Why is it not E=1/2m c^2, like KE=1/2m v^2 ? Did Einstein leave off the 1/2? |
- Why is it not E=1/2m c^2, like KE=1/2m v^2 ? Did Einstein leave off the 1/2?
- What is the time uncertainty in the energy time uncertainty principle? How can we derive this from position and momentum uncertainty? How to calculate it since we do not have an operator for time?
- If an electron in an atom emits a photon but no lower energy orbital is available for it to drop to, does the electron leave the atom?
- Why are there no magnetic monopoles in existence but “monopolar” electric charges (protons electrons) exist?
- What is a water surface like at a molecular level?
- What is the medium between synapses? And what force if there is any, pushing neurotransmitters into receptors?
- What will happen to Earth when the Milky Way collides with the Andromeda galaxy?
- How come NASA's Opportunity rover lasted as long as it did?
- How exactly does a shock wave from an explosion kills you (assuming that you don't die due to heat and objects flying around)?
- How is actual temperature and “feels like” temperature determined on a weather app?
- What do the final days before Launch involve for Astronauts?
- If a reactor used weapons-grade material (plutonium, uranium, etc.), would an ensuing meltdown look like a nuclear bomb?
- What made the Chernobyl NPP design so flawed - and were there other nuclear power plants with similar design in the Soviet Union? Are there any in the world now?
- Why does PH affect bacteria life so differently in the gut versus the mouth?
- Why do people store their pH probes in distilled water?
- Does reading / close viewing actually affect or harm vision?
- How do single celled creatures heal their wounds if at all?
- Why does the spin imparted on a bullet by rifling continue once it has left the barrel?
- The North American Great Lakes are connected to the Northern Atlantic Ocean through the St Lawrence River, so why isn't the salinity level of the lakes higher?
- What happens when lightning strikes the ocean? Will the fish in the area be affected in any way?
- Can exposure to radiation ignite a flammable gas?
- Does NASA know exactly what went wrong with Opportunity? Why exactly she gave out?
- Why does the far side of the moon have less crater marks than the side facing earth? Wouldn’t earth’s gravity prevent that?
| Why is it not E=1/2m c^2, like KE=1/2m v^2 ? Did Einstein leave off the 1/2? Posted: 13 Feb 2019 07:58 PM PST |
| Posted: 14 Feb 2019 05:01 AM PST |
| Posted: 14 Feb 2019 08:06 AM PST I understand that if an electron absorbs a photon it can be excited to a higher orbital and the only way to drop back down is to emit a photon. My question asks if an electron is already at its lowest possible orbital and emits a photon, does the electron simply get knocked from the atom? Also would an electron that is in a higher orbital emit a photon naturally without any outside excitation in order to drop down and fill the lower orbitals? Or can photons only be emitted by outside excitation? [link] [comments]  |
| Posted: 13 Feb 2019 08:48 PM PST |
| What is a water surface like at a molecular level? Posted: 13 Feb 2019 10:02 PM PST Suppose that you have a glass container which is half-full of pure water at room temperature, sitting on a table, and there are no external sources of vibration (aside from thermal motion) from the table or surrounding air. Suppose that you could zoom in on the surface of the water almost to a molecular level and make measurements to judge the appearance of the water surface. I would like to understand as much as possible what this would be like and if and how it might be different from how we think of a water surface at larger scales. Would there be a sharply-defined water surface (at a molecular level) or a more-or-less gradual transition from liquid to gas? Would there be waves in the water and how big would they be? What role would surface tension play in the size of waves and the escape of water molecules into the gas phase? Would the appearance of the surface be dominated by the passage of molecules to and from the gas phase, or would these events not have such a great surface density? Thanks in advance for any help in clarifying this. [link] [comments]  |
| Posted: 14 Feb 2019 06:41 AM PST |
| What will happen to Earth when the Milky Way collides with the Andromeda galaxy? Posted: 14 Feb 2019 03:52 AM PST So in 4 billion years the Milky Way is going to collide with the Andromeda Galexy, but if for some reason that were to happen in our lifetime, how might it affect our planet/ solar system? [link] [comments]  |
| How come NASA's Opportunity rover lasted as long as it did? Posted: 14 Feb 2019 04:23 AM PST How come it went from an expected duration of 90 days to staying alive for 14 years? What did they expect would 'kill' the rover so soon? Why didn't this happen? [link] [comments]  |
| Posted: 13 Feb 2019 03:50 PM PST |
