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If you mix equal parts 20° water and 10° water does it all turn into 15° water? Does it matter if it's Celsius or Fahrenheit?
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Jan 10, 2017 02:57
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It'll be pretty close to 15 degrees celsius. At warmer temperatures the specific heat of water increases, so the 20 degree water will hold slightly more energy per gram, and thus the temperature will end up very slightly above 15 degrees celsius. Also this is assuming your amounts are determined by mass and not volume because I didn't want to do the math for that. Here's a table if you want to crunch out exact numbers: http://www.engineeringtoolbox.com/water-thermal-properties-d_162.html If it's fahrenheit then you've probably got some kind of antifreeze additive in the water and must take that into account in your calculations. Either that or you're sticking ice cubes in a box together and then you need to take into account the environments temperature because the ice cubes will take a lot longer to reach a uniform temperature. For temperatures above freezing though the same idea applies. E: That being said even ignoring the specific heat issue the error is pretty stupidly small and basically no one will care, probably. CrazySalamander fucked around with this message at 03:25 on Jan 10, 2017 |
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Jan 10, 2017 03:23
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Yeah when I said Fahrenheit I just meant like "double the temperAture" so 100° and 50° will be around 75°? Thanks for the explanation though, pretty interesting! I appreciate it
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Jan 10, 2017 03:32
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I need to rent a car in the short term. I was looking at enterprise (close to my house, fits my budget, don't know any other places), but can't figure out: do they charge mileage fees? It'd be all in-state driving, I'd put no more than 500 miles on it in a week and that's a very high estimate.
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Jan 10, 2017 05:42
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GobiasIndustries posted:I need to rent a car in the short term. I was looking at enterprise (close to my house, fits my budget, don't know any other places), but can't figure out: do they charge mileage fees? It'd be all in-state driving, I'd put no more than 500 miles on it in a week and that's a very high estimate. Enterprise will specifically list mileage fees when they're present, try clicking on the total price you see and it should pop up a breakdown of all applicable fees. As long as you're picking it up and returning it in the same state, or same location, they usually don't charge a mileage fee.
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Jan 10, 2017 05:49
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4 RING SHRIMP posted:If you mix equal parts 20° water and 10° water does it all turn into 15° water? Does it matter if it's Celsius or Fahrenheit? I remember wondering about this back in high school, then covering temperature equations in physics class, then using that info to work out that yes, it averages out. I cannot remember any of the maths that explains why, though. My maths is too poor to tell you whether it apples in Fahrenheit as well. It feels like it should though... Hyperlynx fucked around with this message at 06:31 on Jan 10, 2017 |
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Jan 10, 2017 06:28
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4 RING SHRIMP posted:Yeah when I said Fahrenheit I just meant like "double the temperAture" so 100° and 50° will be around 75°? Just be aware that terms like "double the temperature" only have actual physical meaning in relation to absolute zero. The "zero" points of Fahrenheit and Celsius are totally arbitrary; they're just convenient temperatures for us humans measuring things like the weather on Earth. Two degrees F is not "twice as hot" as one degree F in any real sense.
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Jan 10, 2017 06:50
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Hyperlynx posted:I remember wondering about this back in high school, then covering temperature equations in physics class, then using that info to work out that yes, it averages out. I cannot remember any of the maths that explains why, though. For high school physics yes, it'll average out because they're going to ignore the change in specific heat. Otherwise the definition of a joule when describing heating water wouldn't specify 4.184 J as heating 1g water from 0 to 1 degree celsius. The temperature is going to be a function of the total energy in the system. Wikipedia gets lazy about this since it's a small difference, but you can see the water definition here (this is where wikipedia sourced it anyway) http://www.engineeringtoolbox.com/heat-units-d_664.html As far as the doubling in temperature, as Powered Descent notes that is a whole other can of worms. CrazySalamander fucked around with this message at 07:08 on Jan 10, 2017 |
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Jan 10, 2017 07:06
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Convert to kelvin for heat-based calculations, do the math, then re-convert to whatever you want. Compare kelvin temperatures to get the ratio between different temperatures. Heat is a measurement of molecular kinetic energy. Kelvin is an absolute scale for that. Mixing 500K water and 1000K water results in 75K water. Conversion to Celsius and you have 226c water and 726c water gives 476c water. 1c and 1K are the same division of heat, just Celsius is pushed down 273 degrees from kelvin. Fahrenheit divisions are different. PRADA SLUT fucked around with this message at 07:25 on Jan 10, 2017 |
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Jan 10, 2017 07:18
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PRADA SLUT posted:Mixing 500K water and 1000K water results in 75K water. Local nerd discovers one weird trick to cool your house by mixing hot water (Thermodynamicists hate him!)
