When the heart beats faster, the contractions are closer together in time. But is each contraction itself also faster? |
- When the heart beats faster, the contractions are closer together in time. But is each contraction itself also faster?
- Why does the immune system specifically attack the joints in rheumatoid arthritis?
- Why are UHF TV antennas (almost) always loop antennas, vs. VHF antennas which are usually whip antennas?
- How does velocity through space affect perception of time?
- Could the rabies virus infect insects?
- How do we know photons have no mass vs simply being so small we have no current way of detecting their mass?
- How do gyroscopes work?
- Can you break down exactly what happens during serotonin syndrome?
- Why does water have the highest density at 4 °C?
- What are the direct causes of inflation? Why does inflation happen so quickly?
- Does snow evaporate without melting?
- If I had a lightbulb in a sealed box and turned it on would the light stay in the box?
- Where is the consciousness located?
| Posted: 15 Feb 2022 02:04 AM PST One of my students asked this the other week, and it triggered an intense debate in the classroom. Either answer feels fairly credible! I promised I'd try to look it up, but Google hasn't been very helpful, and a family member who's a medical doctor also wasn't completely sure. It seems to me that since each contraction is coordinated by an impulse traveling down the heart from the SA node, those impulses would need to travel at variable speeds through the cardiac tissue if the contractions were to vary in speed, which feels unlikely? [link] [comments] |
| Why does the immune system specifically attack the joints in rheumatoid arthritis? Posted: 15 Feb 2022 07:42 AM PST Why doesn't it attack (for example) the stomach or the thigh? Edit: thanks for your answers! [link] [comments] |
| Posted: 15 Feb 2022 09:38 AM PST |
| How does velocity through space affect perception of time? Posted: 15 Feb 2022 12:38 PM PST Hello, me and a friend were just watching some vids about time dilation and me and my buddy are trying to figure out where our logic is wrong here, so it would be great to see what we are missing. Understandings: When moving at the speed of light away from a clock, the clock would be perceived as 'frozen' to the travelling person's eyes. What I don't understand about this is that, from what I know the way the eye works is that light must hit the retina for my brain to perceive an image. But surely if I'm moving away at the same speed the light is (both constant speeds), then the first bit of light might hit my eye, but after that there is no distance being made between the light and my eye since both are the same constant speed (for example 2 cars travelling in front of each other in the same direction at the same speed would never actually hit). Surely nothing would be hitting my eye anymore. What am I missing here? I have heard a lot that time dilation is just perspective, just like when I mentioned above, time seemed to be frozen due to moving away from the clock at the speed of light. What I also don't get about this is that, time 'seems' to be frozen, however this is just because the light is not given the chance to hit my retina, surely that's just a visual effect. I have heard that time dilation could theoretically affect how you would age compared to another perspective, but I just don't see how that is the case since everything is to do with 'perspective'. Surely travelling away from that clock at the speed of light doesn't actually stop time for me as an observer, it just stops me seeing the light coming off of it which tells me the clock is ticking. When I return back to earth, everything would have aged the same amount as me? Any comments or clarifications would be awesome! Neither of us study or work in scientific fields so I'm not sure if there is a relatively simple way of explaining this, but again any help would be really appreciated :) [link] [comments] |
| Could the rabies virus infect insects? Posted: 15 Feb 2022 02:03 AM PST If no, why? If yes, why isn't it that the virus spreads rapidly to all animals? [link] [comments] |
| Posted: 14 Feb 2022 10:12 PM PST So I don't know a whole lot about partical physics, I only took a basic physics class at a community college so a simplified explanation would be best but: How do we know that photons don't have a mass? Could it simply be that they have a very small mass we simply haven't detected yet with current technology? And how do we know? [link] [comments] |
| Posted: 15 Feb 2022 06:19 AM PST What is it about rotating mass that creates stability? Also if speed depends on your frame of reference, do gyroscopes have a "universal" frame of reference in space? (I'm probably misunderstanding part of how that works) [link] [comments] |
| Can you break down exactly what happens during serotonin syndrome? Posted: 14 Feb 2022 09:47 PM PST I'm having difficulties finding out exactly what happens in the brain during the whole process of serotonin syndrome so I'm wondering what exactly happened how does the poisoning happen just like the fine details of it [link] [comments] |
| Why does water have the highest density at 4 °C? Posted: 14 Feb 2022 01:05 PM PST |
| What are the direct causes of inflation? Why does inflation happen so quickly? Posted: 14 Feb 2022 12:10 PM PST I've been trying to understand inflation for a while, but I can't wrap my head around what exactly makes it happen. If a material becomes more scarce/abundant, it makes sense for its price to change. Would it not take time for that price change to reach the end products though? If we look at gas prices for example, why would they change every hour? [link] [comments] |
| Does snow evaporate without melting? Posted: 14 Feb 2022 01:26 PM PST I live in a high desert with very low humidity (15%). About 50 cm of snow fell at the end of December. No new snow has fallen for 6 weeks and the temperature has never been above 0 C, yet the depth of snow has decreased to about 25 cm. What causes the depth of snow to decrease when it doesn't melt? [link] [comments] |
| If I had a lightbulb in a sealed box and turned it on would the light stay in the box? Posted: 14 Feb 2022 10:49 PM PST |
| Where is the consciousness located? Posted: 14 Feb 2022 10:53 AM PST I watched a documentary on the topic then wanting to get more sources on the topic. Itwas harder then i thought and still have a hard time understanding what the scientific concensus is if there is any. https://youtu.be/CmuYrnOVmfk The doc I watched talked about the brain stem area. [link] [comments] |
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