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Old 12-23-2012, 08:20 AM   #10441
Stitchawl
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I think Stitchawl has that one!

If it was my turn to set a question, I might ask if you know the secret that I know about MobileRead. But since only the mods would be able to answer, or rather, wouldn't be able to answer (because it's a SECRET), I suppose it wouldn't be a very fair question.

What I can say is that you won't want to miss it, so keep an eye on the announcements forum over the next few days.

Which is the announcement forum?


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Old 12-23-2012, 09:01 AM   #10442
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Which is the announcement forum?


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this one http://www.mobileread.com/forums/forumdisplay.php?f=14
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Old 12-23-2012, 02:27 PM   #10443
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Fire.


Stitchawl

Yep. My next one will be a bit harder, I promise.

Your question, please.
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Old 12-23-2012, 06:35 PM   #10444
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We all know that certain colors are considered warm and other cool. Yellows and light oranges are called warm colors while blues are called cold.

Yet, these are actually, in fact, misnomers. Why?


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Old 12-23-2012, 09:15 PM   #10445
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Originally Posted by Stitchawl View Post
We all know that certain colors are considered warm and other cool. Yellows and light oranges are called warm colors while blues are called cold.

Yet, these are actually, in fact, misnomers. Why?


Stitchawl
Yellows and light oranges are closer to the infrared part of the electro-magnetic spectrum. These are the frequencies emitted by hot objects and when adsorbed heat the object. Blues are toward the ultraviolet portion of the spectrum.
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Old 12-23-2012, 09:34 PM   #10446
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Yellows and light oranges are closer to the infrared part of the electro-magnetic spectrum. These are the frequencies emitted by hot objects and when adsorbed heat the object. Blues are toward the ultraviolet portion of the spectrum.
Yes they are, but can you be a bit more specific about the heat and cold of these colors, rather than in which part of the spectrum they fall?


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Old 12-24-2012, 06:07 AM   #10447
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Is it to do with how much heat they reflect or absorb from sunlight or other heat source?
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Old 12-24-2012, 06:09 AM   #10448
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Originally Posted by Stitchawl View Post
We all know that certain colors are considered warm and other cool. Yellows and light oranges are called warm colors while blues are called cold.

Yet, these are actually, in fact, misnomers. Why?


Stitchawl
This is related to color temperature. The warmer an object is, the more blue light it emits. The warmer the object is, the colder we consider the light it emits to be.

For the technically interested on the forum:
The light radiation of a socalled black radiator is determined by the temperature of the radiator. The sun behaves as a black radiator and has a temperature of 6300 Kelvin. We say that the sunlight has a color temperature of 6300K. This light is considered warm. A warmer star can emit light with a color temperature of e.g. 8000K. This light will be more blue than the light from our sun, and is considered as "colder" light even though the star emitting the light is in fact warmer than our sun

Last edited by Iznogood; 12-24-2012 at 06:15 AM.
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Old 12-24-2012, 06:12 AM   #10449
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The peak of light emission from objects as they are heated moves from the red end of the light spectrum up to the blue end as the item gets hotter and hotter.

Something red-hot is colder than something yellow-hot. If you see something glowing blue from heat, it's VERY hot.
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Old 12-24-2012, 06:37 AM   #10450
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Everybody seems to have bits and pieces of the correct answer, but may be just verbalizing it in ways that don't seem to fit... So here's what I was actually looking for;

Quote:
We all know that certain colors are considered warm and other cool. Yellows and light oranges are called warm colors while blues are called cold.
Yet, these are actually, in fact, misnomers. Why?
We call these colors 'warm' or 'cold' based on the psychological response they cause rather than their actual temperature. When measured on the Kelvin scale, blue is very hot (not cold) and yellow is rather cool (not hot!)

To put it into a practical sense, just think of a flame. Blue flame is very hot, yellow flame much cooler.

So I have absolutely NO idea who has the full correct answer, but as a Christmas present, I offer any of you the next question! If you've got one handy, lay it on us!


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Old 12-24-2012, 06:44 AM   #10451
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How many squares can be found on a chessboard? (The answer is not 64.)
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Old 12-24-2012, 07:23 AM   #10452
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Can the squares overlap?
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Old 12-24-2012, 08:12 AM   #10453
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Can the squares overlap?
Yes, they can and do.
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Old 12-24-2012, 09:13 AM   #10454
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204

There's the 1x1s = 64
then there's the 2x2s = 49
the 3x3's = 36
the 4x4s = 25
the 5x5s = 16
the 6x6s = 9
the 7x7s = 4
and the 8x8 itself = 1


And so the pattern is the summation of n^2 with n ranging from 1 to 8.

I'm going to assume there's no border around the whole thing to add yet another 1.
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Old 12-24-2012, 12:44 PM   #10455
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Exactly right. The reason it's a sum of squares is because of the number of positions for the smaller squares along each side. The 7x7 square has two positions, so there are four positions in total. The 6x6 has three positions on each side, so there are nine positions in total.

By using this reasoning, one can easily see that there are
8^3+7^3+6^3+5^3+4^3+3^3+2^3+1^3 cubes in an 8x8x8 cube.

And so on, for higher dimensional objects.

Over to you, HIMS. Just don't ask what the MobileRead secret is!
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