BussyCat
@BussyCat@lemmy.world
- Comment on Cooling stuff does not require any energy! 3 days ago:
If it’s directly touching the walls it will decrease the efficiency of the freezer since initially the rate of resistance to heat transfer could have been represented by L/KA+ 1/hA with L being thickness of the wall of the freezer K being the thermal conductivity of the freezer wall and A being the surface area and h being the convective heat transfer of mostly stagnant air. In that case the effect of conduction through the freezer wall is a worse insulator than the transfer of heat through the air but by touching the item to the freezer wall you are trading that 1/ha for another L/KA with a negligible L so the resistance to heat transfer is also negligible.
That’s a lot of terms but you have experienced this before if you have a pan on the stove and you hold your hand above the pan it will feel significantly less hot then if you place your hand directly on the pan. If you have someone put a fan over the pan so there is a flow of air and then put your hand in the same place it will feel warmer since now you have air movement which increases your h term but it will still be significantly less hot then if you touch the pan.
I still might not be explaining this well but the math for it comes from the resistive model of heat transfer that while it has a lot of reciprocals I still find it to be the easiest to get an intuitive idea of what’s happening
In summary though from everything.
Empty freezer bad because the air inside leaves whenever you open it.
Very full freezer bad because it blocks flow of coolant causing hot spots and cold spots so needs to be kept much colder to make sure the hot spots don’t get too hot which causes more losses
Touching freezer wall bad because accelerates warming
Mostly full freezer good because the items work as a heat sink helping to keep a regulated temperature while allowing proper flow of coolant
- Comment on Cooling stuff does not require any energy! 4 days ago:
Well temperature goes from hot to cold so are you referring to warm food cooling from conduction of touching colder food?
- Comment on Cooling stuff does not require any energy! 5 days ago:
In the off chance this involves the plan to load the fuck out of your freezer since it’s “free” if you overfill the fridge/freezer you are likely to interfere with the flow of cooling air causing cold spots and hot spots to form that will reduce overall efficiency
- Comment on We don't use the word 'fascist' because we wish harm on anybody. We use it because words mean things. 1 week ago:
What do you call people who wear red and black swastikas and say heil Hitler while doing a salute typical of the Nazi party?
- Comment on Has this ever happened to you? 1 week ago:
I’m not saying that is the norm but more so that it may not be just internal misogyny that causes the poster to reach their conclusion
- Comment on This should be true 1 week ago:
First everyone gets back pay, then people need to work a bunch of overtime after the shutdown to make up for work, so will actually cost even more money.
But even if that wasn’t true, employee salaries make up less than 5% of the budget so a 35 day shut down (the previous record) would make up less than half a percent of the budget
- Comment on Has this ever happened to you? 1 week ago:
Like the guy defenitely comes off as a dick but also if you check out conventional social media you will see guys who talk about being expected to pay for not just the girl but also their friend, and you will see girls talk about how if she brings a friend for protection then the guy should pay for the friend too.
So many variables exist that we don’t know but for some people there an expectation that if a girl brings a friend the guy needs to pay for both and I wouldn’t default that to just misogyny
- Comment on Not to get all religiony but why in the old testament God was all fire and brimstone and fatal consequences? But the new testament God is all about forgiveness and such?? 2 weeks ago:
I could be wrong but isn’t Ha-Satan just the title for “the accuser” and not the biblical satan who is the fallen angel
- Comment on New phonetic alphabet just dropped 2 weeks ago:
But it isnt English focused and the reason it sounds militaristic is because the media shows the military use it
Alpha is Greek Bravo is Italian Delta is Greek India is its own country Kilo is Greek Lima is a city in Peru November is Latin Papa is decently multilingual Quebec is an indigenous word that was coined by a Frenchman Sierra is Spanish Tango is Spanish Victor is Latin Zulu is an indigenous tribe
Charlie, Juliet, Mike, Oscar, Romeo are all names that exist in multiple languages
Like it’s easy to think of it as being American since the American military uses it a lot but it was specifically designed to be useful by non English speakers for joint operations
- Comment on This Plastic Mr. Fantastic 2 weeks ago:
Filters and stripping columns. It’s not that hard to do and if you have a clean source of plastics (not mixed with garbage) then it’s basically all just hydrocarbons with a little bit of nitrogen. Carbon + oxygen + hydrogen = CO2 and H2O which while we don’t need more CO2 it’s significantly better then generating that same energy from oil as it is cleaning up our waste vs extracting more from the ground.
