Why is it not possible to simply add protons, electrons, and neutrons together to make whatever element we want? |
- Why is it not possible to simply add protons, electrons, and neutrons together to make whatever element we want?
- I cannot grasp the concept of the 4th dimension can someone explain the concept of dimensions higher than 3 in simple terms?
- Question about basis in infinite dimensional vector spaces?
- Simple question, is anybody able to give me a scientific journal or any verifiable source, for whether or not the refilling of plastic bottles, over a continuous amount of time. Will the bottle degrade and you consume a chemicals from said bottles?
- Why can't we use capacitor as batteries?
- What is the total volume of the sky?
- When we look into the night sky, the light we're seeing from those stars is millions of years old. How do we know how many of those haven't already died?
- Is there an empirical method to calculate the surface area of an irregular solid?
- How can light have momentum if the formula for momentum is p=mv? If light has no mass doesn't that mean it has no momentum?
- Do particle accelerators produce dark matter?
- In a particle accelerator, how is speed of a particle measured?
- Why are there spiral galaxies?
- Why didn't natural selection eliminate poor eyesight before glasses were invented?
- What is the point of using specific gravity?
- What's the name of the property that ∫u+v dx = ∫u dx + ∫v dx?
- [Mathematics] Are there vector spaces where no discrete set of vectors form a basis?
- If there was no dark matter in the vaccum of space would light travel faster? Or does light get slowed down occasionally because of this?
- Have Mental illnesses been around since the dawn of humanity?
- Is there a connection between Bernalism (the communist philosophy of science) and the current reproducibility crisis in science?
- How does radiation effect precious metals?
- Are all metal elements able to be detected by a metal detector?
- Do biologists/neuroscientists agree with the suggestion that there are 58 genders?
| Posted: 25 Sep 2016 12:06 PM PDT |
| Posted: 25 Sep 2016 12:40 PM PDT |
| Question about basis in infinite dimensional vector spaces? Posted: 25 Sep 2016 11:47 AM PDT I read that in infinite dimensional vector spaces, a countable ortonormal system is considered a basis if the set of finite linear combiantions of elements of such system is everywhere dense in the vector space. For example, the set {ei / i in N} is a basis for l2 (oo) (where ei is the sequence with a 1 in the i-th location and 0 everywhere else). I was wondering if there was a way of considering a set a basis if every element in the space is a finite linear combination of the elements of the set and this set is linearly independent. I guess the vector space itself generates the vector space, but it's elements are not linearly independent. Is there a way to remove some of the elements of the vector space in such a way that the set that remains is linearly independent and it generates all the space only with finite combinations? [link] [comments]  |
| Posted: 25 Sep 2016 05:04 PM PDT |
| Why can't we use capacitor as batteries? Posted: 25 Sep 2016 12:09 PM PDT |
| What is the total volume of the sky? Posted: 26 Sep 2016 06:35 AM PDT So my sister had some silly quote on her facebook about "The Endless Sky" which got me thinking that there was no way it could be endless. Is there a "point x" so many meters above ground that starts the sky and then a "point y" that marks the end of the sky and the start of outer space. If so could you measure the volume and/or mass of the sky? [link] [comments]  |
| Posted: 25 Sep 2016 11:57 PM PDT |
| Is there an empirical method to calculate the surface area of an irregular solid? Posted: 25 Sep 2016 09:38 PM PDT Archimedes (apocryphally, at least) provided us with an empirical method of calculating the volume of an irregular solid using water displacement. Is there any analogue for surface area? It would be nice if there were a method that doesn't rely too much on technology (I kinda want something that could've been produced by the Greeks), but I'm interested in any solution that doesn't use any kind of calculus / convergence of approximations arguments. If there is no analogue for surface area, is there some kind of proof or heuristic argument that there can be no such method? [link] [comments]  |
| Posted: 25 Sep 2016 10:48 PM PDT |
| Do particle accelerators produce dark matter? Posted: 25 Sep 2016 08:15 PM PDT |
| In a particle accelerator, how is speed of a particle measured? Posted: 26 Sep 2016 04:00 AM PDT I've seen speeds quoted as "99% the speed of light" or similar, but how is that measured? I assume it's linked to energy decay somehow as there's no way it could be sampled that fast. [link] [comments]  |
