Question about whale blow hole muscles: are the muscles designed to keep the blowhole open or closed? Does it take more muscle to open? |
- Question about whale blow hole muscles: are the muscles designed to keep the blowhole open or closed? Does it take more muscle to open?
- Why are their salts, sucrose and cholesterol in the covid vaccine?
- How are Protons and Neutrons spherical when they're made up of three Quarks?
- What actually is a torque?
- The forthcoming 'great conjunction' - does it tell us anything we don't already know?
- Digging a hole through earth and jump through it, you will be back in 90 minutes. 90 minutes is also the time for a low-earth orbit. Coincidence or does this happen for every object?
- Is there any substantial evidence to support the notion that house cats take on the personalities of their owners?
- Is there a liquid that's safe to drink, that contains no amount of H20?
- What aspects of a pathogen does our body use to generate an immune response? Is it usually one protein or does our body usually look at multiple components?
- How cold can a lithium ion battery get before it causes permanent damage or permanent loss of performance?
- What was the process used to capture the supermassive black hole at the center of Messier 87?
- Now that there are more than one covid vaccines out, how fast can another drug company create a generic one?
- In a 4-stroke engine, after the combustion stroke completes, is the combustion chamber pressure higher than atmospheric pressure? (And isn't that extra pressure a source of wasted energy/inefficiency?)
- Are bullies more successful in life than bullied people?
- Can Dogs sense the direction of an animal trail?
- Epidemiology of the latest COVID surge... How did this happen?
- How does type II diabetes lead to atherosclerosis?
- Is the Adrenal gland also transplanted in a Kidney transplant?
- Chernobyl Disaster - Fission without Moderator?
- If vaccines don't fully take effect within 2-3 days of administration, why don't we continue to have physical effects such as fever until the immune system has reached it's goal?
- Giving covid vaccine to someone that covid positive?
| Posted: 17 Dec 2020 06:07 PM PST |
| Why are their salts, sucrose and cholesterol in the covid vaccine? Posted: 17 Dec 2020 02:38 PM PST Just saw the list of ingredients in a subreddit and it made me wonder. Does anyone have the answer? Edit: typo in the post. I meant "why are there salts.." thanks for all the answers! [link] [comments]  |
| How are Protons and Neutrons spherical when they're made up of three Quarks? Posted: 18 Dec 2020 07:17 AM PST |
| Posted: 17 Dec 2020 03:32 PM PST So I ask this question at the risk of sounding stupid, but I haven't been able to find something that answers my question. Either that or I just don't get it. I' ve taken physics (and did well) and understand how to calculate torque. I understand that it is an applied force that changes rotation about an axis. My question is what actually is the resultant vector? We know it is perpendicular and can find the direction, but what significance does that have? How does it help us understand motion? I just don't get it. Does it help predict motion? Am I overthinking it or is it talked about more in more advanced courses? [link] [comments]  |
| The forthcoming 'great conjunction' - does it tell us anything we don't already know? Posted: 18 Dec 2020 05:01 AM PST Along with many others I'm looking forward to seeing the conjunction of Jupiter and Saturn in the next few nights. The last one was 400 years ago but couldn't really be observed as it was too close to the sun. Will this one, or similar conjunctions, be useful for any sort of scientific work or will it just be a curiosity with some public interest benefit? [link] [comments]  |
| Posted: 18 Dec 2020 12:56 AM PST So Neil DeGrasse Tyson claims that, when you drill a hole through earth and you throw something in it, it will pass its core get out of the other side and when no one grabs it, it will fall back to the "thrower" in 90 minutes. I have a few questions about this: - How does it have all the energy to get back to its initial position? Shouldn't it be slowing down once it's pass the core and never get out completely of the other end of that tunnel? Same with the pendulum experiment it will not come back to you if you just let it drop. On top of all that, wouldn't air resistance also slow it down? I think NDT means without air resistance. - How come both things (orbit and through hole) take 90 minutes? Is this a coincidence or does this also occur for the moon? the sun? (I know not 90 minutes but the thing through hole and an orbit)? Heres NDTs video: https://www.tiktok.com/@neildegrassetyson/video/6891365019183746310?lang=en thanks guys. [link] [comments]  |
| Posted: 17 Dec 2020 06:00 PM PST |
| Is there a liquid that's safe to drink, that contains no amount of H20? Posted: 17 Dec 2020 11:07 AM PST |
| Posted: 17 Dec 2020 03:24 PM PST I am trying to understand the mechanism and implications of the mRNA Covid vaccine and wondering about this basic concept of its mechanism. I'm curious, is one protein normally what our body would use to generate an immune response, or do traditional vaccines or organic pathogens usually have multiple other characteristics our body identifies in the immune process? [link] [comments]  |
| Posted: 17 Dec 2020 09:12 AM PST I live in Canada and am concerned about leaving lithium-ion powered tools in the shed and garage over winter. Found a lot of info on the internet about poorer performance at freezing temperatures, but nothing about long term effects after exposure to freezing temperatures. [link] [comments]  |
| What was the process used to capture the supermassive black hole at the center of Messier 87? Posted: 17 Dec 2020 05:45 PM PST |
| Posted: 18 Dec 2020 02:08 AM PST |
