# sysD

Senior Members

125

1. ## Quick Log Question

Ok, so I'm a bit stuck. Here's the problem: log(base9)(x-6) + log(base9)(x+2) = 1 Here's my work. At first i simply tried to solve by rooting: (x-6)(x+2) = 0 x = 6 or x = -2 But realized this would not work, as any rooting would result in having one of the logarithms above yield an invalid result (eg. log_9(0) ) I've tried another way (isolating x), but I'm stuck. (x-6)(x+2) = 0 x^2 + 2x - 6x - 12 = 0 x^2 -4x = 12 The only thing I can think of doing at this point is x - 2(x^(0.5)) = 12^(0.5) And that's kind of useless (i think). Any ideas?
2. ## Log Question (maths)

Ahh, yes, I see. Defining "n" in this case as "the time, in years, it would take for the second amount to equal the first" would have circumvented this issue. Alternatively, if I were to use the book's method, "n" would be defined as: "the time, in years, it would take for the first amount to equal the second."

16. ## Log Calculator

Thx giaz oh, and i love you.
17. ## Log Calculator

Heyo, Anyone aware of a calculator out there on the internet with capacity to calculate logarithms with non-common bases? i.e. log(base2)4(16^(1/3)) - log(base4)0.25^(1/3) = x Yes, yes, I know x=11/3 I just want a quick way to check my answers. Alternatively, is there a quick and easy way to convert non-common bases to common bases? (base10)
18. ## Josh Solomon Goes Black on Oprah

lol furry palms. and yes i know its in the wrong forum thats why i asked a mod to move it to the physiology forum...nothing yet tho... way to loaft, mods. *shakes fist at sky*
19. ## Josh Solomon Goes Black on Oprah

May be Cathaxanthin; sent emails to staff of Oprah requesting comformation. Status:pending Jan22/2011 Recently I saw an episode of Oprah in which Oprah claims a young white male consumed "life-threatening pills" in order to darken his skin. The result of this was said to be a reddish-brown pigmentation of the skin. A clip of the topic on the show: http://www.oprah.com/oprahshow/Black-for-a-Day-Video Your website also references the topic on these pages: http://www.oprah.com/oprahshow/Race-on-The-Oprah-Show-A-25-Year-Look-Back/print/1 http://www.oprah.com/oprahshow/Race-on-The-Oprah-Show-A-25-Year-Look-Back/5 This has been a source of interest to many people. Did Joshua consume Canthaxanthin? This would explain the "life-threatening" remark, as such medications remain unapproved by the FDA. I look forward to your reply, -Yoshi Yamagoto Notes: Cathaxanthin : http://en.wikipedia.org/wiki/Canthaxanthin -Brown-orange in color -Fat soluble -Attaches to sub dermal fat -Becomes more visible when fat is saturated -May cause liver damage -May cause yellow deposits in eyes -May cause rashes and hives
20. ## Josh Solomon Goes Black on Oprah

75 Views and No Replies?
21. ## Josh Solomon Goes Black on Oprah

SOURCE: OPRAH http://www.oprah.com/oprahshow/Race-on-The-Oprah-Show-A-25-Year-Look-Back/5 Okay, so this dude goes on Oprah awhile back, and claims that he took some "life threatening pills" to change his skin colour black. Is this even possible? It seems like horsecrap. He said his skin was reddish-brown. \ (Cite Sources Please)
22. ## Deposition of Cigarette Smoke

This is true. A filter would be used to seperate solids and junk like that. What I'm after here is a feasible technique to turn vapours back into liquids or solids.
23. ## What is the result of a logarithm called?

(Other than the exponent.) Anyone?
24. ## Deposition of Cigarette Smoke

I'm also a smoker and got this idea as I watched the bottom of my cotton filter turn a steadily darker color Ah, but here's the catch - Some particles have been vapourized. Such as nicotine. Engineering a device to depose the vapour back into a solid (including minimal leftover nicotine from the secondhand smoke) seems to be possible via supercooling these vapour particles within a vacuum. I was wondering if there was an easier way to achieve this. I wasn't able to find any information on why brass would turn silver. My guess is that your mouthpiece is made of nickel with a brass coating (or laquer), or some type of brass/nickel alloy. This would work, but by this exercise I also hope to discover the measure of chemicals absorbed through the lungs per second. Obviously this will only focus on a few of the many chems within ciggys (ie. arsenic, CO, CO2, and nicotine). I hope to achieve this by first taking a control sample - the measure of chemicals emitted by a single cigarette at different stages of its burn cycle. The smoke will ideally be inhaled through various filters via suction. i. Samples with recirculation will be differentiated from those without in order to better measure the effects of smoking indoors vs outdoors. ii. (As a cigarette is inhaled, resin collects closer to the base of the cigarette, which, when smoked, tends to be stronger than the rest of the cigarette. Therefore, I hypothesize whether or not people finish entire cigarettes is indeed a factor in health applications.) Each sample will be collected for 60 seconds. This will make it easier to find how many chemicals have been deposed, per second.
25. ## Deposition of Cigarette Smoke

Hey all, I want to collect, in a chamber of some sort, the secondhand smoke of many smokers. The goal of this is the deposition of most, if not all, chemicals and tar. How can this be readily achieved? (And yes, I have used google.) Are there certain substances that will not deposit? I'm not asking for a complete list, seeing as how there are myriad substances within cigarette smoke, but a few examples would be handy. Also, why would they not deposit? The goal is to render as pure of a deposit film as possible. Can this be achieved?
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