Cool Definition and 276 Threads

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...

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?

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?

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.

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...

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...

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

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...

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

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...

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...

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!

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...

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

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...

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)...

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...

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]

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

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.

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

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

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

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

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...

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...

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...

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

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

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.

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...

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?

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...

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...

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...

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)...

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:

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.

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

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...

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...

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...

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

Trying to beat the heat of summer, a physics grad student went to the local toy store and purchased a child's plastic swimming pool. Upon returning home, he filled it with 200 liters of water at 25 C. Realizing that the water would probably not be cool enough, he threw ice cubes from his...

I came across this neat page and they are calling it a 'Zoomquilt'. It is just way too cool! Check it out! ENJOY! :biggrin: http://www.eviltree.de/zoomquilt/zoom.htm

"Dark-matter $100000 prize, Prove dark matter is needed and win!" 033 hits to date (http://www.darkmatterprize.net/ ) Personally I think a) he doesn't have $100k, and b) this might form the basis for an interesting set of 'extra credit' assignments for an undergraduate Physics/Astronomy...

cool reaction! Hi there, I am going to have to make a presentation for my English class next month, and since we are allowed to do about anything I was just looking around for some cool ideas and maybe some explination of what happened. Yes it is for my English work. I reaction must be...

Feel like you need a little humbling? This test is based on flash movies -- so you'll need a browser plug-in to run it - http://hjem.get2net.dk/mick.langhoff/flash/iq3.swf

I like them, they're kinky. And they bring out my eyes. :-p

How many people could fit into the largest office building in the world? Assume that everybody must be standing on the floor. :rolleyes: Very Cool Question but its kinda hard. I've looked up the largest office building which is the Pentagon! however i don't know the area of that place :S...