Science & Mathematics - 5 November 2007

1
_______
3 - 2^(1/2)

Rationalize the denominator (sorry i dont know how to type square roots on the computer)...

The book's answer is :

1+2^(1/2).
________
7
I dont understand how they got 7 for the denominator. I understand how the numerator came about. I got -6 for the denominator.... please help..

2007-11-05 09:06:08 · 3 answers · asked by gummi 1 in Mathematics

thxs

2007-11-05 09:05:37 · 11 answers · asked by ivan_c 2 in Mathematics

Just a day ago (11/4), we should have moved our clocks back one hour. When we go into spring/summer, we move it back up one hour.

Which is longer, the number of days with one hour back or the number of days with one hour ahead?

2007-11-05 09:05:12 · 2 answers · asked by Jason 4 in Other - Science

is it the religious views or what...

2007-11-05 09:04:49 · 4 answers · asked by Breed 2 in Biology

2007-11-05 09:04:06 · 3 answers · asked by Adam P 1 in Mathematics

2007-11-05 09:01:25 · 3 answers · asked by Adam P 1 in Mathematics

use a linear approximation to estimate the value of (41/10)^1/2

2007-11-05 09:01:22 · 1 answers · asked by orlandosgrl89 1 in Mathematics

Is it the nucleus ??

2007-11-05 09:00:56 · 6 answers · asked by Bowchickawowwoww 3 in Biology

A) fontanels
B) ligaments
C) keratinocytes
D) tendons
E) sarcomeres

2007-11-05 08:59:55 · 4 answers · asked by Anonymous in Biology

What changes in the oxidation number of oxygen must occur if it is to be an oxidizing agent? Explain.. thanks

2007-11-05 08:56:29 · 2 answers · asked by maybe714 1 in Chemistry

In his explanation of the threshold frequency in the photoelectric effect, Einstein reasoned that the absorbed photon must have the minimum energy required to dislodge an electron from the metal surface. This energy is called the work function of that metal. What is the longest wavelength of radiation (in nm) that could cause the photoelectric effect in each of the following metals?
(a) Potassium, work function = 3.68 10-19 J
(b) Tungsten, work function = 7.16 10-19 J
(c) Silver, work function = 7.59 10-19 J

2007-11-05 08:55:32 · 2 answers · asked by Audre 1 in Chemistry

I am just curious if all the elements in the periodic table can be combined into 1 object or creation or whatever you want to call it through whatever methods are available with today's scientific equipment. If so... any idea what that creation would be?

2007-11-05 08:55:20 · 2 answers · asked by nc_dixieman 2 in Chemistry

its a project i need help with

2007-11-05 08:50:57 · 3 answers · asked by TJ - the man with many questions 1 in Earth Sciences & Geology

Which do you think is a better magazine and why???

2007-11-05 08:49:20 · 2 answers · asked by Anonymous in Other - Science

How do I determine the oxidation states for atoms that contain more than two elements? For example:

-Na4Fe(OH)6
-XeOF4
-C6H12O6

I don't know how to figure out the individual oxidation states. Can anyone help me? Please?

2007-11-05 08:48:59 · 4 answers · asked by Anonymous in Chemistry

if not why?

2007-11-05 08:48:50 · 11 answers · asked by alongfortheride 2 in Astronomy & Space

find a ten digit number containing each digit once, so the number formed by the first n digitd is divisible by n for each value of n between one and 10.

2007-11-05 08:44:33 · 2 answers · asked by Jason N 2 in Mathematics

I Need Help For A Maths Prelim .. Aaagghh

Can SomeOne Get Back To Me Soon Please =)

Thanks.Ox

2007-11-05 08:42:48 · 8 answers · asked by EmmaBabey.Ox 1 in Mathematics

change 4 2/3 to an improper fraction worth best awnser for the right anwser

2007-11-05 08:42:33 · 14 answers · asked by jcblackgamer 2 in Mathematics

I was thinking of being stuffed with cotton when I die.

2007-11-05 08:42:04 · 5 answers · asked by Anonymous in Other - Science

2007-11-05 08:37:39 · 3 answers · asked by JEROME B 1 in Engineering

Ok well, we now in math are dividing decimals and they really confuse me. One of the problems is.. Write the smallest power of 10 that you would multiply by to make the number a whole number. The numbers they give u are 7. 9.3, 8. 0.12, 9. 3.05, and 10. 12.001 Help!:)

2007-11-05 08:37:39 · 2 answers · asked by peyton6696 1 in Mathematics

Tangent to both axes, radius 8 and center lies quadrant IV...
The answer is (x-8)^2 + (y +8)^2 = 64

I just dunno how to get this asnwer so could somone explain or show their work...thanks.

2007-11-05 08:37:08 · 2 answers · asked by Green C 1 in Mathematics

Since this is a highly scientific poll, you can only answer one of the following.
Have you ever seen or experienced any of the following:

1. Chupacabras
2a. Alien Encounter - (nice aliens, example - didn't harm you, took you for a ride in his spaceship)
2b. Alien Encounter - (mean aliens, example - amputated a limb, performed bodily cavity probes).
3. Big Foot
4. Other weird things.

Thanks for your time, and for helping me with my research.

2007-11-05 08:35:47 · 7 answers · asked by Anonymous in Other - Science

Ok, be serious, because I sure am! :]

Has anyone else ever known when a ghost was in their presence? Like do you...
1) Get cold when it's near you?
2) Hear a white noise?
3) Feel its presence?
4) Just have that feeling that you are not alone?
5) Get scared sometimes, depending on the ghost?

I know a select few people that this happens to I just wanted to know other people's expierences. Share any stories if you want. :]

2007-11-05 08:34:14 · 18 answers · asked by Anonymous in Paranormal Phenomena

I found this pill and would like to know what it is. It is round, orange. On one side it says PLIVA, and on the other side it says 563. Please help!THNX

2007-11-05 08:32:14 · 22 answers · asked by breeleighmidge 2 in Medicine

Find DH for the reaction in kJ/g.

2 C2H6(g) + 7 O2(g) ® 4 CO2(g) + 6 H2O (l)

is it -51.8,-1295,-1550, -1667, -3110

2007-11-05 08:28:37 · 1 answers · asked by Cassie G 1 in Chemistry

2007-11-05 08:24:56 · 9 answers · asked by hanner 2 in Geography

Use the Rydberg equation to calculate the wavelength (in Å) of the photon absorbed when a hydrogen atom undergoes a transition from n = 1 to n = 3.
Å

2007-11-05 08:23:28 · 1 answers · asked by Anonymous in Chemistry

Is it possible that one identified as intersex has only one of the two genders' genital but is endowed with both male and female hormones?

I mean, the one that has ONLY hormonal disruption, and NOT the genetic disruption

And is it clearly distingushable from transsexual?

2007-11-05 08:20:46 · 8 answers · asked by Anonymous in Biology