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Jan 10, 2017 07:55
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Can someone recommend me a good alternative to Microsoft Excel that isn't cloud-based? I really love Excel, but I am no longer in a place where I can use it, thus I'm seeking out free alternatives. Open Office is a loving trainwreck. I'm having problems with certain functions and when I try and resolve them by looking them up online, I'm seeing people as far back as 2009 having the same problems which have yet to be patched out, yet. And Google Docs might be okay, but this computer is kind of a shitheep and doing things online is a chore. I can run applications installed to the computer just fine, but online poo poo (Google Drive, Mapquest, whatever) brings it to a crawl.
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Jan 10, 2017 08:27
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credburn posted:Can someone recommend me a good alternative to Microsoft Excel that isn't cloud-based? I really love Excel, but I am no longer in a place where I can use it, thus I'm seeking out free alternatives. Open Office is a loving trainwreck. I'm having problems with certain functions and when I try and resolve them by looking them up online, I'm seeing people as far back as 2009 having the same problems which have yet to be patched out, yet. And Google Docs might be okay, but this computer is kind of a shitheep and doing things online is a chore. I can run applications installed to the computer just fine, but online poo poo (Google Drive, Mapquest, whatever) brings it to a crawl.
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Jan 10, 2017 08:30
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PRADA SLUT posted:Convert to kelvin for heat-based calculations, do the math, then re-convert to whatever you want. Compare kelvin temperatures to get the ratio between different temperatures. And what's (726 + 226)/2 ? Converting to Kelvin and back does nothing useful there
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Jan 10, 2017 08:31
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Hey, I have a silly Excel question? Maybe? I'm trying to do something that I recall being very simple, but I learned on Excel 2007 and I'm using Excel 2003 now...I suspect this is still available, but it isn't in the same place, and I don't remember what it's called. I've written a script for a kind of play, and I've put it into Column A the names of the characters and in Column B their associated lines. It's written chronologically, but I want someone to be able to, via a drop-down menu at the top of the table select, say, Character A and it will display only lines for Character A. I swear this is simple. Help? EDIT: Neeeeevermind. This is a fancy feature from later Excels. credburn fucked around with this message at 14:35 on Jan 10, 2017 |
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Jan 10, 2017 13:56
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credburn posted:Hey, I have a silly Excel question? Maybe? I'm trying to do something that I recall being very simple, but I learned on Excel 2007 and I'm using Excel 2003 now...I suspect this is still available, but it isn't in the same place, and I don't remember what it's called. Load it into Google Sheets and use Autofilter, for a free solution.
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Jan 10, 2017 14:59
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credburn posted:EDIT: Neeeeevermind. This is a fancy feature from later Excels.  It's been there, in that place, since before Windows 95 came out, give or take.
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Jan 10, 2017 15:11
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Hyperlynx posted:And what's (726 + 226)/2 ? No, but it's useful to convert for every heat calculation and to check for gently caress-ups. If you convert you're not going to get the wrong answer for anything else, like a Carnot cycle. PRADA SLUT fucked around with this message at 15:25 on Jan 10, 2017 |
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Jan 10, 2017 15:21
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credburn posted:Can someone recommend me a good alternative to Microsoft Excel that isn't cloud-based? I really love Excel, but I am no longer in a place where I can use it, thus I'm seeking out free alternatives. Open Office is a loving trainwreck. I'm having problems with certain functions and when I try and resolve them by looking them up online, I'm seeing people as far back as 2009 having the same problems which have yet to be patched out, yet. And Google Docs might be okay, but this computer is kind of a shitheep and doing things online is a chore. I can run applications installed to the computer just fine, but online poo poo (Google Drive, Mapquest, whatever) brings it to a crawl. If you need to use complex functions and rely on them functioning you need to use real Excel. Why can't you just use Excel anymore? Any old copy of Excel from the past 20 years that you had is still going to run fine today.
