Science & Mathematics - 19 October 2007

well i narrowed it down to these to options

a change
or
nuclear fusion

2007-10-19 08:46:34 · 14 answers · asked by Anonymous in Physics

okay. i need to kno basicly everything.
in general. i need to know about quarks~~~who discovered them? when? what are they? how do they relate to an atom?....also i need to know about Murray Gell-Mann~who he is. and what he did and why he did it?.
and i need this in a basic view. nothing high tech. i have to teach it to my classmates. uh? also. any ideas on how to make a model of quantum mechanical?. thats a real stumper there!! thank you!

2007-10-19 08:38:02 · 4 answers · asked by Kake 2 in Physics

the same answer explains also the breaking of a glass cup when something very hot put in it

2007-10-19 08:35:39 · 3 answers · asked by manoura 1 in Physics

We are just talking about it and none of us can remember

2007-10-19 08:34:15 · 10 answers · asked by Anonymous in Zoology

The problem is 45y -7.8 = 15y + 7.2

Please show me the steps to solve the equation. I'm a little rusty.

2007-10-19 08:32:34 · 4 answers · asked by Dancer3d 4 in Mathematics

like that guy uri geller....please tell me websites that teach u for free.....if u know how to do it let me know ur ways

2007-10-19 08:31:54 · 13 answers · asked by Flying Monk 1 in Parapsychology

We have to have:
supply list (actually we have to provide the supplies)
Object of the game (how do you know who wins)
Rules for playing and scoring
step by step directions of how to play
Description of "sample space and sample size" ?????
Discussion of how the game is fair......include the probability for each player to win.

Any ideas????

2007-10-19 08:31:53 · 1 answers · asked by adnerb 4 in Mathematics

If a pine tree forest can change the environment to make it more suitable for a maple forest than a pine forest, how does it do this?

2007-10-19 08:31:37 · 2 answers · asked by lisa 2 in Botany

What is the derivative of 2^x ? Please explain

2007-10-19 08:30:54 · 13 answers · asked by Anonymous in Mathematics

PLEASE HELP ME I NEED IDEAS ON HOW TO MAKE A MODEL OF THE CORE,MANTLE AND CRUST

2007-10-19 08:29:33 · 12 answers · asked by ghggf 1 in Earth Sciences & Geology

I read they're growing human embryos under zero gravity and that some are a few years old. It further states that they look alien and all the organs settle differently in the biology due to the lack of gravity. Could the human body really survive that?

2007-10-19 08:29:18 · 4 answers · asked by Anonymous in Astronomy & Space

2007-10-19 08:27:51 · 6 answers · asked by dixitrajpara07 2 in Astronomy & Space

Afghanistan?

West
North
East
South

2007-10-19 08:26:39 · 5 answers · asked by Heather C 4 in Geography

2007-10-19 08:26:14 · 5 answers · asked by Miss I know it all. 1 in Astronomy & Space

2007-10-19 08:26:01 · 8 answers · asked by xiao l 1 in Biology

Please help me solve this integration problem 1/ (3sinx + 4cosx) dx

Please try not to use arc we havent got there yet

I started this problem by multiplying with the conjugate.. but i am stuck/ or made it worse lol

Please explain how you got your answer!

Thanks so much,

2007-10-19 08:21:00 · 4 answers · asked by Sarah 2 in Mathematics

How do you know whether an element's atom type is an isotope, ion, or neutral atom?

For instance, if Al (Aluminum) has the following properties, is it an isotope, ion, or neutral?:
Atomic #: 13
Mass #: 27
Protons: 13
Neutrons: 14
Electrons: 13

2007-10-19 08:20:41 · 5 answers · asked by Anonymous in Chemistry

I have spent an hour trying to do this... please help.

Note: ^ means to the power of

f:x --> e^(1-x^2)

The minimum values of f(x), as x varies between 0 and 2, are m and M respectively.

Show that M-m = 2.67





So far i have differentiatied f:x to give me -2xe^1-x^2
dy/dx must = 0 fo a stationary points and so i know that when x = 0 there is a stationary point, but where is the other??

2007-10-19 08:17:37 · 3 answers · asked by C4 Snake 3 in Mathematics

if your going to tell me "god did it" or "ready the bible"
I want to know HOW you think "god" made it
and the bible doesn't go into the details concerning the fairy tale of creation.

2007-10-19 08:16:05 · 13 answers · asked by Mercury 2010 7 in Astronomy & Space

If you don't know what I mean, just try it... it seems like it works best if you're close to the clock and you're chewing something crunchy. The other things around the clock and the rest of the clock don't jump, but the numbers or other lights on the clock look like they're dancing around. Why just those?

2007-10-19 08:15:26 · 3 answers · asked by Anonymous in Other - Science

In the winter of 1945 Elie Wiesel had to march From Buna (Auschwitz III) to Buchenwald. How far was the distance?

2007-10-19 08:15:01 · 4 answers · asked by smart_lil_gyrly 2 in Geography

2007-10-19 08:13:26 · 13 answers · asked by Ivan Zell 1 in Mathematics

In other words, how did we test out the environment outside the spacecraft before we had a spacewalk?

2007-10-19 08:13:25 · 2 answers · asked by Jansen J 4 in Astronomy & Space

4/x - 3/y = 8
5/x - 8/y = 13

I usually excel in math. I understand systems but I didn't understand how to solve this one. I just want to understand the process by which to do this, so help and explanation will be extremely appreciated.

2007-10-19 08:13:05 · 7 answers · asked by Anonymous in Mathematics

2007-10-19 08:10:00 · 10 answers · asked by xiao l 1 in Biology

The number of yeast cells in a laboratory culture increases rapidly at first but levels off eventually. The population is modeled by the function below, where t is measured in hours. At time t = 0 the population is 30 cells and is increasing at a rate of 21 cells/hour.

n = f(t) = a / 1+be^-0.8t

a) Find values for "a" and "b"
b) According to this model, in the long run the yeast population stabilizes at ______ cells.

2007-10-19 08:09:04 · 4 answers · asked by Mike O 1 in Mathematics

2007-10-19 08:07:42 · 4 answers · asked by Anonymous in Engineering

Let V be a vector space, V X V the product vector space and Z = {(x,x): xeV}. called the diagonal of VXV . Prove that Z is a linear subspace of V X V and that (VXV) / Z is isomorphic to V

your help is appreciated

2007-10-19 08:07:29 · 4 answers · asked by Anonymous in Mathematics

A rectangle has a width that is 2 more than three times the lenght. The perimeter measures 92 units.

2007-10-19 08:06:17 · 8 answers · asked by davidiscool@sbcglobal.net 2 in Mathematics

Aluminum rivets used in airplane construction are made slightly too large for the rivet holes to be sure of a tight fit. The rivets are cooled with dry ice (-78.5°C) before they are driven into the holes. If the holes have a diameter of 0.6350 cm at 21.4°C, what should be the diameter of the rivets at 20.5°C if they are to just fit when cooled to the temperature of dry ice?

Ive been trying to figure this one out, if any physics guys know what is going on it would be greatly appreciated. Thanks.

2007-10-19 08:02:56 · 1 answers · asked by Anonymous in Physics