| Why are there spiral galaxies? Posted: 25 Sep 2016 12:25 PM PDT Shouldn't they all be elliptical because objects orbiting closer to the center of the galaxy move faster and pass up the stars on the end of an arm. [link] [comments]  |
| Why didn't natural selection eliminate poor eyesight before glasses were invented? Posted: 25 Sep 2016 04:51 PM PDT My train of thought with this is that poor eyesight seems like it would've been a big enough hindrance to things like hunting and gathering and generally not running into stuff and dying back in those times that eventually people with poor eyesight wouldn't have been able to reproduce. Am I just confused on how poor eyesight works? [link] [comments]  |
| What is the point of using specific gravity? Posted: 25 Sep 2016 05:37 PM PDT In my pharmaceutics course/lab I see a lot of density measurements expressed in "specific gravity". I understand that Specific Gravity is the density of a substance in reference to a "benchmark" substance, but that "benchmark" substance is normally water, which is 1 g/mL. So my question is, why bother having a unit of measurement that is, for intents and purposes, equal to density? Are there instances where the reference substance isn't water and specific gravity would be preferable to use? Edit: I'm flairing this as "Medicine" just because I've only encountered Specific Gravity in my pharmaceutics course. If there is a more appropriate flair I'll change it accordingly. [link] [comments]  |
| What's the name of the property that ∫u+v dx = ∫u dx + ∫v dx? Posted: 26 Sep 2016 01:17 AM PDT I believe the phrase I'm looking for is "integration is [adjective] [preposition] addition". (I'm specifically not looking for "[operation] rule".) For instance, "integration is distributive over addition". But you know that thing where you say a phrase, and it doesn't sound like it's actually a thing? [link] [comments]  |
| [Mathematics] Are there vector spaces where no discrete set of vectors form a basis? Posted: 25 Sep 2016 09:53 PM PDT The question is regarding infinite dimensional vector spaces. In quantum mechanics you usually bump into infinite dimensional Hilbert spaces, but I've always noticed that you can find a basis with cardinality = Aleph_0 (the cardinality of the natural numbers). A question I've had since learning QM is wether there exist vector spaces V where the dimension is 'larger than Aleph_0', in the following sense: Let S be a subset of V, a necessary condition for S to form a basis is that |S| > Aleph_0 . Thanks! [link] [comments]  |
| Posted: 25 Sep 2016 05:03 PM PDT |
| Have Mental illnesses been around since the dawn of humanity? Posted: 25 Sep 2016 05:52 PM PDT How did crazy mental illnesses develop? And how did old civilations deal with them? [link] [comments]  |
| Posted: 25 Sep 2016 03:34 PM PDT Don't now if this is the right place, but I am interested in literature to answer the above. [link] [comments]  |
| How does radiation effect precious metals? Posted: 25 Sep 2016 03:34 PM PDT This is a multi part question and I'm not really sure how to ask it. Please forgive me if I ask a question in a stupid way How do metals like gold, silver and copper become radioactive (irradiated (if somebody could clear up the semantic, that'd be nice)) and what happens to these metals when that happens? Does simple proximity to radiation render metals radioactive, eg: if a gold vein and deposit of uranium ore hypothetically shared the same mine, would the gold be useless? why? Would the same radioactive source have the same effect on the same metals, that is to say: would the same thing that reacts with gold react with silver or any other metal left or right of the metals' respective column on the periodic table? Bonus question: Just how harmful is non-enriched uranium ore? [link] [comments]  |
| Are all metal elements able to be detected by a metal detector? Posted: 25 Sep 2016 07:07 PM PDT Simple question I've been wondering, since how the elements are grouped, I have a few questions: Will ALL transition metal be detected? (If not which ones will/won't) Will any Metalloids be detected? Will any alkali metals be detected? Will any basic metals be detected? Will any earth metals be detected! ( by the way, when I'm talking about metal detector, I mean the security-type used in airports and such) Thank you [link] [comments]  |
| Do biologists/neuroscientists agree with the suggestion that there are 58 genders? Posted: 25 Sep 2016 04:16 PM PDT Just curious what people in the actual field believe. [link] [comments]  |
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