Recent comments in /f/explainlikeimfive
[deleted] t1_j2arytm wrote
Mammoth-Mud-9609 t1_j2aryhw wrote
Reply to eli5 why is the winter solstice not on the same day as when the earth is closest to the sun? by o_pyrite
Solstice relates to the tilt of the Earth not to distance from the Sun, occasionally the distance between the Earth and the Sun is slightly less, but that is like sitting 10 metres away from a burning log fire and moving 1 millimetre closer to the fire.
randomFrenchDeadbeat t1_j2arpms wrote
Reply to ELI5 why do electric vehicles have one big battery that's hard to replace once it's expired, rather than lots of smaller ones that could be swapped out based on need (to trade off range/power/weight)? by ginonofalg
They DO have lots of smaller ones, assembled together with a water based cooling system.
Some chinese only EV cars also have a detachable battery assembly so they can "charge" in 5 minutes (they swap the whole battery assembly for one that is charged).
Digitus___Impudicus t1_j2ar9nn wrote
Reply to ELI5: Why is the recoil of a gun not nearly as bad as getting hit with a bullet while wearing a bullet proof vest if they are both the same force? by Tratakaro
Well, you are missing a couple of things.
#1. The force expended will take the path of least resistance. Which is pushing the bullet out and down the barrel. At which point a portion of the force it released out the end with not resistance.
#2. Concentrated above force is behind a small object. That has little to no resistance and is magnified by all force being directed from behind to push it out of the barrel.
#3. The recoil is only the force that is not expended out of the barrel.
#4. If you plug the barrel, you have violent explosions where the force has no place to release and often kills the person holding the gun because the force is directed equally in all directions.
If you had a firecracker and placed, it on your open palm and lit it. It exploded it would hurt like hell but you might not have massive damage. Lit it and close your hand around with a fist and you are going to loose fingers. The blast from the firecracker dissipates in all directions and you hand only gets a portion of that expelled blast. Close your hand and you hand takes it all. Sort of the same idea.
TRDL: The vast majority of the force produced is concentrated and expelled out of the barrel where there is no resistance. In recoil you are only getting the force that could not be vented out the barrel and in the vest getting hit by the bullet you are getting everything else which is the vast majority of the expended blast translated into kinetic energy.
SparklyMonster t1_j2ar51i wrote
Reply to comment by Azeranth in ELI5: Why is stress from exercising good for our body/heart but stress from anxiety isn't? by ecanem63
Which is the reason excess exercising is also bad for you. Think about sport injuries involving ligaments, stress fractures, even heart attacks. Of course, that's more common for professional athletes who are contract-bound to train many hours every day. But even if you lift weights: the reason training regimens make you cycle through different exercises is to allow some muscles to rest for a couple of days even if you hit the gym everyday.
OushiDezato t1_j2aqxb2 wrote
Also, in medicine it's used to mean "a previous study". If a radiologist needs to see a prior, then they're looking at a previous exam in order to compare it to a current exam.
[deleted] t1_j2aqq1n wrote
PD_31 t1_j2aqllx wrote
Water has a density of 1kg/L. Since soda is mostly water (with stuff dissolved in it) it will have a similar density, thus your 1.5kg for 1.5L. Some of the ingredients will affect that, particularly the carbon dioxide as it escapes from the solution as a gas, but it should still have a density close to 1.
[deleted] t1_j2aqecv wrote
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[deleted] t1_j2apxpc wrote
Sleepinator2000 t1_j2apthj wrote
I'm glad you asked this question, I didn't know there was a rating, and this is super interesting to me. I had no idea that EVs were that much more efficient at converting energy, and had assumed that the benefits were something of a wash if their supporting powergrid was using coal or petroleum to generate the electricity to charge the car.
Doing a little research, it looks like the range of efficiency is 120 MPGe for a Tesla Model 3 (the best), and 68 MPGe for a Ford F-150 Lightning (the worst).
That tells me that the absolute worst electron guzzlers are still better than the absolute best internal combustion vehicles (Hundai Ioniq at 59 MPG for 2022).
Obviously there are additional environmental concerns with the original manufacture of electric vehicles, especially in coal burning countries like China, but if your electric grid is backed up by wind, solar, or hydro, this seems like a cowabunga slam-dunk.
Am I forgetting something, like power lost in transmission through a grid?
ScienceIsSexy420 t1_j2apput wrote
Reply to comment by DjHalk45 in eli5: why does hot coffee erupt when add brown sugar? by DjHalk45
Ahhhhh, I then yes as the top comment mentions what's happening is you're superheating the coffee. In order for water to boil, there needs to be something called a nucleation site, or a place for the water vapor bubbles to form in the liquid. If there are no nucleation sites, a liquid can actually get heated to well over its boiling temperature. Then, when we introduce nucleation sites, the liquid boils RAPIDLY and VIOLENTLY. Surface imperfections act as nucleation sites, but glass and ceramic are both very smooth. In the chemistry lab, when we heat liquids in glass, we add a boiling chip to ensure the can boil properly and doesn't get superheated.
