Which planet has the best "moonlight"? |
- Which planet has the best "moonlight"?
- What happens to noise energy once you can no longer hear the noise?
- What is the difference of de Broglie's wavelength as opposed to the regular formula?
- How can an electron have a positive and negative spin?
- How far in a body of water can soap break surface tension? What's happening in-between no surface tension and where it reforms?
- How do flu epidemics start? Is there a "Patient 0"? Is it some other mechanism?
- Does electrical current have something similar to a water hammer?
- Is there a link between Acute Hemopericardium and a high level of Potassium in a deceased person?
- I've noticed when I observe a gorilla, or monkey, they walk on their knuckles and feet, but they're classified as bipedal. Why is this the case?
- If you put multiple wind turbines one behind the other pointed the same direction and the air was hitting them perfectly would each successive turbine produce less energy than the previous?
- Timescale of Nebula formation?
- What was special about Polio that allowed its vaccine to be taken orally instead of by injection?
- Why is it difficult to make very dense liquid?
- Have humans influenced bird whistling with music?
- What causes the phospholipids that make up the plasma membranes to bond together?
- How do black holes lose mass?
- Why do plane contrails create 'smoke rings'?
- How is it possible that a vaccine has x% efficacy preventing severe illness, but less than x% efficacy when preventing mild illness?
- What is the difference between gravitational waves and (hypothetical) gravitons?
- Why does the pressure need to be low in fluorescent tubes and cathodic tubes?
- Why is PSI used as a measurement of for liquid form fluids?
| Which planet has the best "moonlight"? Posted: 08 Feb 2021 11:46 PM PST Now I know most planets with satellites (in our solar system) are gas giants with no real atmosphere. So they are unlikely to have any "night sky" at all. But I just want to confirm this [link] [comments]  |
| What happens to noise energy once you can no longer hear the noise? Posted: 09 Feb 2021 01:46 AM PST Does it just become very spread out noise that we can't hear, or does it turn into something else like heat? [link] [comments]  |
| What is the difference of de Broglie's wavelength as opposed to the regular formula? Posted: 09 Feb 2021 01:48 AM PST So I get that de Broglie came up with the idea of λ = h/p One thing I can't get into my mind is how does this differ from the regular formula λ = v/f? Obviously the formulas differ since the first one relates momentum and the wavelength. But if I had a ball, and were asked to measure the wavelength (which it does have since everything behaves like a wave and a particle), will I get the same result if I used either? I tried solving this for photons (measuring their wavelength), and I got 2 totally different answers. I tried to measure the wavelength of a ball by using both too, but since h is so small, I get 2 totally different answers. Why is this? When should I use which formula? [link] [comments]  |
| How can an electron have a positive and negative spin? Posted: 09 Feb 2021 06:23 AM PST I am in eleventh grade and we are just introduced to the concept of quantum numbers so my question may sound very stupid as I don't fully understand quantum numbers and I am still very new to it🙏🙏 If I have my facts right, spin quantum numbers are used to calculate the spin of an electron and if the electron spins clockwise it is given a certain positive value and if it spins anticlockwise it is given a negative value But If you look at a electron (spinning clockwise) from the opposite side it rotates anticlockwise. So does it not have a negative value from one side and a positive value from the other side? [link] [comments]  |
| Posted: 09 Feb 2021 05:17 AM PST So if you're to put some soap in a sink, the whole surface tension of the water is gone. But if you were to theoretically put the same amount in a body of water the size of the ocean, surely it couldn't break the entire surface tension of the ocean. How far does the broken surface tension reach, and how could it reform while having a hole in the middle of it? My question is assuming no turbulence in the water, not the actual ocean, but a huge still body of water [link] [comments]  |
| How do flu epidemics start? Is there a "Patient 0"? Is it some other mechanism? Posted: 09 Feb 2021 03:40 AM PST As per the title. I've wondered whether flu pandemics just start from a mutation of the existing flu, or is it something that's introduced from outside the species and finds humans an amenable host. [link] [comments]  |
| Does electrical current have something similar to a water hammer? Posted: 08 Feb 2021 08:07 PM PST I understand that electrical current is the flow of electrons through a conductor. It is often compared the water flowing through a pipe. When water is rapidly shut off it can cause a water hammer. Does something similar happen when electrical current is rapidly stopped? [link] [comments]  |
| Is there a link between Acute Hemopericardium and a high level of Potassium in a deceased person? Posted: 08 Feb 2021 02:06 PM PST My father died 4 years ago and the toxicologist couldn't figure out how there was a high level of Potassium in his body, I was wondering if anyone knows? [link] [comments]  |
| Posted: 08 Feb 2021 07:34 PM PST |
| Posted: 08 Feb 2021 07:10 PM PST I understand that some of the wind would be deflected slightly where the blade is at, but for the most part I feel like the wind column would go straight through the blades, so if another one was behind it how would it affect its energy output? Any insight is appreciated, I've been curious about this for a really long time. Thanks! [link] [comments]  |
