Science & Mathematics - 23 December 2007

I know that there has been great controversy over the irritating - and some claim carcinogenic - effects of Sodium Laurel Sulfate. But who (chemist, or perhaps a company) first discovered that the chemical was a great foaming agent and cleanser?

2007-12-23 05:42:20 · 2 answers · asked by tea 2 in Chemistry

2007-12-23 05:42:10 · 5 answers · asked by Anonymous in Engineering

2007-12-23 05:34:31 · 8 answers · asked by lovelybrain 1 in Engineering

I have owned a C-11 on a german equatorial mount for several years now. It tracks beautifully, and I am considering expanding into photography. Pretty sure I want to go with a CCD approach, but my concerns are:

1. Color or monochrome with multiple exposures and filters? I've heard color is getting better in terms of fine detail - any experiences worth relating?
2. Do I need to take a laptop to the site? I have one, but it might get messy. What are the advantages / disadvantages?
3. What do I need for guiding?

I don't know much about it. I will also be working with my club and my telescope dealer friend, but every opinion helps. My long-term interests are in the area of deep-sky objects, although some lunar / planetary shots would be great and would obviously be easier in terms of exposure time, tracking fatigue, etc..

Thanks for your help!

2007-12-23 05:32:25 · 5 answers · asked by Larry454 7 in Astronomy & Space

How much time after the sun will stop lighting.

2007-12-23 05:21:56 · 10 answers · asked by kul 1 in Physics

Use the Intermediate Value Theorem to show that the polynomial function below has a zero in the given interval.

f(x) = x^4 + 8x^3 - x^2 + 2; [-1, 0 ]

2007-12-23 05:17:30 · 5 answers · asked by journey 1 in Mathematics

2007-12-23 05:17:22 · 3 answers · asked by Anonymous in Other - Science

I can understand why dog poo looks different from horse poo as they eat different things. Sheep and cows eat the same food (grass) and both even ruminate (chew their cud) but their poo looks VERY different.

2007-12-23 05:14:52 · 13 answers · asked by Anonymous in Zoology

I have pulled up several different US maps off
the google & internet sites. They did not even show the Lakes per say or which lake was which.

2007-12-23 05:14:13 · 4 answers · asked by Sonny 2 in Geography

I heard that if your building was made before 1978, you could have more lead in your water. Now what are these black rubbery looking little chunky things that build up in the showerhead, and even the sink water tap gradually? is this lead? or rubber? what is normal now.

2007-12-23 05:13:35 · 4 answers · asked by Anonymous in Earth Sciences & Geology

200# steam at 500deg F. There theoretically should not be any condensate but there should still be a drip leg. How do calculate the condensate load.

2007-12-23 05:10:02 · 2 answers · asked by drew 2 in Engineering

Friendzzz.........
M' interested in chemical reactions,wether they are of Acids and Bases,Acids and Metals or Acids and Alcohols or any other.Can u tell wether this is Organic or Inorganic Chemistry?????

Thanxxxxxxxxxx 4 helping.

2007-12-23 05:09:58 · 2 answers · asked by Anonymous in Chemistry

I am a closet beliver, meaning I would never discuss these things in real life, but I just had my second spirit guide experience, can anybody else relate to this type of xperience

2007-12-23 05:07:35 · 6 answers · asked by Anonymous in Paranormal Phenomena

2007-12-23 04:57:18 · 3 answers · asked by Janna 4 in Mathematics

I think this is true. What do you think?

2007-12-23 04:55:51 · 5 answers · asked by Neomaxizoomedweebie 3 in Botany

Does anybody know the vapour resistance value of Perlite?

2007-12-23 04:49:54 · 1 answers · asked by Webbsr1 1 in Engineering

2007-12-23 04:46:04 · 11 answers · asked by jaykirs36 1 in Physics

2007-12-23 04:41:25 · 3 answers · asked by delightfulldee71 1 in Mathematics

Please help. I am running out of time, I take the MCAT in a few months and the verbal is still kicking my behind. I have no problem with the sciences, just the verbal. Please help. Thank you!!

2007-12-23 04:35:24 · 4 answers · asked by Anonymous in Medicine

2007-12-23 04:34:17 · 7 answers · asked by sheshu 1 in Earth Sciences & Geology

2x-1/1 – 2x

2007-12-23 04:30:08 · 4 answers · asked by Marcia O 1 in Mathematics

A) +69

B)+46

C) 3±7
D) -3+7

2007-12-23 04:28:15 · 9 answers · asked by delightfulldee71 1 in Mathematics

John likes 400 but not 300, 100 but not 99 and 3600 but not 3700. Which does he like?
A. 900
B. 1000
C. 1100
D. 1200

When you answer, I want you to say why you think it is this answer.

2007-12-23 04:22:41 · 7 answers · asked by browneyedgirl_1985 1 in Mathematics

2007-12-23 04:21:41 · 3 answers · asked by aditya 62 1 in Chemistry

2007-12-23 04:20:30 · 3 answers · asked by rajev v 1 in Engineering

f(x) = -3x +9
g(x) = 8x +7

Find f(x) +g (x)

can you show me how to solve this?

Thank you for your help.

2007-12-23 04:18:01 · 7 answers · asked by Anonymous in Mathematics

Can someone please help me describe the movement of
water and energy in a wave in the middle of the ocean? Thank you!

2007-12-23 04:15:21 · 3 answers · asked by Anonymous in Physics

2007-12-23 04:14:52 · 4 answers · asked by limefurrypuppy 1 in Zoology

2007-12-23 04:12:52 · 3 answers · asked by S i r i 1 in Medicine

The length of one of the equal legs of an isosceles triangle is 3 inches more than 2 times the length of the base. If the perimeter is 31 in, find the length of one of the equal legs.

I am helping my son with his home work and need help with a few questions. Fastest correct answer wins 10 points.

2007-12-23 04:08:13 · 7 answers · asked by mommie2b0610 3 in Mathematics