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Jan 10, 2017 16:00
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PRADA SLUT posted:Convert to kelvin for heat-based calculations, do the math, then re-convert to whatever you want. Compare kelvin temperatures to get the ratio between different temperatures. The specific heat changes with temperature. The specific heat is the amount of energy needed to change the temperature of a substance by 1 degree.  This means that if you can't assume a direct linear correlation between the energy put into the system and the temperature. I will concede that I had it backwards and that the water temp will be slightly less than 15 degrees if you mix 10 and 20 celsius water.
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Jan 10, 2017 17:15
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tuyop posted:I vacuum sealed a loaf of white sourdough bread for mailing and it got all smushed down, is it ruined now or will it just magically pop back up? I know it is too late for you now but don't use a vacuum sealer, instead do a Poor Mans vacuum seal. Put the bread in a freezer ziplock bag. Seal the "zipper" almost shut leaving just a 1/2in or so open. Fill your sink or a bucket, whatever is big enough, with water and submerge the bag in slowly stopping when the water displaces all the air. Stop just short of the "zipper" part of the bag going under and then seal it. The water isn't likely to crush the bread much but it will displace the air easily. You may have to help any air pockets escape when doing it. Fake Edit: To be even more safe you can wrap the bread in plastic wrap before putting it into the bag to add a layer of protection.
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Jan 10, 2017 18:57
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CrazySalamander posted:The specific heat changes with temperature. Oh cool! That's the bit they don't tell you in high school physics.
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Jan 10, 2017 22:08
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GobiasIndustries posted:I need to rent a car in the short term. I was looking at enterprise (close to my house, fits my budget, don't know any other places), but can't figure out: do they charge mileage fees? It'd be all in-state driving, I'd put no more than 500 miles on it in a week and that's a very high estimate. No, but priceline a rental. you can get absurd deals sometimes.
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Jan 11, 2017 01:35
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hooah posted:I've had a really obnoxious dry cough the last few evenings/nights. I've tried Delsym (dextrorphan) and Halls lozenges. So far only the Halls works, but it's obviously not a good idea to suck on one while going to sleep. Anything else I can try to help me get to sleep easier? A very low dose of a narcotic pain reliever is like the best cough remedy out there. Do you know any Canadians or Texan rappers who can mail you the good cough syrup?
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Jan 11, 2017 01:58
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What's the best adhesive for temporarily attaching foam pads to some indoor varnished wood? It's okay to be rough with the pads but not to leave any residue. I'm thinking double-sided tape.
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Jan 11, 2017 03:57
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Jeb! Repetition posted:What's the best adhesive for temporarily attaching foam pads to some indoor varnished wood? It's okay to be rough with the pads but not to leave any residue. I'm thinking double-sided tape. Hot glue. Just put little dots down, it'll come off of everything and hold well. If it stays behind really well, just heat it with a hair dryer and wipe it off.
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Jan 11, 2017 04:27
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Is Youtube Doubler dead? I can't find a trace of it online. There was a Richard Feynman mashup with a DJ that I like to show my students once in a while. (so if you have a non-youtube doubler version of that gem, let me know too!)
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Jan 11, 2017 04:52
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How many nukes would it take to end humanity? What are the differences between old school nukes and today's most powerful nukes? Tell me stuff about nukes.
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Jan 11, 2017 06:17
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Industrial Meat Package posted:How many nukes would it take to end humanity? What are the differences between old school nukes and today's most powerful nukes? Tell me stuff about nukes. AIRPOWER/Cold War Thread: There is a Bear in the Woods Ask the dudes in that thread - I wouldn't recommend trying to read it because it's currently pushing a thousand pages.
