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Topic: How do I work this problem?  (Read 3345 times)

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Offline ljuvlig

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How do I work this problem?
« on: June 07, 2012, 01:20:38 AM »
First off, sorry for not describing the problem in the topic title.. I wouldn't know how.



How do I begin to work this problem? I assume I need to simplify each side as much as possible but I don't know where to start.

The questions are "What is the value of A" and "What is the value of B?".
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Offline Hunter2

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Re: How do I work this problem?
« Reply #1 on: June 07, 2012, 02:40:03 AM »
You divide the 6.626 by9.11 gives A.

The same you do with the 10x terms.
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Offline Hunter2

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Re: How do I work this problem?
« Reply #2 on: June 07, 2012, 08:39:02 AM »
I forgot the 3 ;D.

6.626/(9.11 x3) = A
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Offline ljuvlig

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Re: How do I work this problem?
« Reply #3 on: June 07, 2012, 10:13:20 AM »
OK, so if I am correct, I have this equation: .2424 x 10^-9

But, what is up with the kg * m^2? Obviously those are units but what does it mean to multiply them?

Note: I simply divided the 10^6 on bottom when I did the other two exponents.
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Offline Hunter2

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Re: How do I work this problem?
« Reply #4 on: June 07, 2012, 10:18:15 AM »
The result is ok

The units you also have to multiply or divide. You talking about a wave length. What is a unit for a wave length.
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Offline ljuvlig

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Re: How do I work this problem?
« Reply #5 on: June 07, 2012, 10:29:58 AM »
Quote from: Hunter2 on June 07, 2012, 10:18:15 AM
I would change the number to 2.425 x 10-10

The units you also have to multiply or divide. You talking about a wave length. What is a unit for a wave length.


I would say for the wavelength, we'd use either nanometers or meters.
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Offline Hunter2

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Re: How do I work this problem?
« Reply #6 on: June 07, 2012, 10:33:45 AM »
I changed it back, because here not necessary

Simple mathematics

0.2424 x 10-9 = 2.424 x 10-10

yes correct nanometer for wavelength. Also prove it with your units you have.
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Offline ljuvlig

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Re: How do I work this problem?
« Reply #7 on: June 07, 2012, 10:41:35 AM »
Quote from: Hunter2 on June 07, 2012, 10:33:45 AM
I changed it back, because here not necessary

Simple mathematics

0.2424 x 10-9 = 2.424 x 10-10

yes correct nanometer for wavelength. Also prove it with your units you have.

OK, given the equation, 'kg' stays just as 'kg' and the 'm/m^2' is simply 'm'. Would it be correct to express this as 'kg per m/s'? I can't see how else the kg would come into play. Also, can't I just put 'm/s' given that they are the same units just different measurements?
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Offline Hunter2

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Re: How do I work this problem?
« Reply #8 on: June 07, 2012, 10:45:05 AM »
kg*m2/s = Newton = force, kg = mass, m/s = velocity


You have (kg*m2/s)/(kg*m/s) You can eliminate everything beside one m.

So the result is 0.2424 x 10-9 m and this is.... Bingo.
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Offline ljuvlig

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Re: How do I work this problem?
« Reply #9 on: June 07, 2012, 10:55:14 AM »
Quote from: Hunter2 on June 07, 2012, 10:45:05 AM
You can eliminate everything beside one m.

So the result is 0.2424 x 10-9 m and this is.... Bingo.

I see that now. Sorry for needing so much help. I never took Chem in high school and this is my first time taking it in college. It's going to be a long summer, but you learn as a you go. Thanks.
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Offline Hunter2

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Re: How do I work this problem?
« Reply #10 on: June 07, 2012, 10:56:29 AM »
10-9 is called also nano

So the result is 0.2424 nm
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