| Posted: 17 Dec 2020 02:16 PM PST Walking through the process that a four stoke engine follows: 1.) Intake stroke - the piston moves from the top to the bottom, while the intake valve is open. This draws the fuel/air mixture into the chamber. 2.) Compression stroke - the intake valve closes, and the piston moves back to the top of the chamber, thereby compressing the fuel/air mixture. 3.) Combustion stroke - a spark ignites the compressed fuel/air mixture which combusts, forcing the piston back down to the bottom. At this exact moment, once the piston reaches the bottom at the end of the combustion stroke, but before the exhaust valve has opened: The pressure in the combustion chamber must be higher than the atmospheric pressure. The volume of the cylinder is the exact same as the instant between the intake and compression strokes, but now, the temperature is much, much higher. So by The Ideal Gas Law (PV=nRT), the pressure must be higher, correct? If that's true, then in the next instant, when the exhaust valve opens at the start of the exhaust stroke, that extra pressure in the chamber is vented to atmosphere. This seems wasteful and inefficient to me. That's pressure that could otherwise have been used to push the piston, right? Now, I understand that the piston already reached the bottom of its range, so it can't be pushed any further. But to eliminate this 'wasted' pressure, couldn't we have initially (on the intake stroke,) filled the chamber with slightly less of the air/fuel mixture? This could be accomplished by leaving the intake valve open for the first part of the compression stroke. So some of that air/fuel mixture is forced backwards. Then, as the compression stroke continues, the intake valve closes and compression begins. But this time, the compression ratio is slightly less since the starting volume (the volume when the chamber was sealed) is less than the full volume of the chamber with the piston at bottom dead center. Continuing on in the cycle, the piston reaches the top, where combustion occurs which forces the piston back down. As the piston moves down, the volume in the chamber is increasing, and thus the pressure is decreasing. This time however, we have only filled the chamber with enough combustible material to force the piston to the bottom of it's cycle, just as the chamber pressure reaches atmospheric pressure. Then the exhaust valve opens, and the piston rises to expel the exhaust. Wouldn't what I have described here, be theoretically more fuel efficient compared to the conventional method of compressing the full volume of the chamber during the compression stroke? [link] [comments]  |
| Are bullies more successful in life than bullied people? Posted: 17 Dec 2020 05:19 AM PST |
| Can Dogs sense the direction of an animal trail? Posted: 17 Dec 2020 01:23 PM PST When I'm walking my dog in the woods, she'll find an animal trail and follow it. As she doesn't find trails everywhere, presumably it is "fresh" - an hour? minutes? How long are animal trails followable? I have trouble believing there is enough of an odour gradient to provide direction... is there? What is being left behind by the animal (deer?) that makes it followable - something transferred from hooves? [link] [comments]  |
| Epidemiology of the latest COVID surge... How did this happen? Posted: 17 Dec 2020 08:16 AM PST I have yet to find a good answer to the question of how the latest COVID surge has happened. Mask wearing, social distancing, restricted travel, and increased hand washing have been the norm the world over. How are case rates and death rates soaring almost everywhere in the world simultaneously when all these precautions have been in place for almost the entire year and become part of daily life. Please help me understand. Thank you! [link] [comments]  |
| How does type II diabetes lead to atherosclerosis? Posted: 17 Dec 2020 12:51 PM PST How does hyperglycaemia lead to atherosclerosis? Also, does hyperglycaemia lead to hypertension? Thanks! [link] [comments]  |
| Is the Adrenal gland also transplanted in a Kidney transplant? Posted: 17 Dec 2020 11:31 AM PST Since the adrenal gland sits on the kidney, what happens to the adrenal gland of the donor and of rhe recipient? Can humans do with one adrenal gland like we can do with one kidney? [link] [comments]  |
| Chernobyl Disaster - Fission without Moderator? Posted: 17 Dec 2020 12:38 PM PST So I'm watching the HBO series about Chernobyl which has made me read a bunch about nuclear plants and how they work - this has lead me to a series of questions that I can't seem to find answers for, which may mean they're not good questions. My understanding is that U-235 nuclear fuel is pretty safe even in its enriched form because there's no neutron moderator present to slow down the emitted neutrons to an energy level conducive of causing fission, right? I have a vague understanding of why the core exploded, but once the explosion happened the fuel and the moderator are both scattered at great distances atomically speaking, and I would think that the open-air would bring down the temperatures of the exposed core. Why did the fire carry on with such intensity and why weren't they able to put it out? If they were putting boron and sand on the core, that would suggest it was a continued fission reaction and they were trying to absorb the neutrons to stop that reaction, right? Without the moderator present, how could the reaction take place as it did? If fresh nuclear fuel can be manipulated by hand (I've read refueling happens by hand with special tools), what makes it so dangerously radioactive when the core is exposed? [link] [comments]  |
| Posted: 17 Dec 2020 08:01 PM PST I've long heard that certain vaccines don't "take effect" until weeks after administration. My understanding is that the immune system is building immunity during this time. What keeps us from having physical symptoms while this is going on? [link] [comments]  |
| Giving covid vaccine to someone that covid positive? Posted: 17 Dec 2020 12:24 PM PST What would happen if you gave the coronavirus vaccine to someone that is positive for coronavirus? Would they get better or the vaccine wouldn't do anything because it's too late? Edit to title - that's [link] [comments]  |
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