Science & Mathematics - 16 December 2007

chromatography. why cant water or another liquid be used?

2007-12-16 10:37:32 · 1 answers · asked by sure222 5 in Biology

I need pictures of neon occuring freely in nature! Are the northern lights made up of neon?

2007-12-16 10:35:09 · 3 answers · asked by kitkat 2 in Physics

2007-12-16 10:30:45 · 3 answers · asked by stanley c 1 in Biology

This is a school project and my group members don't know. Please help.

2007-12-16 10:29:42 · 2 answers · asked by Anonymous in Biology

help

2007-12-16 10:29:12 · 1 answers · asked by SwimChick12 1 in Earth Sciences & Geology

where are the sensors typically located and how do they determine the intesity of the rain?

2007-12-16 10:28:36 · 6 answers · asked by cdcarola 2 in Engineering

Also, What is made in the Clavin Cycle and why? ^///^ I have a Biology final comming up and I can't find the answers to any of these in my notes or online... Thanks for helping me!!!

2007-12-16 10:27:08 · 1 answers · asked by lauranakf 2 in Biology

2007-12-16 10:26:53 · 1 answers · asked by ktblueangl 1 in Biology

2007-12-16 10:26:17 · 11 answers · asked by Anonymous in Mathematics

please

2007-12-16 10:24:11 · 0 answers · asked by Alexandrovna 1 in Botany

im stuck

2007-12-16 10:24:00 · 3 answers · asked by Anonymous in Mathematics

i heard someone say once that a mobile phone today is more technologically advanced than that tech. used in the apollo years.

2007-12-16 10:23:58 · 17 answers · asked by wave 5 in Astronomy & Space

4(t + 5) = 7 – 3t

2007-12-16 10:23:48 · 4 answers · asked by Diamond E 1 in Mathematics

2007-12-16 10:21:27 · 1 answers · asked by Dan s 1 in Medicine

2007-12-16 10:19:54 · 2 answers · asked by Jerry M 1 in Medicine

what is its max height?
What are its kinetic and potential energies when it has traveled 3/4 of the distance to its maximun height?
What is its velocity at this point?

2007-12-16 10:18:29 · 4 answers · asked by Chris 1 in Physics

2007-12-16 10:16:42 · 0 answers · asked by Anonymous in Astronomy & Space

i need to know the motion and force

2007-12-16 10:09:07 · 1 answers · asked by Anonymous in Physics

I need parasitism.
so far i have...
Mutualism: algae and fungi. fungi help algae in absorbing nutrients. algae help fungi with photosynthesis.

Commensalism: grass seeds attach to the fur of moose to get transported. the grass gets a free ride where as moose gets nothing.

2007-12-16 10:08:11 · 1 answers · asked by Anonymous in Botany

because i can't find one

2007-12-16 10:07:33 · 4 answers · asked by Lorraine 2 in Chemistry

2007-12-16 10:07:17 · 4 answers · asked by Anonymous in Engineering

2007-12-16 10:06:48 · 4 answers · asked by mattheweamer 1 in Astronomy & Space

how come i try to answer question somebody has beat me

2007-12-16 10:02:33 · 7 answers · asked by KAY L 2 in Astronomy & Space

If you are right 85% of the time, what is the probabilty of being wrong at least 1 time out of the next 7?
If someone can please tell me how to do it? This has been the only part of the entire book i havent been able to understand! :(

Thanks

2007-12-16 09:57:46 · 4 answers · asked by Epiphany 6 in Mathematics

Let f(x)=x^7 + x^6 + x^5 + x^4 + x^3 + x^2 + x + 1. What is the numerical remainder when the polynomial f(x^16) is divided by the polynomial f(x).

2007-12-16 09:57:41 · 1 answers · asked by Quagmire77 1 in Mathematics

A barrel has the shape of a cylinder, with top and bottom present. What is the maximum volume of the barrel that can be made using one square of material?

2007-12-16 09:56:44 · 1 answers · asked by swimmertommy 1 in Mathematics

In Portland, Maine, the tide causes the ocean's height to vary sinusoidally, peaking every 12.4 hours. The average high tide (the difference between the height at high and low tides) is 2.7m. Find an equation for the height, h, of the tide as a function of the time, t, in hours of if h = 0 at time t = 0.
Plz elaborate on how you solved it.
Also show all work that you did.
THANK YOU VERY MUCH!

2007-12-16 09:56:23 · 1 answers · asked by needsomuchHELP! 3 in Mathematics

I've heard about 'em, and that got me curious.

2007-12-16 09:56:22 · 10 answers · asked by Anonymous in Astronomy & Space

A student sits on a freely rotating stool holding two weights, each of mass 3.01 kg. When his arms are extended horizontally, the weights are 0.91 m from the axis of rotation and he rotates with an angular speed of 0.759 rad/s. The moment of inertia of the student plus stool is 3.01 kg·m2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.296 m from the rotation axis. Find the new angular speed of the student. Find the kinetic energy of the rotating system before and after he pulls the weights inward.

Please explaine how you arrived at the answer.

2007-12-16 09:56:22 · 1 answers · asked by K J 1 in Physics

I need to know where I messed up and how to get the right answers for the center, foci, major & minor axes.
The Original Equation:
36x^2 - 100y^2 - 72x + 400y = 3964
Factored:
18(2x^2 - 4x) - 100(y^2 + 4y) = 3964
After I add (-4/2)^2 and (4/2)^2 to the left side and 36 & -200 to the left:
18(2x^2 - 4x + 2) - 100(y^2 + 4y + 2) = 3964 + 36 -200
After I divided by 3800 on both sides:

(x-2)^2 - (y+2) = 1
----------- -----------
100 9

Last Format:

(x-2)^2 - (y - (-2))^2
---------- -------------- = 1
10^2 3^2

So I got a=10 b=3 h=2 and k= -2
So for the center = (2,-2)
Foci Points = (2-sqrt(109), -2) & (2+sqrt(109), -2)
and the major and minor axises: 20, minor=6

WHERE DID I GO WRONG???

I realize it seems like a lot, but it would mean so much. I finally thought I was getting math and everything "went wrong". I overlooked it myself more then 10 times and didn't catch anything. Please, I beg of you, explain what I did. Thank you very much!!!

Merry CHRISTmas!

2007-12-16 09:55:51 · 3 answers · asked by Anonymous in Mathematics