Cool Definition and 285 Threads

Coolness is an aesthetic of attitude, behavior, comportment, appearance and style which is generally admired. Because of the varied and changing connotations of cool, as well as its subjective nature, the word has no single meaning. It has associations of composure and self-control and often is used as an expression of admiration or approval. Although commonly regarded as slang, it is widely used among disparate social groups and has endured in usage for generations.

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  1. E

    What is the Best Material for Keeping Food Cool in Insulated Boxes?

    Hello again. I come with another physics concept I am struggling with. At first I thought I understood this but the more I think about it the more confused I get. Help! This post is with regard to the insulated 'Keep it Cool' boxes you can buy for taking on picnics or carrying cans of...
  2. P

    Another cool optimization problem

    Homework Statement find the dimensions of a rectangle with perimeter 100m whose area is as large as possible Homework Equations area = XY 100 = 2x + 2y y= 100/4x x(100/4x) (400x - 400x)/16x^2 1/16x^2 = 0 The Attempt at a Solution well... am lost
  3. C

    Find the Mass of Ice Needed to Cool 800mL Water to 0.0°C

    Homework Statement Ice at 0.0°C is mixed with 8 × 102 mL of water at 28°C. How much ice must melt to lower the water temperature to 0.0°C? Homework Equations Q = mc(delta)T The Attempt at a Solution c = 4.184 J/g K (delta)T = -28C V = 800 mL I'm not sure what to do since...
  4. Ivan Seeking

    Cool Video: Meteor Hits NW Ground

    A meteor that came down in the NW this morning was caught on camera. A pilot reported seeing it hit the ground.
  5. P

    Hot water can cool faster than cold

    Experiments have been done in which one volume of water that is warmer than an identical volume of water freezes faster than the cooler volume.Since ice is an ordered structure compared to liquid water does this mean that the walls of the vessel containing the warmer water are able to interact...
  6. P

    Why Did Temperatures Drop Despite Identical Sunny Skies?

    Suppose in summer, two consecutive days, the first was hot at 30 centigrade, the second at 20 centigrade. Both was cloudless in the afternoon. There haven't been any rain prior to the days nor after for about a week. What caused the second day so much cooler then the first even though they...
  7. J

    Energy transfer from cool part to hot part(q38)

    For this question: http://tinyurl.com/3bozr6 the answer is c. Can anybody kindly explain how this is achieve by refrigerator? Because according for what I study so far , the energy is transfer from hot part to cool part...
  8. EnumaElish

    Why do a plant's leaves feel cool?

    Plant leaves are cool to the touch. In fact, that's one way of verifying whether it's a real plant. Can anyone explain why living plants feel cool?
  9. J

    Keep Cool in Summer: AC + 3 Portable Fans

    I have an air conditioner running and also 3 powerful portable fans on me at 12 oclock, 4 oclock and 8 oclock 3 ways if u know what i mean. Do these portable fans add too much extra heat into the room to make them inefficient and an air conditioner on its own more efficient?
  10. Astronuc

    Manufacturing - Cool things being made

    The National Association of Manufacturers has a blog, which lists videos of things being made. http://blog.nam.org/archives/coolstuffbeingmadecom_weekend_video/ How steel is made - tp://www.webcastgroup.com/client/start.asp?wid=0671017062835 Enjoy.
  11. Ivan Seeking

    Cool DC motors for electric vehicles

    There seems to be quite a dramatic price range for high power DC motors, and I was thrilled to find this link while searching for solutions for a work application. The prices blew me away when compared to those found at the standard motor suppliers...
  12. W

    Principle of Mechanics Book: Intermediate Course Material?

    Ok so I found this cool book entitled: Principle of Mechanics by SYNGE & GRIFFITH,McGraw-Hill, 1959. It looks really mathematically rigourous. It covers Space Mechanics, Plane Mech, etc. My question is, what course would this stuff be taught in? It has Halmiltonian mechanics as well as Lagranian...
  13. K

    Is the Angry Professor Against Cell Phones Cool?

    http://www.aolvideoblog.com/2007/05/11/angry-professor-vs-cell-phone/ I wonder where this guy teachs.
  14. C

    Problem: Calorimetry Mass of Water Needed to Cool Engine

    Homework Statement Given the specific heat of water is cw=4180 J/kgC A 241 kg cast-iron engine contains water as a coolant. Suppose the engine's temperature is 31C when it is shut off and the air temperature is 15C. The heat given off by the engine and water in it as they cool to air...
  15. I

    Cool research: quantum secrets of photosynthesis

    For a press release about a cool looking paper: http://www.netscape.com/viewstory/2007/04/12/quantum-secrets-of-photosynthesis-revealed/?url=http%3A%2F%2Fwww.lbl.gov%2FScience-Articles%2FArchive%2FPBD-quantum-secrets.html&frame=true
  16. C

    Model to predict time needed to cool down steel billets.

