By guessing the rate of the Expansion of the universe, do we know how big the unobservable universe is? |
- By guessing the rate of the Expansion of the universe, do we know how big the unobservable universe is?
- What is the physical setup used for the production of thermal neutrons used to create the 'Rio Red' grapefruit strain?
- What causes the difference between kinetic and static friction?
- If Concentration of hydrogen on sun is 1.1%, then what's the rest?
- In string theory-Brane cosmology: Is the collision of two branes considered to be the cause of the big bang?
- Why does enthalpy of atomization *increases* down the group in transition elements?
- My paper grocery bag says "This 100% recyclable bag made from 100% recycled paper" could this process be repeated ad infinitum?
- Do the oceans get saltier over time? Has this had any biological impact?
- why is it important to autoclave the medium soon after preparing it or to keep it refrigerated until it can be sterilized?
- Does a superconductor truly have 0 Ω resistance, or is it only arbitrarily close?
- How far away from the nucleus does 100% of the electron cloud extend?
- How do stars generate elements "heavier" than lead?
- Why does the US launch rockets in Alaska?
- Can a parasite change a human's genome?
- What chemically defines an element as a metal?
- How can alkenes be diastereomers and have diastereotopic protons?
- Besides solar are there any industrial scale means of generating electricity other than turning a turbine?
- Is it true that stars orbit the galactic center at the same speed, regardless of their distance from it? Is this still thought to be an effect of dark matter? How would dark matter need to be dispersed to create the result we observe?
- How does a dipole in a electric field or a bar pendulum in a gravitational have a torque acting on them if Coulomb force and Gravitational forces are central forces and angular momentum is a conversed quantity? How does the torque come about?
| Posted: 06 Feb 2017 04:29 AM PST So we are closer in size to the observable universe than the plank lentgh, but what about the unobservable universe. [link] [comments]  |
| Posted: 06 Feb 2017 06:29 AM PST I was reading about red grapefruit and how they were created through radiation mutagenesis. In particularly the Rio Red commonly used is cited as having been the product of thermal neutron irradiation of plant tissues in the 1980s in Rio (the city). None of the biology articles talk about the physics of the setup. Given no nuclear reactors in Rio how would this be done? My first guess is a strong natural alpha emitter with beryllium and surrounded by a hydrogen plastic moderator. (ref). Or maybe just a Californium-252 neutron source with plastic moderator. But that's the point, I don't know which or what. Hensz's actual papers about the 'Rio Red' and many others cite Caldecott et al 1954 but none of them have detail. I've spent about ~45 minutes searching for the early 1950s protocol papers on the subject by Caldecott but there's nothing but abstracts online. Does anyone in the field know about the actual setup used by plant biologists for thermal neutron mutagenesis? [link] [comments]  |
| What causes the difference between kinetic and static friction? Posted: 06 Feb 2017 06:24 AM PST Hola physicists (and everyone else), I was wondering (out of the blue) why moving objects once they are in motion is easier than the initial movement. Can't recall any physics teacher actually discussing it. [link] [comments]  |
| If Concentration of hydrogen on sun is 1.1%, then what's the rest? Posted: 06 Feb 2017 04:30 AM PST |
| Posted: 05 Feb 2017 02:22 PM PST A follow up question: How many other ways can branes interact with one another? [link] [comments]  |
| Why does enthalpy of atomization *increases* down the group in transition elements? Posted: 06 Feb 2017 03:16 AM PST Also whats up with the anomalous enthalpy of atomization of Tc, Mn? [link] [comments]  |
| Posted: 05 Feb 2017 01:19 PM PST Would there be material lost everytime? Or a limit to the number of times the material could be used? Same question about plastic or metal recyclables. [link] [comments]  |
| Do the oceans get saltier over time? Has this had any biological impact? Posted: 05 Feb 2017 02:03 PM PST From what I know ocean salt comes from land deposits, so there's a constant influx of salt into the ocean. But from evaporation no salt leaves. It seems to me that this would imply an increase in salt concentrations. [link] [comments]  |
