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[2018-1-19. : 6:23 am] Freakling -- NudeRaiderNudeRaider shouted: Suicidal Insanity that's fine, but I don't see any of the imperial units I required. Think of writing an exam. Just citing the general formula doesn't cut it. jjf28 what do you mean "probably"? Haven't you had these kinds of exercises in school? Is there really no other way than to convert everything twice? What's a BTU? In continental Europe we stopped using those outdated systems altogether: Problem solved! But units are easy to deal with, no matter the system used: Just multiply (and add up) all the numbers, then multiply the unit symbols, making simplifications wherever a shorter unit in the system you are working with exists. If the number you arrive at is too big or too small, scale some of the basic units up or down with the appropriate conversion factor, or just convert everything to the most common/basic representation and use scientific (power of 10) notation (which feels lika a bit of weird and random thing to do still in a metric system that is mostly not based on power of 10 scaling, but again: not my problem  ).[2018-1-19. : 6:22 am]  Corbo -- Also we can just keep asking many more questions than the ones already asked and still have no way to solve this. And variables required might even change depending on the application of the excercise. I am pretty sure at some point we would just be asking what is the spin of the quantum particles in the water's atoms lmao[2018-1-19. : 6:18 am] Corbo -- I assumed no other variables than the ones in Q = mcdT since I am pretty sure that suffices Nude's needs. IRL I would not even dare attempt calculate this without any more information and I would definitely not attempt to do it in imperial units lmao[2018-1-19. : 6:17 am] Freakling -- But even if you start out with a gallon of liquid water at room temperature and standard pressure: Is the heating done isobar or isovolumic (or something else)? The latter would at least make heat expansion and evaporation irrelevant, but would be hard to achieve with an liquid phase material…[2018-1-19. : 6:15 am] Corbo -- we used to consider lots of retarded things like heat escaping through the ground, on windows, sun shining, sun radiation absorbed by shades... etc...[2018-1-19. : 6:14 am] Corbo -- I remember my thermodynamics classes now, the one excercise I remember the most is one that they wanted use to calculate how much energy was inside a house system, we had to consider whatever we thought plausible. The house was in a countryland so I just added like "ocassional cows entering the house" as a heat source and drew in a cow inside the house system and fucking aced that test. Teacher actually gave me +1 point because he found it hilarious lmao[2018-1-19. : 6:10 am] Corbo -- mass pounds get rekt by the ones in BTU and °F in the BTU part gets rekt by dT F[2018-1-19. : 6:09 am] Corbo -- I assume you want the unit breakdown, its like this Q = pounds.BTU/(pound/°F).(°Ft-°Fs)[2018-1-19. : 6:04 am] Freakling -- Suicidal InsanitySuicidal Insanity shouted: Ya, maybe its in a high vacuum and it will boil off by itself In that case 20°C is way above the boiling (or actually sublimation!) point and the "vacuum" would be water vapour, a gallon of which would of course have a very low specific heat capacity, compared to liquid water![2018-1-19. : 6:01 am]  O)FaRTy1billion[MM] -- I'd never heard of it until I took chemistry a couple years go and they asked and I was like "Calories?" based on our food labels have kCals instead of kj[2018-1-19. : 6:01 am] O)FaRTy1billion[MM] -- NudeRaiderNudeRaider shouted: Suicidal Insanity that's fine, but I don't see any of the imperial units I required. Think of writing an exam. Just citing the general formula doesn't cut it. jjf28 what do you mean "probably"? Haven't you had these kinds of exercises in school? Is there really no other way than to convert everything twice? What's a BTU? BTU is imperial for heat or something, idk[2018-1-19. : 5:49 am] Corbo -- Does the room have windows for heat to scape to? Are there any other heat sources that would affect the system? What about the observer's (if any) body temp. That definitely would affect the system by introducing heat[2018-1-19. : 5:41 am]  NudeRaider -- so, I hope that covers most of the questions. Are there any takers for an actual answer?[2018-1-19. : 5:41 am] NudeRaider -- Mini Moose 2707Mini Moose 2707 shouted: Question didn't even specify the altitude of the water, or what planet the water is even on, smh For anything that isn't specified you may assume conditions to your liking. I'm really only interested in the formula and units. For missing but necessary constants you can use reasonable approximations of the likely value. I really don't want to overcomplicate things, but if you insist, you can. I will probably still be able to use your answer.