Do humans have a vestigial tail wagging response? Is it detectable? |
- Do humans have a vestigial tail wagging response? Is it detectable?
- LIGO/VIRGO Gravitational Wave Megathread
- Where do photons come from? When I, for example, set a log on fire, were the photons that come flying out of it always there and are being released now or are they being newly created?
- How are roads designed on irregular terrain?
- Why do professional cameras only have one lense when the new phones have 2 lenses?
- What distinguishes mammalian cells from bird, reptile, fish etc cells?
- Calculating the time dilation for an object inside a black hole returns imaginary values, does this have a deeper meaning?
- Do stars fuse elements heavier than iron?
- How are x-rays produced? And how harmfull is it's exposure?
- What is the smell that metal smells? Is it actual metal that gets up your nose, or is it some effect the metal have on the air?
- What does it really mean that the electromagnetic force and weak force converge at high energies?
- Air has weight. Does this mean that, in theory, it would be slightly cheaper to launch manned space missions with astronauts wearing suits / air masks, as opposed to having a pressurized capsule?
- Why is the average atomic mass compared to the carbon-12 isotope?
- How do we measure redshift on cosmological scales?
- Is there a hard limit to the viscosity of a fluid before the Stokes-Einstein equation breaks down?
- Is it possible to boost the speed of sound up to the speed of light?
- Is it possible to have an infinite number of rainbows?
- What happens if you build an element that is not on the periodic table?
- Do photons going at exactly the speed of light violate the Uncertainty principle?
- How much did scientists know about the makeup of other planets in our solar system prior to spectroscopy?
- To what extent would it be possible to abandon a nuclear power plant?
| Do humans have a vestigial tail wagging response? Is it detectable? Posted: 28 Sep 2017 03:47 AM PDT |
| LIGO/VIRGO Gravitational Wave Megathread Posted: 27 Sep 2017 09:24 AM PDT Hi everyone! We have an announcement from the LIGO/VIRGO collaborations starting at 12:30 ET (1630 UT). We'll make sure to keep you up to date as the news comes out. Ask your gravitational wave (GW) questions here! Announcement streams: Useful links: EDIT: It's a joint LIGO and VIRGO detection! This adds even more credibility to these detections. The paper is public here. Properties:
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| Posted: 28 Sep 2017 02:37 AM PDT |
| How are roads designed on irregular terrain? Posted: 28 Sep 2017 02:30 AM PDT How is the placement of the road decided in a way that takes into consideration the environment and also vehicle performance? How does this vary for cars, roads for different purposes and train tracks? I imagine some 3D computer software is used, but what kind of variables does this software take into account? [link] [comments]  |
| Why do professional cameras only have one lense when the new phones have 2 lenses? Posted: 28 Sep 2017 08:35 AM PDT For optimal quality photos, i would imagine professional cameras to have every possible feature. Or is the dual camera on smartphones just a marketinf trick to fool the consumers? Extra points if you awnser why there are no dual lense space telescopes. [link] [comments]  |
| What distinguishes mammalian cells from bird, reptile, fish etc cells? Posted: 27 Sep 2017 05:18 PM PDT I read a lot about things tailored to mammalian cells in the literature, presumably because you can use them to test things meant for humans and not for E. coli. But how different are mammalian cells from other classes of animals, at the cellular level? Are the cytoskeleton components and whatnot different? [link] [comments]  |
| Posted: 28 Sep 2017 06:47 AM PDT Or is it just a quirk of the math? Probably doesn't mean anything because no outside observer can see any objects crossing over the event horizon anyways, but it's still interesting. Using the t0 = t1 * sqrt(1 - GM/rc²) formula for non-rotating spherical masses. [link] [comments]  |
| Do stars fuse elements heavier than iron? Posted: 28 Sep 2017 05:58 AM PDT Before everyone jumps in about how elements below iron undergo fusion, and above them they can undergo fission, everyone knows that. But in the conditions of the core of a star, could it be that elements heavier than iron are being created, even though it takes an excess of energy? There is LOTS of energy around, and lots of pressure, could it be happening? [link] [comments]  |
| How are x-rays produced? And how harmfull is it's exposure? Posted: 28 Sep 2017 09:08 AM PDT |
| Posted: 27 Sep 2017 03:15 PM PDT |
| What does it really mean that the electromagnetic force and weak force converge at high energies? Posted: 27 Sep 2017 09:02 AM PDT I did my undergrad in physics at MIT, so I'm pretty solid on quantum mechanics and E&M, but I've never had a good intuitive understanding of what it means that the electromagnetic force and weak force converge at high energies (the eletroweak force). I've encountered this idea in pop-science books and it was touched on in classes, but I'm hoping someone here can explain it more. (and if possible, explain symmetry breaking and the role that photons and quarks play in these two forces) [link] [comments]  |
| Posted: 27 Sep 2017 08:27 PM PDT Sorry if Engineering isn't the appropriate flair. I wasn't sure exactly what to classify this as. [link] [comments]  |
| Why is the average atomic mass compared to the carbon-12 isotope? Posted: 28 Sep 2017 05:48 AM PDT |
| How do we measure redshift on cosmological scales? Posted: 28 Sep 2017 12:50 AM PDT Redshift/blueshift, as I understand, is not too difficult to see at close scales (the earth and close stars) because we can use parallaxes to infer distances and therefore temperature and spectra. What confuses me is with astronomers like Hubble, how did they know far out objects were redshifted and not simply redder? I guess the same goes for blueshift; how do we know something is coming closer vs actually energetic and blue? [link] [comments]  |
| Is there a hard limit to the viscosity of a fluid before the Stokes-Einstein equation breaks down? Posted: 27 Sep 2017 03:37 PM PDT This question refers to Dynamic Light Scattering. My peers and I are trying to measuring Au particles in the 5nm range but have had no luck. One theory we had was to use a more viscous fluid to increase the time scale. I have found one source claiming 3mPas to be the soft-limit where fluids begin to inhibit Brownian motion to the point where the Stokes-Einstein equation can no longer be reliable but I have not found any other sources or studies confirming this empirical observation. [link] [comments]  |
| Is it possible to boost the speed of sound up to the speed of light? Posted: 27 Sep 2017 01:51 PM PDT |
| Is it possible to have an infinite number of rainbows? Posted: 27 Sep 2017 02:26 PM PDT I went to a lecture on rainbows and remember the guy talking specifically about how secondary rainbows are made through repeated total internal reflection and was wondering if by some chance this could be repeated over and over could this make an infinite number of rainbows? [link] [comments]  |
| What happens if you build an element that is not on the periodic table? Posted: 27 Sep 2017 03:47 PM PDT What happens if you build an element (putting protons, neutrons, electrons, etc.) that is not on the periodic table? Will a reaction occur that make it turn into a "proper" element? [link] [comments]  |
| Do photons going at exactly the speed of light violate the Uncertainty principle? Posted: 27 Sep 2017 04:58 PM PDT Since the uncertainty principle says that a particle cannot have a precise position and a precise velocity, how can a single photon go at exactly the speed of light? Is a single photon, due to its exact speed, everywhere in the universe? [link] [comments]  |
| Posted: 27 Sep 2017 09:45 AM PDT |
| To what extent would it be possible to abandon a nuclear power plant? Posted: 27 Sep 2017 12:54 PM PDT Could they just offload the fuel, rip out and dispose of any parts of the plant over a certain level of radioactivity, and walk away? In a typical water-type reactor installation, how much contaminated equipment is there really? [link] [comments]  |
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