Where did all the sand in the Sahara Desert come from? |
- Where did all the sand in the Sahara Desert come from?
- How unique is the fact that our moon's rotational speed matches it's traslational speed so that the same side of the moon is permanently facing earth?
- Given that the majority of calculations performed by a computer are some sort of matrix inversion, solution of a linear system equations, or solving some partial-differential equation, are there known Quantum Computer algorithms that actually provide speed-up for these problems?
- Where does the 3/5 term arise from in the potential energy of the charge distribution of a nucleus?
- Water will flow out of long hose if empty first. Not if some water is in it. Why?
- Could you "predict" all of chemistry using only Quantum Mechanics?
- Why there are so few space probes beyond Solar system, only Voyager 1 and 2 from 70s, and New Horizons ?
- Does anyone know what the lines on this measuring cylinder represent? (Or rather their values)
- What is the natural of neutrino interaction with matter ?
- Question about particle/nuclear physics?
- Do skin cells die or get damaged under contact with alcohol like bacteria does?
- How exactly does diabetes work and how do you get it?
- Do rainbow endpoints come in contact with the earths surface or dissipate before reaching it?
| Where did all the sand in the Sahara Desert come from? Posted: 08 Oct 2018 03:22 PM PDT |
| Posted: 08 Oct 2018 06:18 PM PDT |
| Posted: 09 Oct 2018 01:33 AM PDT Looking at a list of quantum algorithms many of the problems seem very... artificial... relative to the kinds of calculations that computers are doing on a daily basis. Factoring primes is nice and all, but can I, say, diagonalize or invert a matrix using a quantum algorithm? If not, shouldn't this be a serious point of concern? I understand the potential as "quantum simulators" and that's certainly potentially valuable, but quantum many-body calculations are only the tiniest sub-set of the numerical calculations that we do in our society. [link] [comments]  |
| Where does the 3/5 term arise from in the potential energy of the charge distribution of a nucleus? Posted: 09 Oct 2018 02:27 AM PDT In the Semi-Empirical Mass Formula, the coulomb term is aZ2 / A1/3 as far as im aware, with "a" being the electrostatic coulomb constant, (3/5)(1/4pi)(1/epsilon0)(1/r0). I understand where all the terms come from as its the simple electrostatic repulsion form, but this 3/5 term seems to come from nowhere. I'm doing tutorial questions and i am ever so slightly numerically out from the solutions we have - however including this 3/5 term i found on Wikipedia gets me to the correct answer, but i haven't seen it before). Sorry for the bad formatting, this is my first post like this. Thanks in advance for any help. [link] [comments]  |
| Water will flow out of long hose if empty first. Not if some water is in it. Why? Posted: 08 Oct 2018 12:50 PM PDT I bought a very long water hose (330 ft / 100m). I hooked it up, opened the valve and water flowed through it without any problem. I disconnected the hose for a minute or two, connected again and nothing came out. I tried blowing through it and even a pump. Absolutely nothing. I disconnected, lifted one end and proceeded to lift the hose a little at a time through the entire length emptying it by gravity. Blew on it again and this time met very little resistance. Connected the hose, opened the valve and water flowed again. I repeated the experiment out of curiosity and let a little air in. The hose was again essentially blocked. Why? [link] [comments]  |
| Could you "predict" all of chemistry using only Quantum Mechanics? Posted: 08 Oct 2018 03:15 PM PDT What I mean is if you could predict the octet rule, the required activation energies for different chemical reactions, the crystalline structure that atoms will form, etc. [link] [comments]  |
| Posted: 08 Oct 2018 02:52 PM PDT |
| Does anyone know what the lines on this measuring cylinder represent? (Or rather their values) Posted: 08 Oct 2018 01:57 PM PDT My father found this odd measuring culling with values that he couldn't recognize the significance of, they are close to fluid ounces, but not exact, as would be expected on a measuring cylinder?Measuring Cylinder [link] [comments]  |
| What is the natural of neutrino interaction with matter ? Posted: 08 Oct 2018 10:53 AM PDT Neutrinos rarely interact with regular matter, but they do eventually and that's how we can detect it. But what is the nature of this interaction ? Is it ionization for example ? Or other kind of interactions with the subatomic particles ? Ultimately, will an ultra dense high energy neutrino burst be lethal with semptoms similar to radiation poisoning/sickness ? [link] [comments]  |
| Question about particle/nuclear physics? Posted: 08 Oct 2018 02:24 PM PDT Is it possible that the quarks making up protons and neutrons in an atomic nucleus might dissociate from each other and interact with the other quarks, such that the nucleus stays together when they have fewer quarks to interact with and possibly form a subatomic particle, but in nuclei with a higher number of quarks, there is a higher probability that they will associate with the appropriate up and down quarks to form a proton or neutron and leave the nucleus, thus causing decay? [link] [comments]  |
| Do skin cells die or get damaged under contact with alcohol like bacteria does? Posted: 07 Oct 2018 09:22 PM PDT |
| How exactly does diabetes work and how do you get it? Posted: 08 Oct 2018 04:25 AM PDT |
| Do rainbow endpoints come in contact with the earths surface or dissipate before reaching it? Posted: 08 Oct 2018 11:53 AM PDT |
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