Cool Definition and 285 Threads

y = 2.5*(fresnelC(t*2) - arcsinh(t/2)) x = 2.5*(fresnelS(t) + arcsinh(t/2)) In case you don't have anything that can graph this, this is what it looks like from t = -2*pi to 2*pi, from y = -7 to 7, and from x= -7 to 7: There are a lot of interesting ones that can be made with the fresnel...

So, Liquid Nitrogen or Liquid Helium to cool Type I(Lead/Aluminum) superconductor? I know its best to use Liquid Helium, but can I use Liquid Nitrogen and go below the BC of those materials?

Hi, could anyone tell me please, what would be the best colour to paint a boat to keep the cabin cool in a tropical climate? I think the answer probably is white because it will absorb less radiation, but I'm not sure because of course it will also emit radiation better as well. Any...

While reading up the recent hoopla about DWave's new "Quantum Computer" I came across a practical question about cryogenics: How long could you keep a 10 kg mass at below 80mK without any external cooling if you could design the best practical insulation system? DWave claims it is "several...

So I made a program that, so far, converts a password to a string of the binary representation of its successive ASII characters. Here's some output for an example: "gs0dpsrln2" --------> 01100111011100110011000001100100011100000111001101110010011011000110111000110010 "8zoxdsjt9y" -------->...

I've just learned to solve this problem and had such a good time! This is the very well-problem that says that if you want to hire the best secretary for a job you should take a sample of about n/e secreatries and them choose the best that appears to you starting from your sample...

Hello everyone. New guy, first post. I typically frequent gasoline engine performance forums, but my inquisitive nature has led me beyond the scope of general knowledge available within that format. I appreciate any help in figuring out the following. Thank you in advance! If 100 cubic feet...

So, I know that C-14 dating is being used now to solve crimes/identify bodies. Any other examples of it being used for things besides dating really old rocks/fossils? I'm teaching an Earth Science class and I want to show them a few cool articles.

Homework Statement Your 200-g cup of tea is boiling-hot. About how much ice should your add to bring it down to a comfortable sipping temperature of65°C . Assume that the ice is initially at−15°C . The specific heat capacity of ice is 0.5cal g⋅°C , for water is 1 cal g⋅°C. The latent...

If you have a push out window the whole area is open but much of the wind is blocked depending on the angle. With a slide window you often have half the open area but you can get direct wind over 180 degree angle. Which one will cool the room down faster under which circumstance? If there is...

I tried to post this in the education section, however was notified I do not have access to do so? My apologies for any inconvenience. Anyways, my sister who is a 7th and 8th grade mathematics teacher wanted me to come in and teach a lesson (I suppose because she's bored and I'm a...

I'm going to display my rock and mineral collection in glass door cabinets in the living room. I've found some LED under-the-counter lights, 21 small LED lights per 2-ft string. I plan to use one of the strings for each shelf. They come in two "colors", warm and cool. Sorry, they don't...

A little while ago I asked: why does wind feel cold. The molecules are moving faster so it should feel hot. The answer I got was that it increases the evaporation rate of water from your skin. Less water makes you feel cool, I think. Maybe there were some other reasons which I've forgotten...

Hi! I am trying to design a water cooling system that could cool down my computer from 100C to about 40C, with 600W of energy being provided by the components. Could a system that moves 0.2l of water at 0.1kg/s from a water tank to the computer components to a radiator and from there back to...

(that's Fahrenheit of course) For that matter...0 degree F aluminum cubes doesn't cool a room temp liquid as much. frozen H2O cools liquid off much much much much faster and more (in total temp drop terms) than equal surface area "cubes" of aluminum, cooled to -20C. (I've done the...

http://www.cracked.com/blog/7-ridiculous-things-people-believe-about-god-particle/ I found this accurate and amusing.

While trying to deduce the answer to a physics-related (and safety-related) question, I ran across an apparent paradox. I am trying to figure out how quickly the hot gases rising off of a fire cool down. From what I had heard from atmospheric science: 1. Air is a lousy conductor of heat. 2...

http://www.bbc.co.uk/news/technology-18773690 So apparently Samsung hasn't violated Apple's iPad patents. I beg to differ with the judge's ruling however in that the Samsung is much better value (cooler) than the iPad...as with all Apple products IIRC. If, however, "coolness" is often...

Hello all :) I'm look for some cool things to look at or buy, I'm after mainly desk accessories such as swinging pendulums or something magnetic. I have seen some videos a while ago about a kind of magnet gadget which you could place a copper penny inside and it will just float in between the...

Dear Members, I am trying to calculate how quickly hot air cools in a stainless steel pipe. The details are as follows: • a stainless steel pipe conducts hot air with temperature at the top end of the pipe of 85oC (185F). • the pipe is 10m long and passes through 5m of ambient air with...

My question refers to the cooling of water in a well-insulated , cylindrical cup that is opened at the top. 0.336Kg of water at 84degCel is poured into the cup which is left to stand on a table at an ambient temperature of 25degCel. The specific heat capacity of water is 4150 J Kg^-1 K^-1 and...

I confess, I stole this from garrett's twitter page, enjoy... Quoting the pilot's caption at the end: "and suddenly you are free, a really intense feeling of freedom. The true feeling of flying, a magical moment. The best feeling I have ever felt in my life" Rhody... :biggrin: :devil:

Curious about something very very cool! What is the difference between orbital velocity and angular velocity ?? because they both have different formulas but sometimes i had to rely on angular velocity to find the velocity found in v^@/r=GMm/r^2. But, does it really matter how do i find my...

