Did relativity HAVE to be discovered mathematically? Could we have discovered the exact equations empirically? Say from observing the difference in clocks on the ground vs on satellites |
- Did relativity HAVE to be discovered mathematically? Could we have discovered the exact equations empirically? Say from observing the difference in clocks on the ground vs on satellites
- What would happen if you were struck by a tic tac traveling ~1% the speed of light?
- Why aren't there pure ATP supplements available on the market as energy boosters? What would happen if you took these?
- Many people argue that First-Past-the-Post voting system is the worst. Arrow's theorem says that there is no perfect voting system. Is there a way to mathematically quantify the utility of a voting system, and if there is, then which one comes out on top?
- After watching a video flyover of Titan, I wondered how scientists delineate one pole as "north" and the other as "south" on non-earth bodies? Magnetism? Alignment with the solar plane? Other?
- If sucrose has a lower enthalpy of combustion than octane, why can't we / don't we use it as a fuel?
- Is ethanol the only alcohol that humans can tolerate because of enzyme specificity or the relative harmfulness of the products?
- What do intelligent mammals like primates do with their dead?
- Are there any genes whose expression is -not- regulated?
- Why does Mercury's solar transit ONLY happen every ~ 10 or so years?
- [Physics] Could a human swim in a column of water only supported by atmospheric pressure?
- How dense of a gravity field to bend a LASER around a circle 180 degrees?
- What did primitive humans used to sleep on?
- Why can I block most of the light when I hold my hand between me and a light source, but I can't block most of the sound when I hold my hand between me and a sound source?
- How loud (in DB) is a bullet in flight? Excluding the initial blast.
- Through the removal of the zona pellucida, could sperm from any animal fertilize an egg? And if so, how realistic are chimeras?
- Why don't physicists like to talk about the vacuum catastrophe?
- How far can you actually see when looking at the sky?
- Why would an increase in mean free path mean an increase in thermal conductivity?
- Why is a dust particle floating upward in my room?
- If protons & neutrons are each composed of 3 quarks, is the atomic nucleus just a jumble of quarks, or is each set of 3 quarks a distinct particle?
- Did the early universe have an escape velocity higher than the speed of light?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- Would you see better resolution in optic microscopes if you used purple LEDs for lighting?
| Posted: 04 May 2016 04:25 PM PDT |
| What would happen if you were struck by a tic tac traveling ~1% the speed of light? Posted: 04 May 2016 05:39 PM PDT |
| Posted: 04 May 2016 12:11 PM PDT As ATP is often referred to as the energy currency of the cell, what would happen if one ingested ATP capsules? Would the person experience an energy boost, or would it prove to be toxic? [link] [comments]  |
| Posted: 04 May 2016 08:30 PM PDT |
| Posted: 04 May 2016 09:56 PM PDT |
| If sucrose has a lower enthalpy of combustion than octane, why can't we / don't we use it as a fuel? Posted: 04 May 2016 09:03 PM PDT I understand there might be some technical difficulties with running engines on sugar, but if our bodies can utilize the energy why can't mimic their processes to run engines on sugar? [link] [comments]  |
| Posted: 04 May 2016 12:12 PM PDT Humans can only tolerate ethanol. Ethanol and NAD+ are converted to acetaldehyde and NADH by alcohol dehydrogenase. Acetaldehyde and NAD+ are then converted to ethanoic acid and NADH by aldehyde dehydrogenase. So is it that one (or both) of these enzymes is specific to two-carbon molecules, or is it that the by-products from a reaction with methanol, isopropyl alcohol, etc. are more potent in their toxicity? EDIT: I am guessing the former, because enzymes essentially lower the energy of the transition state by making hydrogen bonds and forcing molecules into a specific conformation. This means there isn't room for extra carbons because hydrogen bonds can only occur within a window of ~1 Angstrom (it's like 2-3 Angstroms away for an H-bond, I think). Wikipedia is not specific enough and the articles I'm reading don't address the physiology. Correct me on any of this. [link] [comments]  |
| What do intelligent mammals like primates do with their dead? Posted: 04 May 2016 05:46 PM PDT |
| Are there any genes whose expression is -not- regulated? Posted: 04 May 2016 10:09 PM PDT |
| Why does Mercury's solar transit ONLY happen every ~ 10 or so years? Posted: 04 May 2016 07:07 PM PDT I've always wondered why these are so rare: http://www.space.com/32784-mercury-transit-2016-sun-viewing-guide.html Is the irregularity of Earth and Mercury's inclination the reason why we don't see these more often? Mercury's orbital period is 88 Earth days, shouldn't alignments happen more often? Thanks for the explanation. [link] [comments]  |
| [Physics] Could a human swim in a column of water only supported by atmospheric pressure? Posted: 04 May 2016 07:25 AM PDT Here are the conditions: Pipe:
As far as I understand, the atmospheric pressure would be able to support a 10 m column of water according to basic hydrostatics. Now, could you enter this pipe from below and swim inside? It seems plausible on paper, but really fucks with my imagination. Tried to search google and reddit for the answer, but it is not an easy question to phrase for a norwegian. [link] [comments]  |
| How dense of a gravity field to bend a LASER around a circle 180 degrees? Posted: 04 May 2016 05:51 PM PDT I was thinking about bending light around a corner as an alternative to using a mirror. I was wondering how dense of a gravity field to bend light or space 180 degrees, as if the light beam orbitted a briefly-existing blackhole for half an orbit then flying straight out like a tangent. Parallel to initial entry direction. Note: that the diameter of the black hole should be the size of a golf ball. [link] [comments]  |
| What did primitive humans used to sleep on? Posted: 04 May 2016 06:32 PM PDT |
| Posted: 04 May 2016 03:09 PM PDT |
| How loud (in DB) is a bullet in flight? Excluding the initial blast. Posted: 04 May 2016 04:32 PM PDT Let's use the 5.56x45mm and 7.62x39mm as examples. The 5.56 has a faster velocity at 940m/s than the 7.62 at 730m/s and being lighter in weight as well. Assuming that they are fired from a M16 and an AKM, for all intent and purposes. Would the difference in mass and velocity create a difference in the amount of sound they create? How far would the sound travel while in flight? [link] [comments]  |
| Posted: 04 May 2016 07:37 PM PDT I know that some hamster chimeras have been created, but I'm more interested in animals "a bit" further from each other; for example crossing dolphins and whales. Would there be any viable combinations outside "naturally" occurring ones like Ligers (including combinations that lead to abnormalities, the animal just needs to not die)? Additionally, what possible genetic abnormalities would be seen? [link] [comments]  |
| Why don't physicists like to talk about the vacuum catastrophe? Posted: 04 May 2016 08:03 PM PDT I have been into physics for a long time but I never heard about this. I actually had to look for it ( before I knew it was a thing) to find mention of it. [link] [comments]  |
| How far can you actually see when looking at the sky? Posted: 04 May 2016 04:16 PM PDT I have been directed from r/AskReddit to post this question here. [link] [comments]  |
| Why would an increase in mean free path mean an increase in thermal conductivity? Posted: 04 May 2016 03:40 PM PDT If I'm understanding this correctly, mean free path is the distance an energy carrying molecule must go before a collision, which is when the energy is transferred. If the path is longer, wouldn't that mean energy is transferred less often or efficiently, making it a better insulator? [link] [comments]  |
| Why is a dust particle floating upward in my room? Posted: 04 May 2016 04:17 PM PDT I'm in an indoor room. The windows are closed. Doors are shut. No air is coming through the vents. But I see a dust/lint/feather/whatever particle floating upward toward the ceiling. How is it floating upwards? Why does it float upwards instead of gravity making it fall to the ground? [link] [comments]  |
| Posted: 04 May 2016 10:54 PM PDT https://en.wikipedia.org/wiki/File%3AQuark_structure_neutron.svg This graphic shows a neutron as a set of 3 quarks bound together with a 'shell' around them. This shell is presumably not an actual massive object (what would it be composed of after all?). But in an atomic nucleus, several (up to 100s) of these quark sets are combined together. Does each nucleon (proton and neutron) remain a distinct particle or is the nucleus simply a jumble of up and down quarks? If the former, what prevents quark sets (nucleons) from dissembling, moving around and mixing like atoms in a gas or liquid? If the latter, why even bother talking about protons and neutrons as an intermediate step? [link] [comments]  |
| Did the early universe have an escape velocity higher than the speed of light? Posted: 04 May 2016 02:10 PM PDT With my limited understanding of physics I would think that in the moments after the big bang, the escape velocity of the incredibly dense universe would exceed the speed of light. Applying my (again very very limited) understanding of physics that would mean that all the matter fell back into a singularity, while space itself would keep expanding practically empty. Why is this not the case? Was the space between quarks/early matter simply expanding fast enough that all the objects were effectively moving away at FTL speeds? [link] [comments]  |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 04 May 2016 08:05 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Would you see better resolution in optic microscopes if you used purple LEDs for lighting? Posted: 04 May 2016 07:44 AM PDT The idea is that the maximum zoom, (resolution) of an optic microscope is limited by the wavelength of the light, so under usual lighting the realistic maximum zoom, keeping the image crisp, is about 2000x. That is with with ideal oil submersion. My question is, since purple light has the shortest visible wavelengths, if you had purple LED lighting instead of white, would you be able to get better resolution images? If so, by how much? [link] [comments]  |
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