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Jan 11, 2017 06:24
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Does anybody know what kind of tree this is? It's dying and I'd like to save it, but I don't even know what to Google!
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Jan 11, 2017 14:55
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After 6 years at our place, my wife and I got our first noise complaint. During a period where we were out of town 2 out of 3 weeks. I think it is just new people who haven't lived in apartments before upset that they can hear our footsteps. So the questions are: what are the best ways to reduce footstep noise for the downstaris neighbors, and how do we protect ourselves if the downstairs neighbors keep complaining about footsteps to our landlord?
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Jan 11, 2017 17:18
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Industrial Meat Package posted:How many nukes would it take to end humanity? What are the differences between old school nukes and today's most powerful nukes? Tell me stuff about nukes. Here are two government documents that pretty much lay it all out -- Biological and Environmental Effects of Nuclear War. Summary-analysis of Hearings, June 22-26, 1959 The Effects of Nuclear War (1979) Check out these sites for a ton of links for further reading: The Nuclear Vault The Bulletin of Atomic Scientists The Atomic Archive ALSOS Digital Library for Nuclear Issues The Nuclear Secrecy blog is also worth checking out. It's got a fun Nuclear Fallout Simulator, too! 
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Jan 11, 2017 17:38
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joepinetree posted:After 6 years at our place, my wife and I got our first noise complaint. During a period where we were out of town 2 out of 3 weeks. I think it is just new people who haven't lived in apartments before upset that they can hear our footsteps. So the questions are: what are the best ways to reduce footstep noise for the downstaris neighbors, and how do we protect ourselves if the downstairs neighbors keep complaining about footsteps to our landlord? Take off your shoes when you enter the apartment, change your walking style so you don't stomp, lose some weight.
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Jan 11, 2017 18:11
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Search didn't seem to work: is there any thread where people would be talking about the MIT Mystery Hunt? Is there a goon team?
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Jan 11, 2017 18:29
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joepinetree posted:After 6 years at our place, my wife and I got our first noise complaint. During a period where we were out of town 2 out of 3 weeks. I think it is just new people who haven't lived in apartments before upset that they can hear our footsteps. So the questions are: what are the best ways to reduce footstep noise for the downstaris neighbors, and how do we protect ourselves if the downstairs neighbors keep complaining about footsteps to our landlord? Carpet/rugs, and proactively talk to your landlord about it. If it is a "never lived in an apartment" issue then it's best to get in front of it and make clear that you aren't going to tiptoe around a place you pay rent to live in.
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Jan 11, 2017 19:16
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Introduce yourself to your downstairs neighbors.
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Jan 11, 2017 20:26
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kedo posted:Introduce yourself to your downstairs neighbors. We're planning on doing that once both of us are back in town, but I don't have high hopes since their first act has been to file a formal complaint.
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Jan 11, 2017 21:38
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I attempted to Google and couldn't find a firm answer... Do the Queen's guards carry guns with live ammo? I've seen many YouTube videos of them pointing assault weapons at people and wondered if they really had the authority to gun rear end in a top hat tourists down.
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Jan 11, 2017 22:29
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Liar posted:I attempted to Google and couldn't find a firm answer... Do the Queen's guards carry guns with live ammo? I've seen many YouTube videos of them pointing assault weapons at people and wondered if they really had the authority to gun rear end in a top hat tourists down. The guards with guns do have live ammo. They're legit soldiers and everything, and if you really did try to storm the gates or something they will shoot if neccesary.
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Jan 11, 2017 22:49
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Liar posted:I attempted to Google and couldn't find a firm answer... Do the Queen's guards carry guns with live ammo? I've seen many YouTube videos of them pointing assault weapons at people and wondered if they really had the authority to gun rear end in a top hat tourists down. Their rifles aren't loaded unless there's a reason for heightened security, but they always carry live ammo on them.
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Jan 12, 2017 02:00
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Polio Vax Scene posted:Take off your shoes when you enter the apartment, change your walking style so you don't stomp, lose some weight.
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Jan 12, 2017 05:34
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