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 Posted: Thu Oct 09, 2008 11:16 am
1: Wien's displacement law, and Planck's Law when I'm searching for the amount and dominate wavelength of radiant energy from a black body that varies with temperature. Not comprehending it. ):
2: (2a + 3b - c) - (3a - 5b + 2c) <- How to solve that. I don't quite understand how you're supposed to arrange the numbers so that their letters match and you can subtract/add whatever.
And I might as well throw in:
3: My friend has disapeared for a week or two, which is strange because no matter what he always keeps his computer online with MSN running. Unless he blocked me (which would have a very low possibility as he showed no signs of being annoyed/angry at me), I can't think of any reason why he wouldn't be online. He is a college student, so I'm wondering if midterms for most colleges are coming up soon?
Will anyone help me? gonk
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Posted: Thu Oct 09, 2008 1:14 pm
I can probably help with number 2. Can you copy, verbatim, the book problem and what it asks for? Also, some videos about solving simultaneous equations.
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Aspirins And Alcohol Crew
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Posted: Thu Oct 09, 2008 1:55 pm
Text to go before each message
i know how to do it but i dont know how to explain it :/
and yes ver here its mid termy time
Text at the end of each message
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Posted: Thu Oct 09, 2008 2:16 pm
Hmm... *tries to solve math problem*
(2a + 3b - c) - (3a - 5b + 2c)
2a + 3b - c - 3a + 5b - 2c = -a + 8b - 3c [answer]
Ta-da? XP
All I did was distribute the subtraction sign to 3a - 5b + 2c. (When multiplying, remember that a neg. x neg. = pos & neg. x pos. = neg) Afterward, I combined the like terms.
Then again, I don't really know what the actual problem asks for. But I hoped I helped in some way.
FYI, I HATE math.
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Posted: Thu Oct 09, 2008 3:05 pm
Toast, was it a combine terms thing or a solve for a, b, and c thing?
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Posted: Thu Oct 09, 2008 3:51 pm
Oh wow, you guys are replyzillas today.
It says in the math book:
Remove parentheses and simplify
(2a + 3b - c) - (4a - 5b + 2c)
Joy, you almost got the answer right, it's actually -2a + 8b - 3c
What I'm confused about is.. how do you get those numbers? Aren't "like terms" supposed to be added/subtracted from each other? In that case, you can't add/subtract non-like terms so to do it from left to right.. isn't that impossible?
What confuses me isn't so much as the answer but how you're supposed to approach that if the like terms aren't near each other..
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Posted: Thu Oct 09, 2008 4:01 pm
I was just about to reply saying, "The suspense is killing me. Toast needs to get on and answer."
OK SO TO SIMPLIFY THAT... (I'm taking the numbers from the OP because those are the correct one for that answer.)
Step 1, state the thing to simplify:
(2a + 3b - c) - (4a - 5b + 2c)
Step 2, remove parentheses and distribute the negative sign in front of the second parentheses set. It makes the -4b positive because -(-5b)=5b.:
2a + 3b - c - 4a + 5b - 2c
Step 3, look at each term set (As and As, Bs and Bs, etc) and combine them:
2a - 4a = -2a
3b + 5b = 8b
-c - 2c = -3c
Step 4, list terms in abc order:
-2a + 8b -3c
That make sense?
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Posted: Thu Oct 09, 2008 4:11 pm
Ahh woops, I put 3a instead of 4a O:
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Posted: Thu Oct 09, 2008 8:18 pm
Well, that did kinda make sense.
But then when I tried doing it on my own..
Not getting it.
I think it'd be best if I get someone like one of my brothers, or my dad to sit down and watch me to see what I'm doing wrong. gonk
(Because otherwise, I'll just run in circles until I realize I made an obvious mistake.)
Now, does anyone here got any info on black bodies? Turns out there's no comprehendable info when I google it. ): I wish there'd be kid resources for things like this, they explain it in such an understable way.. Do they even teach kiddos about black bodies?
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Posted: Fri Oct 17, 2008 11:29 pm
D_Negel Ahh woops, I put 3a instead of 4a O:
Don't worry about it. You copied it wrong because Toasty copied it wrong from either her memory or the book. xd It's still up in the first post, too.
'Cause you would've gotten it right if it WAS a 3.
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