So, short answer, try adding the sugar before you put it in the microwave! Or microwave for less time, you are over heating your water
Mental_Cut8290 t1_j2apovk wrote
Reply to comment by Slime_Giant in ELI5: Why is the recoil of a gun not nearly as bad as getting hit with a bullet while wearing a bullet proof vest if they are both the same force? by Tratakaro
It would be like holding the gun at your chest. Pretty painful.
blipsman t1_j2apj2a wrote
Reply to ELI5: How do loans and credit cards work by idkmybffdee
Lenders get funds from various sources, such as bank deposits and investors. You put money into a savings account and earn 1% while the bank lends that money on mortgages at 5% or credit card lines of credit at 20%. Institutional investors also buy baskets of mortgages, which act like bonds, and that means the banks again have money to issue more mortgages instead of having to wait for those loans to be paid off.
wavform t1_j2ap7tq wrote
Reply to comment by Randomperson1362 in ELI5: Why is it that, at some gas stations, it’s cheaper to pay with cash instead a credit card? by tgjj530
In addition, all these card companies have increased rates dramatically over the last 2 years. This (Cash v. Card pricing) will be the norm soon across most vendors that use cards daily. Most restaurants in my area already do this if they are not corporate backed to absorb those extra fees.
spudmix t1_j2ap5fr wrote
Reply to comment by calbhollo in ELI5: What does Prior mean when used as a noun? by calbhollo
Very welcome!
calbhollo OP t1_j2ap1df wrote
Reply to comment by spudmix in ELI5: What does Prior mean when used as a noun? by calbhollo
Oh yeah I wasn't expecting you to read it, just answering the question of where it came from, don't worry haha. I think I understood most everything, anyways.
mafiaknight t1_j2ap0ry wrote
Reply to ELI5: How do venomous snakes avoid being poisoned by the venom they inject into their prey? Are they somehow immune? by booksandteacv
Poison is ingested. Venom is injected.
Remember: if it bites you and you die, it’s venomous. If it bites you and then dies, you’re poisonous.
Poison only effects creatures that eat it. It has to be digested.
Venom only effects creatures that are injected by it. It isn’t harmful when digested.
Arkalius t1_j2aohtv wrote
Reply to comment by Oilfan94 in ELI5: Why do electric vehicles need a MPG measurement? I by WannaBelTGuy
It doesn't seem like a useful comparison to me to be honest. On an ICE vehicle I can pretty easily use that number to get an idea of how expensive the car is to drive. On an electric only vehicle, that number doesn't really tell me anything useful about the car. Maybe it makes it look more "energy efficient" but that's not the important thing to me. I want to know how much it costs to drive.
spudmix t1_j2aocsu wrote
Reply to comment by calbhollo in ELI5: What does Prior mean when used as a noun? by calbhollo
Thats a massive post and I don't have time to parse it out for you, sorry. If you have specific questions about priors I'm happy to try help.
B-F-A-K t1_j2ao7lv wrote
Reply to eli5 How does measuring area in square miles work? If you have very mountainous terrain, does that increase the area compared to somewhere that is very flat? by bluejeans90210
There's an episode of the "A Problem Squared" Podcast where Matt Parker goes over that topic.
I think it was 008
https://open.spotify.com/episode/7AANYYNV5vAqckjPQeIkK8?si=yooZqI7hRuWrTp_tLQ6Y5g
Short answer: it is the projected area, not the real 3D surface area that is measured.
mjb2012 t1_j2ao3j8 wrote
Reply to comment by ScienceIsSexy420 in ELI5: 1.5 liters of softdrink (coca cola) 1.5 kg as well? by kz21n
For the benefit of the OP, slightly more ELI5: “by definition” here means that the people who invented the kilogram intentionally said that a kilogram is whatever 1 litre of distilled water weighs (or rather, its mass) at sea level. Basically. So yes, the weight of the soda bottle in kg must be pretty close to it’s volume in litres, assuming it’s filled with mostly water and assuming you’re on the surface of the earth.
FizzySpew t1_j2anp1k wrote
Reply to comment by NoSoulsINC in eli5: What cause a pee stream to sometimes split into multiple different streams? by PhonedVenus21345678
For me (a guy) it's usually a pubic hair that got right there. Pulling the hair off brings the two streams into one.
SirDuke6 OP t1_j2ano69 wrote
Reply to comment by ImReverse_Giraffe in ELI5: Why does putting one foot out from under the blankets bring so much relief of heat while laying in bed? by SirDuke6
Life pro tip for free? Thank you!
SparklyMonster t1_j2as0ic wrote
Reply to comment by drunken_assassin in ELI5: Why is it that, at some gas stations, it’s cheaper to pay with cash instead a credit card? by tgjj530
Though I guess there must be some sort of control since the station is depleting its stock of gas, so it's not like they can order more gas and say they didn't sell what they had... (or can it?)
Which is a different case from doctors and dentists who'll only accept cash or charge more for any other form of payment that is not cash (including the ones that don't have fees).