How do we actually know the number of protons in a nucleus/atomic numbers? |
- How do we actually know the number of protons in a nucleus/atomic numbers?
- What is the meaning when people say “99.99% the speed of light” instead of just speed of light?
- Are there any avian species that haven’t evolved significantly since the Cretaceous mass extinction event?
- How long does it typically take for a planet to form?
- Are there any jet aircraft that carry their own oxidizer?
- How Do Engineers Work Around Material Fatigue?
- Does an allergic reaction to an ingredient in a vaccine make the vaccine less effective?
- The electrostatic deflection of water, and Can a stream of water be deflected by a magnetic field?
- How is it possible for a river to dry up completely then go back to normal without a mass extinction level event?
- Why are congenital brain deformities(i.e. Alobar Holoprosencephaly, Anencephaly, Syncephalus) so deadly and if physically possible can current medical technology keep these children alive beyond a few hours?
- With Covid-19 boosters rolling out, are we seeing a drop in antibody titres in the months after the third shot just as we did after the second?
- If tectonic plate elevation causes mountains to form, why are there valleys between mountain ranges?
- Lots of products claim to "boost" or "speed up" your metabolism. Is that actually a thing that can be done, and if so, what's the science behind it?
- What is the general effect of exposing a plant to continuous illumination?
- What treatment(s) does the US do to its water that makes it safe to drink that other countries don't do?
- How does sound travel after breaking the sound barrier?
| How do we actually know the number of protons in a nucleus/atomic numbers? Posted: 24 Oct 2021 08:24 PM PDT I'm just curious as to the method by which atomic numbers for each element were discovered. We obviously don't have microscopes that can see down to that level, so it's clearly not known by direct visual means, but I've struggled to find a good answer through search engines. [link] [comments]  |
| What is the meaning when people say “99.99% the speed of light” instead of just speed of light? Posted: 25 Oct 2021 01:15 AM PDT I hear this phrase a lot and it doesn't make much sense to me. Since the speed of light is a big number, I know a lot can change in that last 0.01%, does something else significant happen when that transition is made? Also I know that in order to accelerate anything with mass to speed c, it would require infinite energy, but to accelerate to 0.9999c would that require finite energy? [link] [comments]  |
| Posted: 25 Oct 2021 05:39 AM PDT I know that the cassowary emerged around 60 M.y.a but do you know of any avian species that go back further, preferably pre Chicxulub? [link] [comments]  |
| How long does it typically take for a planet to form? Posted: 24 Oct 2021 10:13 PM PDT |
| Are there any jet aircraft that carry their own oxidizer? Posted: 24 Oct 2021 10:39 PM PDT I know that during normal operation jet aircraft use air compressors to scavenge oxidizer from the atmosphere, but I'm wondering if there's ever a use case for carrying extra oxidizer on a jet aircraft. For example, suppose you had a fuel system that could dump more fuel into the combustion chamber than the air compressor could manage, you could add extra oxidizer directly to the combustion maybe for a higher performance boost than would normally be possible with a purely air-breathing engine. Or for another example, what if an aircraft at very high altitude wasn't able to scavenge enough oxygen to fully generate the thrust it wanted/needed. [link] [comments]  |
| How Do Engineers Work Around Material Fatigue? Posted: 24 Oct 2021 11:25 PM PDT I've yet to see bridges, towers, or roller coasters taken apart to be replaced due to material fatigue, yet I've seen several machines taken apart and parts replaced when fatigue sets in. Even the shop i used to work at had the roof cross members replaced when they became fatigued (granted, these beams were over 100 years old). Even my machine's dies need replaced when you start having them flex more during bending due to fatigue. There doesn't seem to even be much information on fatigue and how it's calculated. So how is all of this stuff figured out, prevented, and compensated for? If you have any book suggestions on this subject, I'd appreciate the recommendation as well. [link] [comments]  |
| Does an allergic reaction to an ingredient in a vaccine make the vaccine less effective? Posted: 24 Oct 2021 02:48 PM PDT |
| The electrostatic deflection of water, and Can a stream of water be deflected by a magnetic field? Posted: 24 Oct 2021 12:20 PM PDT A thin stream of water may be deflected or 'bent' by an electrostatic charge, and this can be demonstrated with a charged object such as a comb, and a thin stream from a faucet. Questions: Would the deflection be larger if de-ionised water was used? Given that water is affected both by electrostatic charge and by gravity, why is the water apparently not also deflected by a very strong magnetic field, say from a powerful electromagnet or neodymium permanent magnet? [link] [comments]  |
| Posted: 24 Oct 2021 08:33 PM PDT So I was just reading up on some doomsday news and came across an article regarding the salmon stock in the Yukon River collapsing. I went and did some digging and came across another article saying it dried up within 4 days after glaciers retreated back in 2017. If thats the case shouldn't everything have died off? Also how did the river return to normal if the glaciers haven't magically gained new ice? I find this kind of stuff unfortunate but fascinating - any info is appreciated! [link] [comments]  |
| Posted: 24 Oct 2021 08:01 PM PDT |
| Posted: 24 Oct 2021 05:35 AM PDT I keep reading that we might find the boosters fade and that we could need to do them regularly etc - but there's little out there about how they are actually performing. Have meaningful patterns cropped up in the data, or is it too early to tell? [link] [comments]  |
| If tectonic plate elevation causes mountains to form, why are there valleys between mountain ranges? Posted: 24 Oct 2021 10:26 AM PDT I.e. why is it not a continuous line or 'spine' of mountain peaks? Is it because the tectonic plates are shattered beneath so collision causes more than one pieces to be elevated? Or is it that after they've formed a mountain, they move on and make another one a mile away, like a blunt knife pressing on dough? [link] [comments]  |
| Posted: 23 Oct 2021 04:11 PM PDT |
| What is the general effect of exposing a plant to continuous illumination? Posted: 23 Oct 2021 06:30 PM PDT I've seen some mixed results- some implying negative, some positive on the effect of constant light exposure on plants. Is the effect quite subjective to the species of plant, or can the trend be generalized? Can plants get "stressed" like animals do under constant light exposure-in a plant's physiological manner of stress, ofc. [link] [comments]  |
| Posted: 24 Oct 2021 09:55 AM PDT |
| How does sound travel after breaking the sound barrier? Posted: 23 Oct 2021 04:03 PM PDT As the title implies, how does the sound from a super sonic vehicle change after it's broken the barrier? Is there a significant difference in the way the waves travel/how the human ear perceives it? Does it change frequency? [link] [comments]  |
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