If the near centre of a record rotates in 1 second (1cm/second) what would happen if the record was 1000's of metres wide? |
- If the near centre of a record rotates in 1 second (1cm/second) what would happen if the record was 1000's of metres wide?
- Will you still feel hungry when nutrients are artificially sent through your bloodstream?
- How does any photon reach exactly the energy needed to excite a particular atom?
- Why do flames flicker at a relatively consistent rate?
- Are the two doses of COVID vaccine exactly the same?
- Two gorillas were just diagnosed with Covid in CA. What does Covid look like in animals and can a disease, like covid, pose a significant risk to a specieces if there is rapid transmission?
- Is there a scientific/mathematical name for the gradient at which a substance such as sand will begin to fall down if collected into a pile?
- Would an astronaut in a spaceship in geostationary orbit, feel their own weight and be able to stand on the "floor" of the spaceship?
- What's the role of washing soda in making of glass?
- What makes a pathogen highly infectious?
- What happened to caterpillar's DNA after it methamorposes into butterfly?
- Why do rockets and other space probes spin/roll?
- Where do we get stomach flu viruses from?
- How are the Black Sea and Caspian Sea not considered lakes in this day and age?
- Theoretically, is it possible for an mNRA vaccine to contain more than one genetic code?
- Has there been an increase in heart attacks and strokes this year due to COVID?
- What is the equation for elastic potential energy of a rubber ball?
- when could a teen get a covid-19 vaccine?
- where are the stars in the constellation of aries?
| Posted: 12 Jan 2021 12:09 AM PST If the record had a big enough diameter, and it was possible to actually turn it, why wouldn't it be going faster than light? [link] [comments]  |
| Will you still feel hungry when nutrients are artificially sent through your bloodstream? Posted: 11 Jan 2021 04:19 PM PST How is hunger replenished? Does the lack of nutrients of your cells send signals to the brain to tell that your hungry or does it have to do with the stomach, etc.? [link] [comments]  |
| How does any photon reach exactly the energy needed to excite a particular atom? Posted: 11 Jan 2021 08:45 AM PST I know that quantum mechanics states that some things, like bumping an electron to a higher energy level, requires something like a photon to have juuuuust the right energy for the electron to 'accept' that photon and then rise to the higher energy level. But it is always explained that it has to be exact. Like, EXACT exact. It must be, let's say, 10,854.7952 electron volts, which corresponds to a frequency of 12.795832 GHz (ignore the actual values, I just pulled some numbers out of my head). It is always explained that if it were even slightly higher or lower than that amount of energy, the electron wouldn't be excited by it. Well, what are the odds that a photon with that very very VERY exact energy level would come passing by in any reasonable amount of time? I know photons are a tiny amount of energy and there are a huge number of them all the time, but still, it seems like such a precise requirement would be very restrictive, and would result in almost no interactions between particles and the EM force. It seems like all my assumptions can't be right here. What am I missing? [link] [comments]  |
| Why do flames flicker at a relatively consistent rate? Posted: 12 Jan 2021 04:39 AM PST In the following paper, one can see that different flames flicker at 10-12Hz. However, I cannot understand the paper itself. Could anyone simplify why it's the case that seemingly unrelated types of flames flicker at a really specific frequency? Chen, T., Guo, X., Jia, J. et al. Frequency and Phase Characteristics of Candle Flame Oscillation. Sci Rep 9, 342 (2019). https://doi.org/10.1038/s41598-018-36754-w [link] [comments]  |
| Are the two doses of COVID vaccine exactly the same? Posted: 11 Jan 2021 02:40 PM PST |
| Posted: 11 Jan 2021 02:03 PM PST |
| Posted: 12 Jan 2021 06:34 AM PST |
| Posted: 11 Jan 2021 05:14 PM PST Follow my line of thought here, and let me know where my understanding breaks down please. As I understand it, astronauts feel weightless in orbit because they are in a free-fall around the Earth, not because there is no gravity. Earth's gravity is still acting upon the astronaut, but to a lesser degree than if the astronaut was on the ground. If someone built a tower from the ground to, say, where the ISS orbits, wouldn't someone be able to stand on the tower and feel their weight because they are not in a free-fall? Less weight than they would feel on the ground, but some weight. If that is true, let's say someone built a tower up to where geostationary orbit is. Someone should still be able to stand on the tower and feel some weight, right? From that observers perspective, being in a spaceship in geostationary orbit and on a tower at the same height should feel the same correct? Neither are moving with respect to the ground, and they are the same distance from Earth so the effect of gravity is the same. [link] [comments]  |
