Recent comments in /f/explainlikeimfive

SparklyMonster t1_j2as0ic wrote

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).

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randomFrenchDeadbeat t1_j2arpms wrote

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).

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Digitus___Impudicus t1_j2ar9nn wrote

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.

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SparklyMonster t1_j2ar51i wrote

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.

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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.

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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?

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ScienceIsSexy420 t1_j2apput wrote

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

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blipsman t1_j2apj2a wrote

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.

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wavform t1_j2ap7tq wrote

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.

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mafiaknight t1_j2ap0ry wrote

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.

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Arkalius t1_j2aohtv wrote

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.

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B-F-A-K t1_j2ao7lv wrote

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.

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mjb2012 t1_j2ao3j8 wrote

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.

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