Would dominoes collapse faster on a planet with stronger gravity than Earths? |
- Would dominoes collapse faster on a planet with stronger gravity than Earths?
- In films depicting the Apollo program reentries, there’s always a reference to angle of approach. Too steep, burn up, too shallow, “skip off” the atmosphere. How does the latter work?
- Would a person who beat COVID-19 be immune to future deadly/serious case of COVID-19?
- Is there any protection from Covid-19 by "local" herd immunity?
- Do blue LEDs and OLEDs have to output more light to compensate for our relatively low sensitivity to blue wavelengths?
- Since pi is irrational and it is exactly the ratio between the diameter and circumference of a circle, shouldn’t either the diameter or the circumference be irrational?
- Why does smaller diameter of capillary increase rise of water?
- How do we know for sure that a species is extinct?
- How does blood stay in our organs? How does it feed them?
| Would dominoes collapse faster on a planet with stronger gravity than Earths? Posted: 07 May 2021 03:35 PM PDT |
| Posted: 08 May 2021 06:39 AM PDT Is the craft actually "ricocheting" off of the atmosphere, or is the angle of entry just too shallow to penetrate? I feel like the films always make it seem like they'd just be shot off into space forever, but what would really happen and why? Would they actually escape earths gravity at their given velocity, or would they just have such a massive orbit that the length of the flight would outlast their remaining supplies? [link] [comments]  |
| Would a person who beat COVID-19 be immune to future deadly/serious case of COVID-19? Posted: 08 May 2021 03:02 AM PDT |
| Is there any protection from Covid-19 by "local" herd immunity? Posted: 08 May 2021 05:33 AM PDT Even if the US never reaches vaccination levels high enough for herd immunity is there still some level of protection gained by living in a state that might reach 80% of it's population vaccinated? [link] [comments]  |
| Posted: 07 May 2021 11:12 AM PDT Preamble: I know from my physiology courses that the human fovea has around only 2% S-type cone cells, sensitive to wavelengths ~420nm. In Warren J. Smith's Modern Optical Engineering - The Design of Optical Systems. 3rd Edition, section 5.3 has a chart that states that, in photopic conditions, λ 420nm have a standard relative luminosity, V(λ), of 0.0040. Compare this with red λ 640nm V(λ) of 0.1750 and green λ 540nm V(λ) of 0.9540. Edit: Standard relative luminosity is also known as luminous efficacy. Useful terminology I do not have access to ISO 11664-1:2007 or ISO/CIE 11664-1:2019 to check for more recently evaluated values for wavelength specific sensitivity. Questions: In photopic light conditions do blue LEDs and OLEDs have to use more power to emit the same amount of perceived light as red or green? Is this why blue LEDs and OLEDs have a shorter lifespan than other colours? Are the semiconductor materials/dyes for blue wavelengths inherently less durable or is their durability tied to the greater amount of light they have to emit? [link] [comments]  |
| Posted: 07 May 2021 10:26 AM PDT PI is the exact ratio between the circumference and the diameter and since it is obtained by dividing these two numbers, pi should be rational, right? But it isn't rational, pi is irrational but we know that you can't get a irrational number by dividing 2 rational numbers(cause it could then be expressed in p/q) so is the diameter or the circumference of a circle irrational? [link] [comments]  |
| Why does smaller diameter of capillary increase rise of water? Posted: 07 May 2021 09:12 AM PDT |
| How do we know for sure that a species is extinct? Posted: 07 May 2021 11:34 AM PDT What are the criteria that must be met for these conclusions to be made? How do we not know that there aren't more of the species that we just haven't been able to find? [link] [comments]  |
| How does blood stay in our organs? How does it feed them? Posted: 06 May 2021 08:49 PM PDT Perhaps my searching skills are shity but I haven't found a single sketch of how exactly are our organs and cells (skin,liver, and the like... (except for the brain, at least that one I can imagine)) are connected to the circulatory system. I understand that my arm muscle cells need to constantly get new blood so to expel waste and receive new proteins\oxygen and etc, but how on earth is it connected to my capillaries? There are billions\trillions of sedentary cells in the human body (as opposed to cells which floats in our nutrition soup(blood)\lymph\ and etc), I doubt that each of them has its own feeding tube (blood vessel). I could imagine how in CERTAIN organs there could be like a membrane, a sack of cells with one tube to wash all of those cells with blood so the fluid still stays within the closed circulatory system, but : a)is it true? b) how does it work with other cells (like the skin or the muscles)? [link] [comments]  |
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