| Timescale of Nebula formation? Posted: 08 Feb 2021 05:22 PM PST Basically title; for instance we're due to see the supernova of Betelgeuse in around the next million years, and we will be able to see that happen and watch whatever happens afterwards. If that's a nebula forming , what sort of timescale does it happen over ? Like how long does it take for the supernova to end and the nebula to be fully formed ? I'm unsure of the timescale of the end of a stars life and what happens afterwards if anyone could tell me that would be epic thanks. [link] [comments]  |
| What was special about Polio that allowed its vaccine to be taken orally instead of by injection? Posted: 08 Feb 2021 03:59 PM PST I assume if it were possible for say, the flu, we would be doing that by now. But I've heard that the polio vaccine was commonly administered by sugar cube to my parents' generation. [link] [comments]  |
| Why is it difficult to make very dense liquid? Posted: 08 Feb 2021 01:59 PM PST I was reading this article, article in question , today about energy storage using a very dense liquid instead of water as the fluid that is used. In this case it's 2.5x more dense than water and there for the supposed benefit is that your facility can be smaller and not as high. I looked up more about heavy liquids and was surprised on how few there were and how they didn't really get much about 3x the density of water. wiki list of them I appreciate that there is a saturation point that's reached with water but was surprised there were not other liquids that could achieve more. So Q's what's stopping there being readily available heavy liquids that are 4,5,6 x as dense as water [link] [comments]  |
| Have humans influenced bird whistling with music? Posted: 08 Feb 2021 11:30 AM PST Is there any evidence of music being an influence on bird calls where the patterns would mimic the music of their surrounding area? I remember reading an article years ago about how birds from different areas have had their call patterns influenced by the music surrounding them. An example was how birds living in urban setting followed something that resembled a sort of hip-hop beat. I could not remember if it was an actual article or something from a website which is the main reason I am asking. [link] [comments]  |
| What causes the phospholipids that make up the plasma membranes to bond together? Posted: 09 Feb 2021 12:12 AM PST Are the phospholipids even chemically bonded? Is it the cytoskeleton that holds the membrane together? I put chemistry as the flair because I assume it's a chemical force hold the phospholipids of the plasma membrane of a cell together, but I have no idea. [link] [comments]  |
| Posted: 08 Feb 2021 06:36 PM PST I saw something about Hawking Radiation and it's effects on black holes. It describes a scenario by which black holes can decrease in mass by the spontaneous formation of pairs of particles; one of these particle has mass and the other has negative mass. Usually these particles annihilate each other shortly after their formation but when this event occurs near the event horizon of a black hole it is possible for the particle with mass to escape and be observed as radiation, and the negative mass (anti-mass?) particle can "fall" in to the black hole and decrement the black hole's mass. My question. If events beyond the event horizon can not be said to ever actually occur in the timeline of an outside observer, then how can any of this activity ever take place? And how could we observe a black hole losing mass by some mechanism taking place beyond the event horizon? Perhaps I'm misunderstanding this and this action is actually taking place "outside" the black hole in the mass that I assume we would see smeared around the cusp of the event horizon (matter that has been "captured" by the black hole after it's formation). But if that is the case, is it true that all of a black hole's mass actually resides in some sort of sphere just outside the event horizon? That doesn't sound correct either. I assumed this Hawking Radiation effect was taking place on the "singularity's" mass, "inside" the black hole. Again though, perhaps I am fundamentally misunderstanding something. [link] [comments]  |
| Why do plane contrails create 'smoke rings'? Posted: 08 Feb 2021 04:27 PM PST Was reading this article from Scientific American that tries to explain the rare phenomenon of vortex rings appearing in plane contrails:
After skimming through a wikipedia article on vortices (the 'Crow Instability' one is a stub), I gathered that 'rings' or vortices are formed when a fast moving fluid meets resistance against a slower moving one, so that the friction in the interface between the two creates the vortex. I do not understand what symmetrical sinusoidal oscillations have to do with the formation of vortex rings. And if turbulence is all that is required, why doesn't one see 'ring contrails' more often? [link] [comments]  |
| Posted: 08 Feb 2021 09:50 PM PST Is being able to prevent mild not a prerequisite to preventing severe? [link] [comments]  |
| What is the difference between gravitational waves and (hypothetical) gravitons? Posted: 08 Feb 2021 09:24 AM PST When gravitational waves were first detected, I had the intuition to compare them to gravitions in the same sense that electromagnetic waves are photons. Are gravitational waves a large amount of gravitons, of which we are unable to detect the single quanta, or are they fundamentally different? [link] [comments]  |
| Why does the pressure need to be low in fluorescent tubes and cathodic tubes? Posted: 08 Feb 2021 01:53 PM PST |
| Why is PSI used as a measurement of for liquid form fluids? Posted: 08 Feb 2021 08:27 AM PST My understanding of gasses and liquids are this: gasses are inherently compressible. I can take 2 cubic feet of air and stuff it into 1 cubic foot of volume. Liquids are, from what I've gathered and been taught, not compressible, or at least not very compressible. However, in my time in the Navy, we had fireman loops that ran at designated pressures that didn't discharge. If only 1 cubic foot of volume can house 1 cubic foot of water, how is it that the water can exert a force on housing its in? Does this make sense? I can try and elaborate it it doesn't. [link] [comments]  |
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