sufficient to maintain its density and remain a teaspoon-sized, 10 billion ton mass or would it revert to 10 billion tons of normal matter with a reasonable density? If it isn't, would a basketball-sized sphere of neutron star material be heavy enough to maintain its stability? How about a mountain-sized sphere? Put another way, what would be the minimum mass of a sphere of neutron star material needed in order for that object to remain as dense as it would if it were on the surface of a neutron star? Once we've established how large that sphere is, how far would we have to be from it to experience 1g (9.8m/s2) of acceleration towards it? How about 0.1g acceleration since I don't want to become neutron star material by being drawn in to it and converted into degenerate matter? Disclosure: I'm not writing a (sci-fi) story nor solving a problem for a class. I have, however, read many stories with neutron stars being part of the plot so I'm curious about their properties as explained by actually physicists/scientists as opposed to clever sci-fi writers who may not have the latest information. [link] [comments]  |
| How hot would it become inside a Dyson shell? Posted: 27 May 2016 02:56 AM PDT Seeing how much radiation the sun is emiting, I imagine it would be quite hot. Also would the earth be liveable if the radius is 1 AU? Thanks in advance! [link] [comments]  |
| Posted: 26 May 2016 09:47 PM PDT I sound like an un-fun elitist, but I spend my time with adolescents, some of their relationships confuse me. I think this extends to most people I know, machines, media, games, and so on. Think about it. [link] [comments]  |
| Posted: 26 May 2016 10:26 AM PDT More noticeable than a star but not taking up a grand section. [link] [comments]  |
| How is energy conserved when light is red shifted from the expansion of the universe? Posted: 26 May 2016 03:39 PM PDT My understanding is that the longer the wavelength of light the lower the energy of the wave. So how can energy be conserved as the light loses energy but the energy is not transferred to anything else? [link] [comments]  |
| Why are the different drops in this "oil spill" different colors? Posted: 26 May 2016 03:57 PM PDT with enhanced color: http://i.imgur.com/UYuZxZO.jpg Post from /r/mildlyinteresting I understand how iridescence and refraction work more or less with different wavelengths bouncing at different angles, but why are different pieces of what I assume are the same material showing such differences in appearance? according to OP: "In the parking lot it was in, it could literally be any fluid in any quantity that goes into a car." [link] [comments]  |
| Posted: 26 May 2016 09:52 PM PDT I know our ears can only pick up a range of frequencies and decibel levels, but say there was an cataclysmic sound that happened in a millionth of a second, would human ears or brain be able to detect it? and is there a certain duration threshold that would make a sound like that audible or not? [link] [comments]  |
| how do we know constants like the speed of light aren't different in far away parts of the universe? Posted: 26 May 2016 08:43 AM PDT Is it that whole 'the Earth isn't special' thing? Is there any way to scientifically prove that? [link] [comments]  |
| Are there any known diseases caused by mutations in our DNA that happen post birth? Posted: 26 May 2016 04:21 PM PDT I know there are disease from mutations inherited from parents (like sickle cell). It seems many diseases are environmental and not genetic. Considering mutations in our DNA accumulate as we age, are there any known ailments or diseases (or research into this subject) that can be caused by damage to our DNA that occured post birth? Sorry if my terminology is off. [link] [comments]  |
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