Science & Mathematics - 1 November 2006

2006-11-01 07:18:01 · 3 answers · asked by Anonymous in Earth Sciences & Geology

25cm3 of a solution of 0.2M of KOH reacts with 30cm3 of a solution of nitric acid. (KOH + HNO3 ---> KNO3+ H20)
My final answer was 4.1 mols dm3 of nitric acid/KNO3 is it correct?? :s plz help

2006-11-01 07:16:25 · 1 answers · asked by Joyce 4 in Chemistry

Hi,

I am an undergraduate student doing a business degree. I have a piece of tutorial work on sampling at a lower level than I am sure most of you are used to.

I have a question, I have done an NPV calculation using excel with costs and profits (a0, a1, etc.) each of uniform distribution. When the NPV's are analysed they show something near to a normal distribution on the histogram. Why does combing several uniform distributions in a calculation produce a normal distribution?

Thanks in advance for any help you provide.

2006-11-01 07:15:28 · 4 answers · asked by joemoran7 2 in Mathematics

2006-11-01 07:15:24 · 6 answers · asked by Anonymous in Astronomy & Space

I am using charles's law and just need to have it told to me in laymens terms.
I think my head has stoped workng :)
Thanks for the help, I just need help with the steps I can find the answer if I have all the steps.

2006-11-01 07:15:06 · 3 answers · asked by Heavy Metal 3 in Chemistry

2006-11-01 07:11:54 · 9 answers · asked by 12honorsphysics101 1 in Physics

1.Find the perpendicular bisector of the segment joining the points A(7,3) and B(-1,4)
2. How many diagonals are there in a 10 sided polygons?
*** easy way to get a best answer, correct answer and explanation. come on, you can do it.

2006-11-01 07:10:23 · 2 answers · asked by Anonymous in Mathematics

Do you think we will have "warp" capability like Star Trek?

2006-11-01 07:09:37 · 13 answers · asked by Siu02rk 3 in Physics

A 19.6 kg child descends a slide 3.80 m high and reaches the bottom with a speed of 2.52 m/s. How much thermal energy due to friction was generated in this process?

What formulas are used for this? How would you solve this problem?

2006-11-01 07:07:29 · 1 answers · asked by Isabel G 1 in Physics

2006-11-01 07:07:17 · 10 answers · asked by Chris J 1 in Mathematics

if I put 1-hexanol (with an OH group) in water, I think it will dissolve because of hydrogen bonds. But, if I put 1-hexanol in hexane...is there a probability that it can dissolve?

2006-11-01 07:05:44 · 2 answers · asked by ABC 4 in Chemistry

2006-11-01 07:05:12 · 6 answers · asked by Sonja - 1 in Mathematics

2006-11-01 07:04:46 · 4 answers · asked by Sonja - 1 in Mathematics

Basic maths:
seems to me to have have one rule for some and others for calculus.
I am shore that you transfer X onto the other side by dividing, or multiplying (depending) yet here in calc. they subtract X, does this make logical sense, or do people change the rules, or does things like this work out either way?
Thanks.

2006-11-01 07:03:12 · 3 answers · asked by louise c 1 in Mathematics

solve the given pairs of equations simultaneously.
a) 4x+4y= -12 ; -2x+3y= 14
b) 3x+2y=5 ; 2x-3y=3

2006-11-01 07:02:23 · 3 answers · asked by Anonymous in Mathematics

What is a distinguishing characteristic of chordates?

2006-11-01 07:00:49 · 3 answers · asked by chris76ers1 3 in Botany

My grades where: A's - biology, chemistry, history, english language, english literature, child development. B's - Pyshics, Art, Maths. C's - spanish.

I am willing to do as much work experience as possilbe and have already done a weeks work experience in arrowe park hospital on the childrens ward, and have also done voluntary work involving helping with younger children in: peer mentoring, lesson support, helping wiv primary school students, helping out in a nurseryf or 3 months etc

I am studying for As level Biology, Chemistry, Psychology and Food and Nutrtion. For A level i am planning on taking Biology, Chemistry, Psychology

2006-11-01 07:00:30 · 6 answers · asked by Claire F 1 in Medicine

2006-11-01 07:00:21 · 2 answers · asked by Lizzy 1 in Chemistry

Al I know is that the answer is not calcium oxide.

I think that is the same reason the Statue of Liberty is green, her copper rusted and turned green. What is the name of that proccess?

2006-11-01 07:00:03 · 9 answers · asked by pgw410 3 in Chemistry

2006-11-01 06:59:18 · 9 answers · asked by matrix_testing_ans 2 in Astronomy & Space

Each point in the plane can be associated with an ordered pair of numbers called the _________ of the point.

2006-11-01 06:59:01 · 1 answers · asked by Anonymous in Mathematics

2006-11-01 06:58:34 · 11 answers · asked by jimbob 1 in Biology

Sirius is the brightest star in the night-time sky. It is a binary star system consisting of a blue-white main dwarf star and a faint white dwarf companion, known respectively as Sirius A and Sirius B. It is impossible to see Sirius B except with very powerful telescopes and it was not discovered until the 1840's. There is a possibility, however, that the Dogon people of Mali in Africa had knowledge of Sirius B prior to this time. They have incorporated this small companion star into their mythology and rituals. There is, of course, controversy over whether the Dogon actually had prior knowledge of Sirius B before its discovery by western astronomers or whether that knowledge came from cultural contamination with Europeans.

The question here is:

Do you believe Dogon knowledge of Sirius B might actually antedate its discovery by astronomers?

and

2006-11-01 06:58:26 · 6 answers · asked by Seeker 4 in Astronomy & Space

Does it give off excessive amounts of radiation? (would you need some sort of protection) How does it work? (basic explanation)

2006-11-01 06:58:09 · 5 answers · asked by Anonymous in Other - Science

1/8 S8(s) + H2(g) H2S(g) Hrxn = -20.2 kJ

(c) What is Hrxn when 3.4 mol S8 reacts?
(d) What is Hrxn when 20.0 g S8 reacts?

2006-11-01 06:57:45 · 1 answers · asked by meggers 3 in Chemistry

With some of the great pictures that the Hubble telescope has got from the Universe I was wondering why is it so beautiful? There is so much color and contrasts it does make the mind wonder.

http://www.nasa.gov

2006-11-01 06:56:57 · 15 answers · asked by Siu02rk 3 in Astronomy & Space

for the sake of specifics ...let's say a 32 caliber.

2006-11-01 06:56:25 · 3 answers · asked by Anonymous in Physics

I want to be a heart surgeon. I have been looking, but I do not see anything along the lines of surgical, heart, or even cancer medicine. I need your help. Anyone of those three can help me out. Thank you.

2006-11-01 06:55:27 · 4 answers · asked by Lizzie03 2 in Medicine

How many pounds of candy selling for $1.75 a pound should be added to four pounds of candy selling for $3.99 a pound to create a blend, which will sell for $3.30 a pound?

** I got the answer but I'm not definite if it is right. If you solve this problem, please sbow me the equation and all the work... Thanks in advance.

2006-11-01 06:54:21 · 5 answers · asked by coolpowwow80 3 in Mathematics

2006-11-01 06:51:24 · 2 answers · asked by Special K 1 in Medicine