| What's the role of washing soda in making of glass? Posted: 12 Jan 2021 04:14 AM PST |
| What makes a pathogen highly infectious? Posted: 11 Jan 2021 04:25 PM PST Does the pathogen replicate like crazy basically oozing out of the body? Is it from the symptoms they cause that they take advantage of? Is it from the amount of viruses or bacteria it takes to infect you? [link] [comments]  |
| What happened to caterpillar's DNA after it methamorposes into butterfly? Posted: 11 Jan 2021 11:34 PM PST |
| Why do rockets and other space probes spin/roll? Posted: 11 Jan 2021 07:30 PM PST Like for example take the Perseverance rover. In the animation that NASA uses, it shows the entry capsule to be spinning through space, and once they hit the Martian atmosphere, reverse thrusters stabilize it. Is spinning your way through space somehow important or beneficial? PS. First time posting anything on Reddit, please forgive and tell me if I did something wrong XD [link] [comments]  |
| Where do we get stomach flu viruses from? Posted: 11 Jan 2021 01:12 PM PST We've been in this pandemic for quite some time now. Me and my family have been very precautious by respecting all the measures that were suggested to avoid catching the virus. However, a couple of months ago I caught a bad stomach flu. I had a fever (38.5/39 °C at its peak) and a very violent diarrhea. I got tested for covid through swab test since my doctor said that those can be symptoms for that, but results came back as negative. Also other members of my family got tested a couple of weeks after as a precaution and those also came back as negative. I didn't have any other symptoms other than those and feeling very weak because of all the fluids I lost and poor sleep. My doctor said that it must've been a stomach flu, like I've caught in the past occasionally. A couple of weeks ago the same exact thing happens to my sister's boyfriend. Again, his test's negative, same symptoms, no contact in recent times with other people, everyone else tests negative for covid, etc. Possibly another stomach flu case. That got me thinking: with no contact outside of my few household members (and they're doing the same, being very careful) and everyone in my neighborhood (thankfully!) wearing masks while buying grocheries, social distancing, washing hands carefully, etc. where the heck do we get viruses from? Specifically, stomach flus in this case? [link] [comments]  |
| How are the Black Sea and Caspian Sea not considered lakes in this day and age? Posted: 11 Jan 2021 08:31 AM PST I'm not sure if this belongs here or not, but this has just been bugging the crap out of me for awhile now. To my knowledge any inland body of water that is not directly connected to an ocean is considered a lake, yet the Black Sea and Caspian Sea are still called seas even though they are completely surrounded by land. Is there a logical explanation to explain this or is it literally as simple as a "can't be bothered" thing to do? [link] [comments]  |
| Theoretically, is it possible for an mNRA vaccine to contain more than one genetic code? Posted: 11 Jan 2021 03:27 PM PST |
| Has there been an increase in heart attacks and strokes this year due to COVID? Posted: 11 Jan 2021 06:39 PM PST I've seen multiple studies that point to strokes and heart attacks maybe about a month later after a person being diagnosed with COVID. Is this something that has been common with COVID, and has there been a spike in heart attacks and strokes due to COVID? [link] [comments]  |
| What is the equation for elastic potential energy of a rubber ball? Posted: 11 Jan 2021 06:11 PM PST In physics class, they always talk about the elastic potential energy objects that stretch in one dimension, like springs. In those cases, the elastic potential energy is given by E = 1/2 k x2 And then the force is the derivative F = - k x But if you compress a ball (like if you hold a ball on its sides and push the bottom on the floor), not all parts of the ball are displaced the same amount from their starting point. So is x is that case the greatest displacement? The average displacement? The average displacement weighted by displacement squared? Something else? [link] [comments]  |
| when could a teen get a covid-19 vaccine? Posted: 11 Jan 2021 05:21 PM PST I've heard from many people that teens will not be able to get a covid-19 vaccine even after it is available to the public. I've heard the vaccines like moderna and Pfizer are only available for use for 18 and up, But I've also heard Johnson & Johnson are studying it? I would be very upset if I'm not able to get it because I wont feel safe going to school [link] [comments]  |
| where are the stars in the constellation of aries? Posted: 11 Jan 2021 02:50 PM PST so for a project of mine i was curious: where exactly are the stars in aries if you where to look topdown on our galaxy? would they be towards the rim or the center? im kinda banking on the rim here for my idea to work. [link] [comments]  |
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