    Hi, I´m looking for a model or formula to calculate the time that is needed to cool under natural conditions (not forced air flow, water, etc.) a pile of steel billets produced at a melt shop. The process is as follows: steel billets with square cross section of 140 mm x 140 mm and 12.7 m...
  17. 5

    Can Gasoline Help Cool Air? A Theory and Discussion

    This is just a random question and I know you guys will have the answer:) I had read somewhere in the past that the 'molecules' in gasoline help keep the gasoline fluid cooler than the ambient air around it. Now (assuming that is true), could you possibly pass air over it (using a fan) and...
  18. B

    AI Prog: Really Cool, Catch it Out & Humorous

    http://www.titane.ca/concordia/dfar251/igod/main.html Not sure if ye already know about this. I think its brilliant. Pretty easy to catch it out with a question it can't answer but still really well made. Cracker sense of humour too!
  19. A

    Where Can I Watch 'The Mechanical Universe...and Beyond' Online for Free?

    I don't know how many of you remember watching the video series "The Mechanical Universe...and Beyond" as physics undergrads. But my professors used this on occasion, and I found their illustrations to be extremely helpful in understanding certain principles in physics. And the historical...
  20. Ivan Seeking

    Is Your Elf as Cool as This One?

    Eat your hearts out http://www.elfyourself.com/?userid=9f6f79bb9845485dfaf3887G06122122
  21. A

    Can you cool off the kitchen by leaving the refrigerator door open?

    Alright, I'm stuck on a few problems with a physics brain teaser sheet. 1. Suppose you have a very small kitchen with a refrigerator. Can you cool off the kitchen by leaving the refreigerator door open? 2. Which bracing for a screen is strongest: two vertical bars, one horizontal bar...
  22. L

    Cool 3-D functions for graphing

    I am collecting nice 3-d functions to demonstrate graphing tool, if anyone have great functions which will look great on 3-d plotting, please let me know. Here are few equations I am using now. If you guys need I can provide a link to plot each of these graphs. (01) x*y^3-y*x^3 (02)...
  23. L

    Cool 2-D functions for graphing

    I am collecting nice 2-d functions to demonstrate graphing tool, if anyone have great functions which will look great on 2-d plotting, please let me know. Here are few equations I am using now. if you guys need I can provide a link to plot each of these graphs. The plotting program I am using...
  24. Cyrus

    Cool RC Jet Stuff - Too Pricey for Me

    Cool RC Jet stuff, but out of my price range. :frown: They are about 10-20k per airplane. [PLAIN]&mode=related&search=[/URL] But worth every penny. [PLAIN]&mode=related&search=[/URL] Inside the jet, pretty neat...you can really hear that jet engine spool up in flight. [PLAIN][/URL]
  25. M

    Music Toccata & Fugue: Bach's Cool Music

    This is really cool! (Toccata and Fugue) http://video.google.com/videoplay?docid=3046237801789240996&q=bach+fugue
  26. N

    Solar Chimney: Design 2KW/Day in California

    http://alt-e.blogspot.com/2004/11/solar-chimney-for-california.html Anybody have some idea of the calculations that go into designing something like this? I'm kinda wondering how big it would need to be to get 2KW a day out of it.
  27. D

    Can an Air-to-Air Intercooler Cool Air Below Ambient Temperature?

    Hi, Can a radiator ie: air to air intercooler in a car (or industrial application) cool the air passing internally through it cooler than the ambient air passing externally through it without the aid of liquids. Thanks Darren
  28. M

    Can hugging a hot-water bottle really help with pain relief?

    Through my casual surfing of news sites I've come across this article, and I thought that it's really cool. For those of us who were curious as to why a little bit of heat can help reduce pain: . http://news.bbc.co.uk/2/hi/health/5144864.stm
  29. rcgldr

    Did the Volkswagen Polo prove its toughness in this video?

    Young kid dreams about a Corvette: vtdrm.wmv Volkswagen Polos are tough: http://jeffareid.net/misc/vwbmbr.wmv
  30. wolram

    Are Mosquito Torches the Ultimate Solution for Repelling Bugs?

    http://www.electricstuff.co.uk/marxgen.htm Danger might like this site.:smile:
  31. W

    What do you think of http://www.webqc.org?

    Hello! Please evaluate my web portal http://www.webqc.org" and tell your opinion. Thank you in advance!
  32. M

    Keep Pets Cool in Summer: Insulating Dog Coats

    Keeping cool :confused: Alright I know that this is a strange question but I and my phd chemist father don't understand this. Here it is and don't laugh. I was going to shave my dog because well summer is here and it would be nice to keep him cool. Strangely enough every single place I go...
  33. Pengwuino

    The B Word: What's Going On Here?