[2018-1-19. : 5:38 am] NudeRaider -- FreaklingFreakling shouted: The influence of pressure though is of course what might finally make this an interesting problem after all ;P tbh this isn't supposed to be an "interesting" problem. It's supposed to be a simple middle school physics question.[2018-1-19. : 5:34 am] NudeRaider -- FreaklingFreakling shouted: NudeRaider The interesting question here is: Does it have to be a perfect gallon at both room temperature and boiling point? Because then thermal expansion becomes a real problem. it's a gallon at room temp. Obviously volume increases as you heat it up.[2018-1-19. : 5:29 am] NudeRaider -- NudeRaiderNudeRaider shouted: Vrael yes. Imperial, so 68 F However you'd still receive full points if you assumed another reasonable value like 70 F.[2018-1-19. : 5:28 am] NudeRaider -- VraelVrael shouted: Corbo about 20 degrees C or 68 F yes. Imperial, so 68 F[2018-1-19. : 5:27 am] NudeRaider -- Suicidal InsanitySuicidal Insanity shouted: NudeRaider Volume * specific heat capacity * dT that's fine, but I don't see any of the imperial units I required. Think of writing an exam. Just citing the general formula doesn't cut it. jjf28jjf28 shouted: probably calculate the energy in metric then convert it to BTUs tbh what do you mean "probably"? Haven't you had these kinds of exercises in school? Is there really no other way than to convert everything twice? What's a BTU?[2018-1-19. : 4:27 am] O)FaRTy1billion[MM] -- I saw a thing that was like a system to use 1 password that is unique for every site, but I'm too lazy to do shit like that so they're all just random xD[2018-1-19. : 1:51 am] O)FaRTy1billion[MM] -- What's my discord password? I keep forgetting to enter it on my phone when I'm at home[2018-1-19. : 1:18 am] jjf28 -- I suppose the correct answer would be a formula with all the undefined variables[2018-1-19. : 1:10 am] Moose -- Question didn't even specify the altitude of the water, or what planet the water is even on, smh[2018-1-19. : 12:42 am] Suicidal Insanity -- Ya, maybe its in a high vacuum and it will boil off by itself [2018-1-19. : 12:08 am] Freakling -- The influence of pressure though is of course what might finally make this an interesting problem after all ;P[2018-1-19. : 12:07 am] Freakling -- Room temperature in science denotes 20°C, though: https://en.wikipedia.org/wiki/ISO_1[2018-1-18. : 11:58 pm] Vrael -- CorboCorbo shouted: ahh, could it by any chance be reference temperature and not room? yeah that's 0 deg C or 273 Kelvin[2018-1-18. : 11:46 pm] Freakling -- NudeRaiderNudeRaider shouted: in imperial measurement, how much energy does it take to heat up 1 gallon of water from room temp to just below boiling point? The interesting question here is: Does it have to be a perfect gallon at both room temperature and boiling point? Because then thermal expansion becomes a real problem.[2018-1-18. : 11:45 pm] Freakling -- jjf28jjf28 shouted: though BTU doesn't really do a volume of liquid, it's defined against a pound of water So what? mass = density * volume…[2018-1-18. : 10:11 pm] Vrael -- well in colloquial conversation it does mean a range of temperature but if you were working a science problem the usual convention would be 20 C[2018-1-18. : 10:09 pm] Corbo -- is it really? I mean I always thought it was a range of temperatures rather than an stablished temperature which is why I asked my very polite question.[2018-1-18. : 9:56 pm] Vrael -- CorboCorbo shouted: NudeRaider the fuck is room temperature? about 20 degrees C or 68 F[2018-1-18. : 6:55 pm] Corbo -- NudeRaiderNudeRaider shouted: in imperial measurement, how much energy does it take to heat up 1 gallon of water from room temp to just below boiling point? the fuck is room temperature?[2018-1-18. : 6:33 pm] Suicidal Insanity -- Ya but in first order approximation water isn't compressible[2018-1-18. : 6:19 pm] jjf28 -- though BTU doesn't really do a volume of liquid, it's defined against a pound of water[2018-1-18. : 6:04 pm] Suicidal Insanity -- NudeRaiderNudeRaider shouted: I'm not interested in the answer, but rather in how you'd calculate it. Volume * specific heat capacity * dT [2018-1-18. : 5:41 pm] NudeRaider -- I'm not interested in the answer, but rather in how you'd calculate it.[2018-1-18. : 5:40 pm] NudeRaider -- in imperial measurement, how much energy does it take to heat up 1 gallon of water from room temp to just below boiling point?[2018-1-18. : 4:22 pm] Dem0n -- https://imgur.com/gallery/pnDuKXG Are any of you Revo-Maxx-Aiur? lmao |