Why is sodium chloride the dominant salt in seawater? |
- Why is sodium chloride the dominant salt in seawater?
- What's the difference between a Neutron Star and a Pulsar?
- Is daytime darker on Mars since it is further than the sun? How does atmosphere affect the brightness of a planet?
- Why does Calculus use dx to represent the change in x when other areas of science, such as physics, use delta-x?
- Are there any phosphors that glow when exposed to radiation?
- If everything consists of probability waves, why do I see things where they are? Why does a book appear at an exact location to me and everyone else but not in an infinite possibility of locations?
- Why do some flowers, mushrooms, and plants prefer areas with less light to grow? Shouldn't all plants want more energy from the sun?
- If I drop a ball such that it falls randomly into one of 3 boxes, how many drops on average until each box has at least 100 balls in it?
- How do satellites in Space send signals back to Earth?
- Could energy be produced from sound?
- What is the physical meaning of "negative" absolute temperature for a system?
- Is the cube-root of a negative number imaginary?
- Why do we see meteor showers some specific days only?
- Why do lithium ion batteries expand(puff up) over time?
- What place on Earth has the weakest seasonal cycle?
- The idea that disjoint events are dependent by nature confuses me. Could somebody dumb this down?
- Why do different substances have different specific heat values?
- What is the most ecologically diverse/disparate class (Actinopterygii, Mammalia, Aves, etc.) of all extant vertebrates?
- What is the most efficient way to convert electricity into heat?
- What is the relationship between waves of probability amplitudes and waves of EM field strength?
- Why does the natural oxide layer on Titanium impede anodization?
- Does the total pressure in the headspace have any effect on a gas' solubility assuming its partial pressure remains contant?
- Does the Sun appear to move through the sky at different speeds at different times of the day?
- What is a neutron star made of?
| Why is sodium chloride the dominant salt in seawater? Posted: 03 Oct 2016 08:28 AM PDT Why sodium instead of lithium, potassium, etc? Why chloride instead of sulphate, phosphate, etc? [link] [comments]  |
| What's the difference between a Neutron Star and a Pulsar? Posted: 04 Oct 2016 06:14 AM PDT I've always thought the names were interchangeable terms for the same object, but since starting my astro course I'm coming across more and more literature describing them as separate types of object. For example:
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| Posted: 03 Oct 2016 08:06 AM PDT I'm taking a Calculus class this year along with a physics class and dx and delta-x seem to represent the same thing. Why are there two different symbols used (d vs. delta)? Is there even a reason? [link] [comments]  |
| Are there any phosphors that glow when exposed to radiation? Posted: 04 Oct 2016 02:31 AM PDT I have heard of cathode ray tubes but are there any materials that produce light when radiation (such as background radiation) hit them. [link] [comments]  |
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| Posted: 03 Oct 2016 06:43 PM PDT I guess average could mean the most likely number of drops (mode) or a weighted average based on the chance of each number of drops. Is there a probability distribution that describes this situation? It would be nice to have a generalizable solution for any number of boxes and balls. [link] [comments]  |
| How do satellites in Space send signals back to Earth? Posted: 04 Oct 2016 02:46 AM PDT For example the New Horizons spacecraft that sent pictures from Pluto? How do they get all the way back to earth? I'm guessing it's infrared signals or something but I don't understand at all how stuff like that works. [link] [comments]  |
| Could energy be produced from sound? Posted: 04 Oct 2016 06:26 AM PDT what I mean is: electricity is used to produce sound (ipod, headphones, stereo) ,the electricity is used to move an object at such a frequency that it creates sound. Now could this not be reversed? to have an object be moved by soundwaves and generate electricity? or will soundwaves always be too weak for this purpose? I am aware the efficiency would be as close to 0% as it can get, but say we take a factory as testing ground, would it work to turn the loud noise of the machines working into electricity? probably should xpost this to r/shittyaskscience right? [link] [comments]  |
| What is the physical meaning of "negative" absolute temperature for a system? Posted: 03 Oct 2016 03:40 PM PDT I recently ran into the term "sub-Kelvin temperatures" while reading a research paper, and after a little googling, I found it seems to refer to temperatures "below" absolute zero, i.e. negative values. What do negative absolute temperatures mean? What would such a physical state look like? [link] [comments]  |
| Is the cube-root of a negative number imaginary? Posted: 03 Oct 2016 11:19 PM PDT Wolf Alpha%5E(1%2F3)) says it is imaginary (or at least has an imaginary component). Kahn Academy (and my understanding of cube roots) says it's a real, negative number. So which one is right? Is it a real or an imaginary/complex number? [link] [comments]  |
| Why do we see meteor showers some specific days only? Posted: 04 Oct 2016 01:22 AM PDT |
| Why do lithium ion batteries expand(puff up) over time? Posted: 03 Oct 2016 02:59 PM PDT More specifically cell phone batteries. I've seen tons of batteries over the years where after a certain point they just start blowing up like little balloons. What is happening and why? [link] [comments]  |
| What place on Earth has the weakest seasonal cycle? Posted: 03 Oct 2016 05:58 PM PDT Strength of seasons being defined as smallest amount of variation in temperature and precipitation over a year. I recognize that the answer may be somewhat ambiguous due to the two-dimensional nature of the "strength of season" definition. [link] [comments]  |