| Posted: 05 Feb 2017 06:05 PM PST When we are preparing medium, bacteria can contaminate it quickly because it is nutrient rich. Autoclaving the medium can sterilize it quite effectively. However, what problem can occur with the medium if we were to prepare it on one day, leave it on the bench at room temperature and then autoclave it two days later? (In other words, why is it important to autoclave the medium soon after preparing it or to keep it refrigerated until it can be sterilized? [link] [comments]  |
| Does a superconductor truly have 0 Ω resistance, or is it only arbitrarily close? Posted: 05 Feb 2017 07:50 AM PST A true-zero resistance would, to my understanding, cause problems with implementing Ohm's Law. Additionally, I believe there is still a non-negligible degree of Joule heating, which leads me to think that the resistance of the material is some fraction above true zero. [link] [comments]  |
| How far away from the nucleus does 100% of the electron cloud extend? Posted: 05 Feb 2017 01:08 PM PST The electron cloud is usually defined as the volume where between 90 and 97% of the electron resides. Using modeling software you can alter the parameter to see the cloud expand to 99% or 99.99%. Is there some portion (1X10-100000ish) of the cloud existing a meter away from the nucleus? How about a lightyear away? Can we use this for ftl communication somehow? Does quantum nature or the Plank length act as a limit to this idea? I've tried looking through physical chemistry and quantum physics literature before, but it was too far out of my field and I gave up. [link] [comments]  |
| How do stars generate elements "heavier" than lead? Posted: 05 Feb 2017 10:04 AM PST I know that all of the natural occurring elements are formed in the fusion reactions within stars. As I understand it (correct me if I am wrong), during the life cycle of early stars (the first generation after the Big Bang), as they burned through hydrogen and helium, their cores eventually became made of of large quantities of lead, making nuclear reactions impossible. The stars blow up, scattering their contents into space where that stuff is used in the formation of new stars, planets and all the other matter in the Universe. That accounts for all of our elements up to lead on the periodic table. Is it correct that some of the heavier (from Lithium to lead) elements that become part of new (second generation and beyond) stars are "fused" in the nuclear reactions in the star into elements beyond lead? Is there an established understanding of how the fusion of heavier elements (those heavier than H and He) are fused within a star? For example, do we know that lithium will only undergo fusion with certain other elements, or is it totally random? Thanks! edit -- I wrote lead when I meant iron. [link] [comments]  |
| Why does the US launch rockets in Alaska? Posted: 05 Feb 2017 08:30 AM PST I get that they could launch over the Pacific so they don't fly over people, but doesn't the equator have an easier time due to the faster rotation of earth? Is it for longitudinal orbits? Thanks. [link] [comments]  |
| Can a parasite change a human's genome? Posted: 05 Feb 2017 12:26 PM PST I'm writing a science-fiction novel, and I'm wondering if it would be possible for a parasite to take over a body and change it completely. I don't need to know whether or not a parasite exists that does this, but if, hypothetically, it's possible. And if it is possible, how would it go about changing human DNA? [link] [comments]  |
| What chemically defines an element as a metal? Posted: 05 Feb 2017 10:33 AM PST |
| How can alkenes be diastereomers and have diastereotopic protons? Posted: 05 Feb 2017 03:19 PM PST I thought diastereomers have to have chiral centers right? If you take a look at the diastereotopic example in the mastering organic chemistry website then it shows that the alkenes are diastereomers, but they dont have any chiral centers. http://www.masterorganicchemistry.com/2012/04/17/homotopic-enantiotopic-diastereotopic/ Also as an additional question, can alkenes have enantiomers or enantiomeric protons? [link] [comments]  |
| Posted: 05 Feb 2017 01:36 PM PST Nuclear, coal, gas, wind and solar thermal generation all heat water to create steam to drive a turbine. Are there any other ways of generating on a meaningful scale? Also has turbine technology peaked or are we likely to see more watts per volumetric unit of steam as technology advances? [link] [comments]  |
| Posted: 05 Feb 2017 09:43 AM PST |
| Posted: 05 Feb 2017 12:15 PM PST |
| You are subscribed to email updates from AskScience: Got Questions? Get Answers.. To stop receiving these emails, you may unsubscribe now. | Email delivery powered by Google |
| Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, United States | |
No comments:
Post a Comment