Its a lot harder when you do trash incineration as that has a lot more nasty stuff in it but plastics are easy
- Comment on This Plastic Mr. Fantastic 2 weeks ago:
Individuals are essentially useless on a global scale but companies like BP aren’t drilling for oil to accomplish their sinister goal of warming the earth they are producing a product that all of us as individuals are purchasing.
It’s like you are in a dog park that’s covered in dog shit, just because there’s shit everywhere doesn’t mean you shouldn’t clean up after your dog. Telling other people they don’t need to worry about cleaning up their shit because the guy with the dog training school doesn’t clean up any of the shit that those dogs makes you bad.
You cleaning up after your dog isn’t going to clean the whole park but doing nothing until a petition is done that enforces cleaning up your dog isn’t the way. I’m not asking you to spend all day trying to clean the park but you should at least do your best to not make it worse
- Comment on This Plastic Mr. Fantastic 2 weeks ago:
Should just follow japans lead and incinerate the plastic for energy
- Comment on How do I keep a 9 year old from constantly licking erasers and putting them in his mouth 2 weeks ago:
Personally still going to put the blame there on eraser eater, but the whole point of this post was to find something that actually works to curb the behavior
- Comment on How do I keep a 9 year old from constantly licking erasers and putting them in his mouth 2 weeks ago:
It can easily be a chocking hazard, it’s unsanitary, and it can cause the child to be ostracized by peers which can limit their social development.
- Comment on Golden Rule is flawed 3 weeks ago:
You can still punish people without an eye for an eye.
If a person loses control of their car and kills a pedestrian, an eye for an eye would mean the perpetrator would be killed.
A just legal system would put them in jail, make them pay financial restitution, and suspend their license.
Our actual legal system gives them a slap on the wrist and says don’t do that again
- Comment on Shipping costs will no longer exist if teleportation is invented. 3 weeks ago:
Teleportation is a made up technology so the rules around it are made up. But if we set some basic rules for it that are at least somewhat ground in science fiction.
You will probably need a receiving pad for the teleported items to arrive to as the earth is constantly moving through space so you need to anchor the teleporting location, that will probably be expensive
In order to follow the first law of thermodynamics where energy has to be conserved at the minimum the energy required for moving the goods will have to be used by the transporter and probably with some amount of inefficiency so if we say it takes the same amount of energy as it currently cost but with less labor and less warehouses it can easily cost several dollars and would scale based on distance
So you would probably be responsible for paying those energy costs and the teleporter pad costs
- Comment on Due to the bystander effect its highly unlikely any stranger would help you if you got attacked in a public space 3 weeks ago:
It’s not even a theory, it was a hypothesis with some loose evidence and while it likely explains some amount about human behavior it’s not anywhere on par with actual theories even by social science standards
- Comment on if you're a landowner, then you defacto own the people on your land because people are categorically defined as existing in a time & place and you literally own the place so you own their existence 3 weeks ago:
Was there a particular substance that led to this epiphany, and do you have enough to share with the class?
- Comment on If spiderman shoots webs from his wrists would not the tension of shooting and swingiing up a skyscraper pretty much break his wrist? Also why SpiderMAN shouuldn''t it be SpiderTEEN? 4 weeks ago:
I know this is probably googleable but I swear it was like strength of a man sized spider and like could lift a car. Also haven’t seen a spider man movie in a long time so could be wrong
- Comment on If spiderman shoots webs from his wrists would not the tension of shooting and swingiing up a skyscraper pretty much break his wrist? Also why SpiderMAN shouuldn''t it be SpiderTEEN? 4 weeks ago:
Doesn’t he have super human strength which would require superhuman tendons and bones
- Comment on That's an impressive drop. Any ideas why? 5 weeks ago:
11.4% take anti depressants and between 40-65% experience some degree of sexual dysfunction so even using the highest numbers and assuming that the sexual dysfunction completely eliminates interest in sex (it doesn’t) that would only be 7.41%
- Comment on '3d-printing a screw' is a way to describe how AI integration is stupid most of the time 1 month ago:
But would you advocate for trying to integrate 3D printed fasteners into bridge construction?
