Why are microwave ovens made of metal but we can't put metal in them? |
- Why are microwave ovens made of metal but we can't put metal in them?
- Do animals have dopamine and serotonin?
- Why can every carnivore ear meat raw but humans need to cook it first?
- How massive can something get before collapsing into a spheroid?
- How is altitude measured on other planets if they don't have seas and hence they don't have a mean sea level?
- Why does a plucked string mainly vibrate at the fundamental frequency?
- How do we know for sure that there is molten lava in earth’s core?
- Why are some orbital resonances stabilize the bodies in them, but some are inherently unstable?
- If Adrenaline increases blood sugar levels, but inhibits Insulin secretion, how does the sugar that it promotes get inside muscle cells?
- How are Recommended Daily Amounts of micro & macro-nutrients determined?
- Cleaning Products that kill 99.9% of germs: are these not simply leaving the strongest 0.1% to survive and repopulate?
- How does silver nitrate work on wounds?
- Is there an object that floats on moving water but sinks otherwhise?
- What is the Terahertz Gap and why does it exist?
- Does the gravity of the moon have noticeable effects on the planet besides ocean tides?
- What happen if an astronaut becomes really ill on the ISS?
- Black holes are alway illustrated with their accretion disks around their equators. Is this necessarily the case?
- Are there ways to use Fourier analysis on periodic systems on chaos, double pendulum for example?
- Are there any major differences between the last couple interglacial periods? (MIS 1, 5, 11)??
- When a person has a stroke, are their internal organs affected?
- Is all human blood the same color, or will there be inconsistencies based on exactly what is in the blood/ blood type?
- When have coral reef been wiped out and come back?
| Why are microwave ovens made of metal but we can't put metal in them? Posted: 15 Apr 2019 03:15 AM PDT |
| Do animals have dopamine and serotonin? Posted: 15 Apr 2019 05:12 AM PDT |
| Why can every carnivore ear meat raw but humans need to cook it first? Posted: 15 Apr 2019 04:00 AM PDT |
| How massive can something get before collapsing into a spheroid? Posted: 15 Apr 2019 03:29 AM PDT |
| Posted: 14 Apr 2019 08:59 PM PDT |
| Why does a plucked string mainly vibrate at the fundamental frequency? Posted: 15 Apr 2019 04:03 AM PDT I understand that when a string that is fixed at both ends is plucked, stationary waves can be formed at wavelengths where the frequency is an integer multiple of the fundamental frequency, which is the lowest possible frequency that the string can vibrate at. Why does a string mainly vibrate mostly at the fundamental frequency, whilst the vibrations due to successive harmonics have less of an effect? What is the reason why vibrating at the lowest possible frequency is more preferable? [link] [comments]  |
| How do we know for sure that there is molten lava in earth’s core? Posted: 15 Apr 2019 05:03 AM PDT |
| Why are some orbital resonances stabilize the bodies in them, but some are inherently unstable? Posted: 15 Apr 2019 03:23 AM PDT With the 1:2:4 resonance of the Galilean moons, and 2:3 Neptune/Pluto resonance, you see that their resonance keeps their orbits stable. However with the Kirkwood Gaps you see that a resonance with Jupiter has a destabilizing effect. What determines whether a resonance stabilizes or destabilizes a system? [link] [comments]  |
| Posted: 15 Apr 2019 04:44 AM PDT Adrenaline suppresses insulin secretion, which in turn promotes secretion of glucagon. Adrenaline and Glucagon signal the liver to begin breaking down glycogen and secreting sugar, which raises blood glucose levels. But if Insulin secretion has been blocked, how does this glucose get into the muscles? Or is the glucose meant more for the brain which doesn't require insulin for glucose to enter the cells? Also, how does nicotine play into this? Myself and a few people who have not smoked for many years, but continued nicotine consumption via vaping, have noticed that the worse thing we can do is vape immediately after a meal. If we vape after a meal, we feel that extreme sugar crash fatigue. However, nicotine tends to be more uplifting when we haven't eaten for many hours. I'm certain this is connected, as Nicotine definitely promotes adrenaline secretion, which in turn suppresses insulin, and raises blood glucose levels. See: https://bpspubs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1476-5381.1966.tb01828.x [link] [comments]  |