| The idea that disjoint events are dependent by nature confuses me. Could somebody dumb this down? Posted: 03 Oct 2016 10:49 AM PDT So my professor managed to temporarily convince me of this idea using the example that if you remove the possibility of one disjoint event that the others are more likely, and I agree with this part. However, is this not true for many independent events as well, such as flipping a coin (a very common example of an independent event)? If you knew the coin would be heads, would it not mean that it would 100% be tails? Are these not disjoint events? The whole concept seems contradictory, like I'm missing something. [link] [comments]  |
| Why do different substances have different specific heat values? Posted: 03 Oct 2016 07:28 PM PDT The fact that different materials have different specific heats (joules/kgK) is very surprising to me. If heat is a form of kinetic energy, it seems that each material should have the same specific heat, because the ability to raise and lower a temperature of an object seems like it should depend solely on its mass. Consider in classical newtonian physics, an object has a specific kinetic energy based solely upon its mass and velocity, independent of it's material properties. What am I missing? [link] [comments]  |
| Posted: 03 Oct 2016 09:29 AM PDT I'm doing some formal encyclopedia-like descriptions of animal clades that will be used for teaching. I suspect that mammals are the most ecologically diverse/disparate terrestrial vertebrates, though it would be a close run race with birds. I'd like to include this in their description. I've checked casually with an ornithologist and ornithology student who agreed, but that's far from a consensus. 1. What is the most ecologically diverse/disparate, terrestrial vertebrate class. I then got to thinking: Could birds or mammals be even more ecologically diverse/disparate than all vertebrates including ray-finned fishes (30,000+ species!) given that there are many ecologically specialized aquatic birds and mammals but few land-dwelling ray-fins? Here, I suspect the answer may be that ray-finned fishes are more ecologically diverse (i.e. there are more specialist niches overall), but less disparate (i.e. more clustered around different variants of aquatic faunivory in marine/aquatic habitats) than birds or mammals. Thus, 2. What is the most ecologically diverse/disparate class of all extant vertebrates? These have been difficult questions to research, and I think trying to falsify these hypotheses and generating a consensus from /r/askscience is more appropriate than simply citing the assumptions of others. While I am all for monophyly, in this context I am referring to the traditional, paraphyletic definitions of these classes such that Sarcopterygii excludes Tetrapoda, Reptilia excludes Aves, and so forth. [link] [comments]  |
| What is the most efficient way to convert electricity into heat? Posted: 03 Oct 2016 02:30 PM PDT I'm wondering what the most efficient way to convert electricity into heat. Not looking to heat any specific object just something that radiates heat more or less. [link] [comments]  |
| What is the relationship between waves of probability amplitudes and waves of EM field strength? Posted: 03 Oct 2016 08:21 AM PDT I've studied basic QM and started looking into QFT, but I'm hung up on something basic. QM 101 is all about describing a single ideal particle, which is described by a wavefunction over space. Part of that description is the energy of the particle, in the form of the frequency of the wavefunction. But how does this relate to many-particle systems, or the classical EM field? Does each particle's wavefunction add up on top of each other (so to speak)? [link] [comments]  |
| Why does the natural oxide layer on Titanium impede anodization? Posted: 03 Oct 2016 05:14 PM PDT I'm familiar with the basic physics behind anodizing titanium but I'm very puzzled by why natural air oxidation behaves so differently than even low voltage anodizing. In order to get bright colors from anodizing you typically need to chemically prep the surface by removing the oxide layer. The difference is noticeable at low voltages and dramatic at high voltages. You can also apply a "base coat" of anodization at 5V or so which will allow you to anodize to a higher voltage later without needing to remove the oxide layer again. It seems like even a short exposure to air can ruin the surface and lead to bad / unexpected anodizing results. For example I've had the color at 85V go from green to bright pink because of a few minute exposure to air. In all cases the surface was cleaned / de-greased. Why does this happen? My understanding is that anodizing is basically just forcing a thick oxide layer to form. I'd expect that exposure to air would be equivalent to what you'd get from anodizing at a very low voltage. So why can't you build on the natural oxide layer the same way as an electrically formed layer? [link] [comments]  |
| Posted: 03 Oct 2016 05:51 PM PDT Say I have gases A and B occupying the headspace of a sealed container where Pp(A)=0.5atm and Pp(B)=0.5atm. Now consider two scenarios.
The partial pressure of gas B in both cases is 0.5 atm and according to Henry's law the solubility should also stay the same, but is that actually what happens? [link] [comments]  |
| Does the Sun appear to move through the sky at different speeds at different times of the day? Posted: 03 Oct 2016 08:39 AM PDT If the arc subtended by the Sun's path during the day is divided into equal parts, does the Sun cover each part in equal times? Does this depend on season or the location of the observer on the Earth? [link] [comments]  |
| What is a neutron star made of? Posted: 03 Oct 2016 06:42 PM PDT I know it's super dense matter but beyond that I couldn't find anything. Could it be some super heavy element or could it be some other kind of matter? I'm very curious. Thanks for your responses [link] [comments]  |
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