Guess who is becoming a daddy marlon

Check out this pdf on this website. No signing up or anything, It took me the better half of today to do this. Anyways, this might be well known for people above my basic physics knowledge, but I came up with this all by myself knowing a few simple equations...

I need to do a 2D center of mass project for my calculus class. I'm not looking for anyone to do my project but my professor this semester is a REAL bastard. Class average on the first exam was 47%, and we can get up to 12 extra EXAM test points. So I need a really good idea for this project...

I have around 7 gallons of water in a vessel with dimensions 0.3m by 0.3 m by 0.4m. Which of the following should be the fastest way to cool the water from around 100 degrees Celsius to room temperature? 1. Using cooling fans mounted on the top. 2. Using Coolworks Microchiller (not really sure...

basically. for computers you could make it so it has room for 2 boards one board that's as big as the mother board or half its size that is completely dedicated to processing and graphics or just processing. its kinda like having 2 mother boards side by side. but one mother board is dedicated...

I very recently discovered wingsuit jumping. If you don't know what it is, have a look at: , http://www.youtube.com/watch?v=oaMTSOI1Zk4&feature=related and why not . Do you find that as breathtaking as I do?! That looks awesome!

Here 'tis: Enjoy! :wink:

As you took math classes what were some of the interesting topics that you came across that you thought were interesting? I thought transfinite numbers and infinite series were interesting. What did you guys think was interesting, it doesn't matter what level.

As space expands objects dilute out and cool, which includes photons; however photons do not slow down like particles of matter instead, when they cool their vibrational frequencies decrease. This means that they change color, they go from violet to blue then to green, yellow, and red. Then they...

Does oily soup cool faster or slower? Why?

i did a search in the forum and no posts on this.. question- will drinking hot tea cool you down?? ...it does have caffeine..if i remember correctly, caffeine opens your arteries ...it is a diuretic... is there any emperical data or does anyone have any knowledge of lab experiments?

Hello, Quick question: Let's say you have a large open oceanic area with no wind... The sun's radiation hits the water, and heats it, causing some to evaporate. The evaporation creates water vapor. Water mist/vapor, and the ocean itself, heat up the local air and cause an updraft. The vapor...

find a 4-digit phone number, given that it is a square. If we add 1 unit to each digit of the phone number, the new number we obtained is also a square.

While reading the news today, I stumbled on http://www.businessinsider.com/insanely-creative-resumes-2011-6#joe-kelso-says-his-resume-never-failed-1". After a quick look, I was left wondering, would YOU use any of these forms of resumes in hopes of landing you your next job ? Seriously...

Summer has started and I know a lot of college students have already made their schedule for fall. Post them here! I'll start... Engineering Mechanics Thermal Science Nuclear System Dynamics/Control Numerical Methods and Fortran Nuclear Engineering Lab I'm also considering adding...

Cool things or visualiztion i can do on Matlab about linear algebra? such as some 3D matrix visualization or eigenvalue/singular value things/jordan form? Thanks very much for any suggestions.

Mosaic in Lod Israel - way cool ! This mosaic from antiquity recently caught my attention. At first they found the tail of a tiger and eventually found a near complete mosaic floor depicting birds, fish, animals, plants and Roman-era ships. It is about 1700 yrs old. (made in 3rd century)...

do you know that, if someone is born on Jan 23 1967 , next year they will be 45 now, if you put down month, day, age and year, you get 01234567. work also if you were born on Jan 23 1945, at this point you will be 67. this is the only time, in our calendar this will ever happen.

I am a college sophomore getting a degree in physics. I just got an HP touchsmart tablet PC. How do the programs like MATLAB respond to the tablet input features (math input panel). Is there a special version that let's me do cool things such as straightening my lines and drawing perfect...

I was asked to determine how much Air is needed to cool a copper tube. The air will be blowing on the outside surface of the tube as there will be water running through the tube. The starting temperature of the water will be 70°C and the goal end temperature is 35°C...all done in less than 2...

I am thinking why not use mobile cranes to slowly prepare to remove fuel rods (vision from UAV or distant helicopters or balloons) (cutting using fibre lasers) and then remove and contain fuel rods. They already have a concrete truck reaching 44 metres to deliver water and the world longest...

http://news.yahoo.com/s/yblog_technews/20110413/ts_yblog_technews/upgrade-your-life-gadgets-under-25%0A Watch both segments, the software is second.

I'm trying to cool 8 ounces of 70 deg C water down to 38 deg C. I want to do this all in 2 minutes, but with as low a cost as possible. I was thinking of using a fan or air pressure of some short to do this. The only question I had is how do I determine the pressure or amount of air that I'll...

Homework Statement 433J of heat is extracted from a massive object at 0\circC while rejecting heat to a hot reservoir at 19\circC. What minimum amount of work will accomplish this? Answer in units of J. Homework Equations COP= Qc/(Qh-Qc) = Tc/(Th-Tc) The Attempt at a Solution...

PLEASE someone explain me in detail why gases cool on expansion? yOU may say that when they expand work is done at expense of internal energy but why? Wat is the need to do work when they are not forced to , I mean when they are not given external energy... Someone please explain the concept to...

f(x)=x^3 or f:\Re \rightarrow \Re r \rightarrow r^3 What are some other ways to define functions? Exotic and extraneous as possible. :wink:

I thought about doing a proof of the Pythagorean Theorem, a proof that the harmonic series is unbounded, a proof that e^π > π^e, a proof that e^(b*i) = cos(b) + i*sin(b), a proof that √2 is irrational, but honestly, none of those are cool enough. Please show me a cool proof that an ordinary...