LLMs do actually have a lot of use, asking it to rephrase an email or report to make it more concise can save a considerable amount of time but trying to get an LLM to perform complex calculations isn’t what it’s made to do and it fails at it.
Also just to be pedantic but do you use 3D printed screws or 3D printed bolts?
- Comment on Inspiring. Innovating. 1 month ago:
Even if you let them fully mature they will eventually breakdown because that’s what trees do and then all that stored carbon will return to the atmosphere. This carbon capture is mostly fruitless as the amount of carbon they store is negligible compared to how much we are adding to the atmosphere but if they are turning it into “rock” which is likely just graphite that would take carbon out of the carbon cycle and actually sequester it. which we desperately need to do to offset the ridiculous amount sequestered carbon we are adding to the atmosphere
- Comment on Japanese Power Plant Turns Saltwater Into Electricity 1 month ago:
It’s a pop science article… they usually don’t cover things like life cycle analysis. It is however a first of its kind plant that makes its net effects less important as it kind of works as a proof of concept. It’s a relatively small scale plant that if it does work, great, lets build more of them; if it doesn’t work, that sucks, can we modify them in any way to make them work.
It is taking two ingredients that usually have to take extra energy to be able to dispose of them and combining them together to make electricity. That is really cool, and there is no reason to be overly negative about it because it might be bad based on info that you don’t have
- Comment on China turns on giant neutrino detector that took a decade to build 1 month ago:
Nuclear reactions do involve neutrinos and antineutrinos but they aren’t super important for fission so I am assuming the decade long detector would be for something else
- Comment on 2hot2handle 1 month ago:
It says in textbooks that in a vacuum water will spontaneously boil so arguing that it’s not spontaneous is wrong.
It happens as pressure decreases but unlike conventional boiling where you can see nucleate boiling it can instead happen all at once without you adding heat to the system
Most importantly he’s trying to argue semantics with a person who is much smarter than him and then ends it with a condescending “simple thermo”.
- Comment on Why don't they have simpler names for brain disorders, where perhaps even the person suffering the disorder might be able to remember the term themself? 1 month ago:
He has dementia which is an easy enough word for most people to be able to say. If you want to know the location of the dementia it’s in the frontotemporal area of the brain. But why that complex word well the front of the brain is called the frontal lobes which is a fairly logical name then the temporal lobe is the part that’s near your temples which is also kind of logical.
Historically medicine has been bad about being less specific with names and instead just naming things after people which while they are easier to say don’t actually describe what’s happening
- Comment on If AI “hallucinates,” doesn’t that make it more human than we admit? 1 month ago:
It’s not a programmed creativity it’s a flaw in an algorithm. If you enter into a calculator 2+2 a 100x you would expect to always get 4 but if every once in a while it gave you 5 you wouldn’t call that creativity… it’s just wrong
- Comment on what are the grievances with the "male loneliness epidemic"? 1 month ago:
I was just as confused when I first heard the terms lol
- Comment on If AI “hallucinates,” doesn’t that make it more human than we admit? 1 month ago:
The “danger” comes from reliance and a misunderstanding of capabilities. It can save time and be very helpful if you use it to make a framework and then you fill in/ modify the pertinent details. If you just ask it to make a PowerPoint presentation for you about the metabolic engineering implications of agrobacterium and try and present without any proofreading you will end up spouting garbage.
So if you use it as a tool and acknowledge its limitations it’s helpful, but it is dangerous to pretend it has some semblance of real intelligence