| How is actual temperature and “feels like” temperature determined on a weather app? Posted: 13 Feb 2019 11:32 PM PST On my weather app it says "feels like 56 degrees" but the actual temperature is 58 degrees. Is a formula used? [link] [comments]  |
| What do the final days before Launch involve for Astronauts? Posted: 14 Feb 2019 03:17 AM PST I've always maintained a semi-constant fascination for space-exploration. I always say I was born at the wrong time. As an average guy of average intelligence and average health, I can't explore space today. You need to be so exceptional in so many ways. Where's my personal space ship that can zip me across the galaxy at 45,000c??? But one can always dream. I did read one of Chris Hadfield's books, and I learned a lot about astronaut training, the different considerations physiologically, mechanically etc. as well as the stuff that happens during launch and once you're up there. One thing I never really got a sense of though, is what happens during those final 24-48h? What preparations do the astronauts go through? Vaccinations, final check-ups, routines, etc. Essentially, I'm asking, what and why is done to/by astronauts up to the point where they're strapped in? I'm still looking online but I'm not really sure where to begin. I'm on ESA's and NASA's websites at the moment. Youtube has been surprisingly disappointing. [link] [comments]  |
| Posted: 14 Feb 2019 08:25 AM PST |
| Posted: 14 Feb 2019 08:15 AM PST I was wondering if there are any other power plants built in a similar flawed fashion or at the very least if there used to be many of them and what happened since the disaster. Couldn't find the answer from a quick google. [link] [comments]  |
| Why does PH affect bacteria life so differently in the gut versus the mouth? Posted: 14 Feb 2019 08:08 AM PST Google "gut health, PH and bacteria" and the articles tell you that:
Google "oral health, PH and bacteria" and with some reading you will find that many articles will say something like:
So which is it? Why do bad gut bacteria like alkalinity and good gut bacteria like acidity, while bad mouth bacteria like acidity and good mouth bacteria like akalinity? [link] [comments]  |
| Why do people store their pH probes in distilled water? Posted: 14 Feb 2019 08:02 AM PST I have read that distilled water will strip the ions from the probe essentially causing them to be less effective over time yet every place I've ever worked has always kept the pH probes in distilled water when not in use. Wouldn't it be better to store it in a solution with more ions rather than less? [link] [comments]  |
| Does reading / close viewing actually affect or harm vision? Posted: 14 Feb 2019 08:02 AM PST I was listening to a podcast about a doctor who treated myopia and he asserted that focusing on objects close to the face put strain on the eye and could damage the muscles that adjust the lens because from an evolutionary perspective our hunter/gatherer ancestors would be adapted for primarily long-distance vision to see prey or look for danger, and short-range vision would only be used intermittently rather than for hours at a time reading books or some such. it was also asserted that glasses prevented natural focusing of the eye and would, over time, make the eye weaker and inevitably lead to stronger prescriptions due to further atrophy of the eye muscles. This all seems to make sense to me but I'm not a doctor. Is this largely nonsense or is there any real scientific support for this? [link] [comments]  |
| How do single celled creatures heal their wounds if at all? Posted: 14 Feb 2019 07:58 AM PST Multicelled creatures pretty much just replace the dead/damaged cells with new cells but what do the individual cells do to repair damage to their individual cell walls? Is it active or passive meaning do the molecules just link back together because of their physical qualities (polarity between water molecules and such) or do cells/Eukaryotes/prokaryotes/Archaebacteria have ways of actively repairing themselves? [link] [comments]  |
| Why does the spin imparted on a bullet by rifling continue once it has left the barrel? Posted: 14 Feb 2019 07:55 AM PST Why doesnt it just remain at its last point of rotation when it exited? [link] [comments]  |
| Posted: 14 Feb 2019 06:58 AM PST Are there salinity differences between say, Lake Ontario and Lake Superior? What processes effect the boundary between fresh and salt water? [link] [comments]  |
| What happens when lightning strikes the ocean? Will the fish in the area be affected in any way? Posted: 14 Feb 2019 03:08 AM PST |
| Can exposure to radiation ignite a flammable gas? Posted: 14 Feb 2019 06:21 AM PST |
| Does NASA know exactly what went wrong with Opportunity? Why exactly she gave out? Posted: 13 Feb 2019 06:46 PM PST |
| Posted: 13 Feb 2019 04:18 PM PST |
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