Can my 7 year old ask you about tornadoes? |
- Can my 7 year old ask you about tornadoes?
- Can my 7 year old ask you questions about volcanoes?
- Why is frame-dragging limited by the speed of light?
- How does the earth's axial tilt influence climate? If it is more tilted, is the overall climate at the poles warmer?
- Theoretically, would a significant (sci-fi significant) change in the density of rock etc of a planet and its layers be able to create significant gravitational differences in different places around a planet? (Providing the rock has different densities in different places)
- Why are superconductors used as thick bundles if they have 0 resistance anyway?
- How does the sun provide vitamin D?
- What is the difference between magnetic and electric fields?
- Why don't all gas pipe flows end up at sonic speed?
- How is the accuracy of a COVID-19 test determined (virus and antibody alike)?
- How is air regulated on the ISS? What concentrations of oxygen and other airs are used?
- Magma is molten rock under a planet's surface. Lava is molten rock that comes up through a volcano. Is there a technical/specific name for molten rock that originated on the surface, like a planet that hasn't cooled or the rock that melts from an asteroid impact?
- Can an unvaccinated dog who is shedding the rabies virus through saliva get vaccinated for the first time and not develop symptoms?
| Can my 7 year old ask you about tornadoes? Posted: 07 May 2020 09:57 AM PDT So my son has high functioning autism and he is obsessed with tornados. He is 7 and constantly pesters his mom and myself with questions. I know the basics but I am hoping that the more knowledgeable of you can provide more correct answers that I can simplify for him. And any other super cool facts wold be super appreciated! Tornados:
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| Can my 7 year old ask you questions about volcanoes? Posted: 07 May 2020 09:55 AM PDT So my son has high functioning autism and he is obsessed with volcanos. He is 7 and constantly pesters his mom and myself with questions. I know the basics but I am hoping that the more knowledgeable of you can provide more correct answers that I can simplify for him. And any other super cool facts wold be super appreciated! Volcanoes:
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| Why is frame-dragging limited by the speed of light? Posted: 06 May 2020 06:27 PM PDT One of the explanations I've seen for why black holes can't spin faster than c (at the event horizon) is that this would cause objects to be frame-dragged (frame-drug?) at superluminal speeds as seen by a distant observer. But frame-dragging is the warping of space, and as we see with the cosmological expansion of space and theoretical technologies like an Alcubierre drive, space itself isn't prohibited from moving faster than light relative to other areas of space and carrying matter along with it. [link] [comments]  |
| Posted: 07 May 2020 08:59 AM PDT I read that greater tilt in Earth's axis balances solar radiation over a greater surface area. Does this mean that if earth's tilt is greater, the north pole would be cooler? I thought that if the earth was more tilted the northern latitudes would be warmer since more ice would melt during the summer. Is this wrong? I'm not sure since then wouldn't more ice form during the winter too? I know that melting ice can lead to a cascading effect where more sunlight gets absorbed (the reverse for forming ice). Which process would be stronger, in this case? [link] [comments]  |
| Posted: 07 May 2020 05:40 AM PDT I'm currently theorizing some ideas for a story I'm planning on writing and I wanted to get the communities opinion on this, if I'm even in the correct ballpark! (This is all theoretical so aside from the impossibility of this forming naturally I wanted to query if it's possible theoretically) If the density of material in 1km2 (from the surface to the core of a planet) were (x) times more dense than in another would there be a number significant enough that gravity would be 2x or even 5x stronger? If not is there a way that this could occur on paper that would make any scientific sense for significant localised gravitational differences across a planet's surface? (Kind of like how earth has super small differences in gravity but much stronger and with more defined borders of strength) [link] [comments]  |
| Why are superconductors used as thick bundles if they have 0 resistance anyway? Posted: 06 May 2020 01:23 PM PDT In machines such as ITER I see thick bundles of superconductors. The only reason I know would be to increase cross section to lower resistance and thus allow more current at the available voltage. But resistance is 0 anyway, why does it need to be thick? [link] [comments]  |
| How does the sun provide vitamin D? Posted: 06 May 2020 02:52 PM PDT I read a little about what uv rays do to cholesterol, but I don't understand why we'd need the sun to "produce" vitamin D. If someone could explain the whole phenomenon a little bit more I'd appreciate. [link] [comments]  |
| What is the difference between magnetic and electric fields? Posted: 06 May 2020 01:00 PM PDT What exactly is the difference between magnetic and electric fields? I've got the impression it's basically the same thing accept electric fields are produced only by electricity and magnetic fields are produced by magnets (and electricity?). Could someone just explain it simply, preferably without using too complicated sciency words! Thanks. [link] [comments]  |
| Why don't all gas pipe flows end up at sonic speed? Posted: 06 May 2020 01:58 PM PDT According to the 1D models of compressible fluid flow, the effects of pipe wall friction and the effects of heat addition from the environment both drive a flow toward Mach 1 (i.e. the speed of sound). Whether the flow starts of supersonic (M > 1) or subsonic (M < 1), the M = 1 condition is the maximum entropy point. Wall friction will actually cause a subsonic flow of gas through a pipe to accelerate up to M = 1 (I still have difficulty wrapping my head around this). So why then don't we find that all gaseous flows through a pipe ultimately end up with sonic flow velocities? I also do not understand what happens after the flow reaches M = 1. The textbooks I've read just say "if there is still pipe length left or heat addition past the point of M = 1, then the inlet conditions must spontaneously change such that the flow reaches M = 1 at the end of the pipe." But they do not explain what these changes are or what mechanism enforces them. What if I am controlling the inlet conditions to be, say, a certain pressure? Then what happens at the end of a rough walled pipe if the flow reaches M = 1 in the middle? TL;DR: Entropy is maximized when a compressible fluid flow velocity through a pipe reaches the speed of sound. So why aren't all our natural gas pipelines carrying gas at the speed of sound? [link] [comments]  |
| How is the accuracy of a COVID-19 test determined (virus and antibody alike)? Posted: 06 May 2020 02:32 PM PDT So from my understanding, to determine the accuracy of a test, you have to rule out false negatives as well as false positives. False negatives should be easy as they can just test on people who have (or in case of an antibody test, already had) the disease. However, due to the large amount of asymptomatic infections, I can't wrap my mind around on how they'd determine those. If they test someone who didn't have symptoms and it tests positive, how do they know if they really had COVID-19 or if it's just a false positive? Are there other ways to determine this without testing people? [link] [comments]  |
| How is air regulated on the ISS? What concentrations of oxygen and other airs are used? Posted: 06 May 2020 10:45 AM PDT I was wondering how air the astronauts breath is regulated and made. Is the oxygen 21% like it is on Earth? Is there nitrogen? Other trace airs? I assume there's CO2 as they need to breath out. Anyway thanks in advance. [link] [comments]  |
| Posted: 06 May 2020 09:37 AM PDT |
| Posted: 06 May 2020 03:39 PM PDT I have tried googling this question and haven't found an answer. I wasn't sure if this was the right subreddit, but figured I would ask. Thanks! [link] [comments]  |
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