| How are Recommended Daily Amounts of micro & macro-nutrients determined? Posted: 15 Apr 2019 04:46 AM PDT I know it's obviously only recommended but everyone is so different. It also leads me to ask do they vary in different parts of the world? If yes, is this due to differences in what people need in different parts of the world or are the recommendations just calculated/determined differently by different bodies? If no, should they? [link] [comments]  |
| Posted: 15 Apr 2019 02:30 AM PDT We see this in antibiotics (MRSA followed Methicillin by ~5 years, I read). Why does something similar not seem to happen in our households/environment? And if it does happen, are we not better off using soap and water, or just bleach? [link] [comments]  |
| How does silver nitrate work on wounds? Posted: 15 Apr 2019 05:05 AM PDT Silver nitrate is often used in the cautery of wounds in medicine. How does it do that? Is this a redox reaction? Is it exothermic? How does it work? What's the chemical reaction involved? [link] [comments]  |
| Is there an object that floats on moving water but sinks otherwhise? Posted: 15 Apr 2019 06:24 AM PDT |
| What is the Terahertz Gap and why does it exist? Posted: 14 Apr 2019 07:28 PM PDT "It is defined as 0.1 to 10 THz (wavelengths of 3 mm to 30 µm)" I gather we can do stuff below 0.1 THz and stuff above 10 THz, so what is it about this range that creates a problem? [link] [comments]  |
| Does the gravity of the moon have noticeable effects on the planet besides ocean tides? Posted: 14 Apr 2019 03:00 PM PDT |
| What happen if an astronaut becomes really ill on the ISS? Posted: 14 Apr 2019 08:58 PM PDT |
| Posted: 14 Apr 2019 02:12 PM PDT I know there have been a lot of black hole questions lately but now the megathreads are gone, I have another one! Here is a typical black hole render: https://i.imgur.com/GD9oIBw.jpg Like most renderings we see the accretion disk in a neatish ring and the energetic jets shooting out perpendicular to it. For a rotating black hole, is the accretion disk always around the equator, and the jets always emanating from the poles? I know that in Newtonian celestial mechanics, rings are a lower energy and more stable configuration than a spherical shell, which is why you end up with planetary rings rather than spherical shells, but in planet formation scenarios I had thought the only reason these rings (and Moons) tend to be at or near the equator of the planet is because of angular momentum preserved from the original dust cloud that formed the system (correct me if I'm wrong on this!). Presuming that matter can approach a black hole from nearly any angle, if accretion disks are indeed generally around a rotating black hole's equator, what forces are causing this? Is there some Newtonian answer I'm missing, or is it something related to frame dragging or some other effect in general relativity? [link] [comments]  |
| Are there ways to use Fourier analysis on periodic systems on chaos, double pendulum for example? Posted: 14 Apr 2019 11:03 PM PDT As I understand it, Fourier analysis lets you break down any sort of periodic function and look at all the waves that add up to it. In the simple double pendulum example, the system is only a combination of two periodic functions, so shouldn't Fourier be able to give you an easily predictable time evolution description? [link] [comments]  |
| Are there any major differences between the last couple interglacial periods? (MIS 1, 5, 11)?? Posted: 14 Apr 2019 04:18 PM PDT |
| When a person has a stroke, are their internal organs affected? Posted: 14 Apr 2019 04:54 PM PDT When someone suffers a stroke in one hemisphere of their brain I understand that the opposite half of the body can lose muscle activity due to the death of motor neurons. Are their internal organs affected too? Will one side of their gut lose the ability of peristalsis? Will their lungs/diaphragm be affected similarly? [link] [comments]  |
| Posted: 14 Apr 2019 09:27 PM PDT |
| When have coral reef been wiped out and come back? Posted: 14 Apr 2019 08:17 PM PDT In response to another question about a warmer Earth and its effects on coral reef, a flaired poster mentioned that coral reef have come and gone in the past. Can anyone provide more information on this? When did this occur; how does this occur?
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