    Something I've been noticing a LOT lately is people who have bumper stickers that say "B**** on board" or "49% B****, 51% sweet, DON'T PUSH IT" or some other saying... with of course, no ****'s. What's going on here? I thought girls were offended when they were called B's? It's all of a sudden a...
  34. Ivan Seeking

    What is an HDD for TV and how can it upgrade your viewing experience?

    We finally had to upgrade and buy a new DVD recorder/player for the TV. We were still using VHS, which died, so we got that with the DVD, but we also got a HDD, which I thought was just for the live pause. I didn't even realize at the time what an 80 Gig HDD meant for recording time; I noticed...
  35. dduardo

    View Rendered Source: Cool Firefox Extension for Web Developers

    I'm sure any web developer would appreciate this extension: http://jennifermadden.com/scripts/ViewRenderedSource.html
  36. S

    NationMaster: Statistics for Everything

    Cool statistics site for statistics for just everthing. http://www.nationmaster.com/index.php
  37. A

    Are You Ready to Test Your Mind with 20Q?

    http://20q.net/ Think of an object, and then answer 20 questions about it while the AI software tries to guess what you're thinking of. The software will guess right most of the time. You can also buy a handheld version of this game.
  38. E

    Looking for a cool Chemistry Project

    Our Chem AP teacher is looking for a cool chem project that we can do (preferably in groups). The reason being that the Physics AP class always gets to do cool stuff (and show it to parents and stuff) and we are just stuck in a lab for most of the time. But it's hard to come up with something...
  39. D

    Exploring Alternative Ways to Cool Electronics: Light Waves?

    There must be another way to remove heat from electronic equipment rather than passing cool air over the surface? What about light waves? Can they cool a surface? Can they absorb heat, reflect away heat? Any one have any lateral thoughts?
  40. H

    Cool category construction: Q-trees

    Hurray for an alliterative title. I guess I'll have to apologize in advance if you don't like logic-type stuff, but I thought these were pretty cool! A Q-sequence is basically a formal-logic-like thing you can do in any category. The basic example is that of a diagrammatic definition...
  41. B

    Will Salt help cool a cars radiator?

    Today while sitting parked in my FIL's van, the one I just put a new thermostat in, but failed to really test to see if it would overheat? A couple miles down the road, it pegs the temp guage. I put the OEM of 192* instead of 160* because it wasnt passing smog, they said the computer this/that...
  42. T

    Are You Familiar with the Guidelines for Posting on Physics Forums?

    if you take the time to read this website all of the recorces are very well labled usually after any thing or any points in modern physics are brought up. [crackpot link deleted] tiz very cool, cool indeed. "stupid people do stupid things, and smart people try to out-smart...
  43. S

    Calculate Charge on Electron from Milliken Oil Drop Data

    Milliken Oil Drop Problem anyone? Help please. Can some one help me with this Milliken oil drop problem. Data from a Milliken oil drop experiment are given below. Calculate the value of the charge on an electron from this data: Voltage needed to suspend drop (V) Drop diameter (microns)...
  44. Ivan Seeking

    Why is it cool to hold your crotch?

    I keep seeing this commercial from Best Buys with The Black Eyed Peas. The lead singer looks like he has to go to the bathroom. :smile: Sorry, my software for work was delayed and my finger hurts too much to work on the bathroom, so I notice these things. :biggrin:
  45. C

    Beard Keeping You Cool in Summer?

    I was watching a ball game and the pitcher had a full thick beard. I wondered why you would have a beard in the summer time because of how hot it would be. My cousin told me that it would keep you cooler. Any reason why I should believe this? It doesn't make sense to me.
  46. mattmns

    Expert minesweeper with a cool 81

    Finally broke into the 80s in expert minesweeper with a cool 81! Here is the video, my first sub 90, and it was almost a sub 80 :smile: http://img310.imageshack.us/my.php?image=mattmnsexpert814ur.swf
  47. B

    Cool Question about the doppler effect

    If you are driving in a car up to a set of trafic lights that are red, how fast would you need to be going to make the lights appear green? (take the velocity of light to be 3x10^8 ms-1 and the wavelength of red light to be 620nm and the wavelength of green light to be 540nm) Ive calculated...
  48. F

    Cool Animations of viuses attacks

    Hello, i am doing an assignment about virus attacking human beings. Have you ever watched any simulations, or know places to those animations ? Please tell me what software or placews to watch abuot viruses attacking human beings. I need to see how they do it. Any kind of attacking by any...
  49. Y

    Cool feelings where are you from

    Yes , I made mistakes because I couldn't recognize the two iron bars, and mistakenly laid my hand on a hot but soft one, got burnt a little but its okay for me though, since we all can immediately draw our hand back in such situations. I came to see my doctor right then and he gave me some...
  50. M

    Why Is Our Blood Red and How Does Induction Heating Work?

    Read this article.. http://www.exn.ca/dailyplanet/story.asp?id=2005041952
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