Science & Mathematics - 4 January 2007

2007-01-04 12:18:05 · 4 answers · asked by Zelda Hunter 7 in Astronomy & Space

2007-01-04 12:17:36 · 3 answers · asked by silenthill 1 in Astronomy & Space

Let f be defined in the real numbers as f(x) = 3x^2-2x+5. Find the lim f(x)-f(a)/(x-a) when x --> a.

2007-01-04 12:16:18 · 4 answers · asked by Anonymous in Mathematics

which would be more damaging to your car: having head-on collision with an identical car traveling at an identical speed or driving head-on into the Vehicle Research Center's 320000 pound deformable crash barrier?

can you explain?

2007-01-04 12:16:02 · 6 answers · asked by Alex M 1 in Physics

2007-01-04 12:15:28 · 2 answers · asked by chanti 3 in Chemistry

Student C measures distances to a dye spot and to the solvent front from the lowerd edge of a chromatogram instead of from the origin line as instructed. he obtains the following values for the measurements:
Dye spot - 12.8 cm
Solvent front - 19.8 cm
his origin line was drawn 2.5 cm from the lower edge. which of teh dyes could have caused the spot? (carmine yellow, visual purple, or skyy blue?)

if student c had followed the instructions for the preparation of the chromatograph, what would be the distance from teh bottom edge of teh chromatogram to the solvent front and to the dye spot in a properly prepared chromatograph developed for teh same period of time?

2007-01-04 12:13:34 · 1 answers · asked by Anonymous in Chemistry

2007-01-04 12:13:17 · 7 answers · asked by Anonymous in Mathematics

People spend so much time arguing about everything from politics to religion. Why can't we focus our collective energies and actually accomplish something worth while, that could actually unite us as a world?

2007-01-04 12:13:00 · 9 answers · asked by John 3 in Astronomy & Space

2007-01-04 12:12:41 · 4 answers · asked by Anonymous in Chemistry

How do you solve and gragh 5x-2y=10. And how do you find the x and y intercept?

2007-01-04 12:12:21 · 7 answers · asked by tiny 1 in Mathematics

18+m=-57

2007-01-04 12:11:17 · 9 answers · asked by Lynette B 1 in Mathematics

2007-01-04 12:11:08 · 10 answers · asked by wever07 1 in Mathematics

I have a science hw thing where i have to make the longest word i can out of all the element's chemical symbols in the periodic table. PLEASE LIST THE ELEMENTS THAT U USED!!

2007-01-04 12:11:08 · 3 answers · asked by softballchick 1 in Chemistry

2007-01-04 12:10:58 · 3 answers · asked by one14life11 1 in Physics

2007-01-04 12:10:29 · 9 answers · asked by loofahcat2 2 in Paranormal Phenomena

in a paper chromatogram using ethyl alcohol, a dye spot is measured to move 13.8 cm from the origin.
The solvent front for that spot is measured to have moved 20.3 cm from the origin.

A) What is the Rf value for the dye spot?

B) From an independent paper chromatograph usin alcohol, the Rf values for teh following dyes are as follows:

Carmine Yellow-.59

Visual Purple-.67

Skyy Blue-.85

What is the likely identity of the dye spot whose Rf is calculated in a?

2007-01-04 12:09:47 · 1 answers · asked by Anonymous in Chemistry

2007-01-04 12:07:59 · 3 answers · asked by ♥Happy Holidays♥ 1 in Physics

2007-01-04 12:07:39 · 7 answers · asked by Anonymous in Mathematics

which one?
256 degrees
14 degrees
166 degrees
76 degrees

i keep asking questions like this because i dont know what to to and i didn't even learn this i got to answers these for school i only had one day to study because i was absent

2007-01-04 12:06:56 · 4 answers · asked by Chris 1 in Mathematics

cesium has a half life of 33 years

2007-01-04 12:03:57 · 1 answers · asked by Jaci 1 in Mathematics

an addition table for a subset of real numbers is shown below. which number is the identity element?

EXPLAIN...watz an identity element..please explain thoroughly

+ 0 1 2 3
________
0 | 0 1 2 3
1 | 1 2 3 4
2 | 2 3 4 0
3 | 3 4 0 1

2007-01-04 12:03:43 · 3 answers · asked by Anonymous in Mathematics

A body moves such that its displacement from an origin O at time t seconds is x metres, where x = 4 sin 2t. How far does the body move in the first second?

The working I got from my textbook is:

When t = 0, x = 0
When t = 1, x = 4 sin 2
= 3.64
But when t = π/4, x = 4.
Thus the distance travelled in the first second is 4+ (4-3.64) = 4.36m.

My question is: since I'm asked to find the distance of the body in the first second, should I just sub t = 1 into the equation and leave it at that? Why do I have to also sub t = π/4 into the equation? I also don't understand the rest of the working (i.e. 4+ (4-3.64) = 4.36m)? Help! Thanks in advance!

2007-01-04 12:01:57 · 2 answers · asked by delye56 2 in Mathematics

can someone explain what happens in all the phases...in like smaller words...lol...plz make it simple...i dnt get the online stuff and the stuff in my book cuz i dnt understand half the words they use!! plz i knw there is alot of steps...(or i think there is) but i would greatly appreciate it!!!!!!!!!!!!!!!!!!!!!!!

2007-01-04 12:01:43 · 4 answers · asked by Anonymous in Biology

2007-01-04 12:01:27 · 8 answers · asked by Nobody 2 in Zoology

2007-01-04 12:00:04 · 3 answers · asked by t2k4life 1 in Other - Science

The length of a rectangle is 6cm more than twice the width. If the perimeter is 56 cm, find the dimensions of the rectangle.

2007-01-04 12:00:03 · 10 answers · asked by Anonymous in Mathematics

2
--x = 12.
3

(2/3x=12)

how to solve it...
and there's a question...

Why is x obviously greater than 12?

2007-01-04 11:59:31 · 3 answers · asked by Question box 1 in Mathematics

i need it before 8:00pm thursday

2007-01-04 11:59:07 · 14 answers · asked by Pamela M 1 in Mathematics

2007-01-04 11:56:01 · 18 answers · asked by loofahcat2 2 in Paranormal Phenomena

Carbon 14 dating assumes that the carbon dioxide on earth today has the same radioactive content as is did centuries ago. If this is true, the amount of carbon 14 absorbed by a tree that grew several centuries ago should be the same as the amount of carbon 14 absorbed by a tree growing today. A piece of ancient charcoal contains only 15% as much radioactive carbon as a piece of modern charcoal. How long ago was the tree burned to make charcoal? Assume the half-life of carbon 14 to be 5730 years.

2007-01-04 11:54:31 · 3 answers · asked by Jaci 1 in Mathematics