12-23-2012, 08:20 AM | #10441 | |
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Which is the announcement forum? Stitchawl |
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12-23-2012, 09:01 AM | #10442 |
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12-23-2012, 02:27 PM | #10443 |
Is that a sandwich?
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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? Stitchawl |
12-23-2012, 09:15 PM | #10445 |
Nameless Being
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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.
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12-23-2012, 09:34 PM | #10446 | |
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Stitchawl |
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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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12-24-2012, 06:09 AM | #10448 | |
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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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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. |
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:
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! Stitchawl |
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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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12-24-2012, 07:23 AM | #10452 |
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Can the squares overlap?
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12-24-2012, 08:12 AM | #10453 |
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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. |
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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