Science & Mathematics - 15 October 2007

Given a circle, and two random lines that cut through it, what is the probability that the two lines intersect?

2007-10-15 07:52:48 · 6 answers · asked by rahidz2003 6 in Mathematics

Use reference angles to find the exact value of each expression.

Sin (-17TT/3)

2007-10-15 07:48:15 · 1 answers · asked by Anonymous in Mathematics

We are doing a project, and it's aimed for a community in Mali where they have a 10 month dry season. They have a swamp where they can extract water from. So we are looking to design a water pump that would feed the water into the tank. Does anyone know where could get more information on these types of water pumps, or has information on them?

Thanks

2007-10-15 07:47:44 · 2 answers · asked by Anonymous in Engineering

a site name would be helpful.

Thanks!!!!!!! :-)

I couldn't figure out what category to put.

2007-10-15 07:46:54 · 5 answers · asked by 9 Toes 4 in Other - Science

Given a circle with an inscribed equilateral triangle with each side of the triangle having a measurement of 18 cm. What is the probability of selecting a point at random inside the triangle, assuming that the point cannot lie outside the circular region. Leave your answer in exact form. To receive full credit, please show your work.

2007-10-15 07:45:38 · 3 answers · asked by Cakes L 1 in Mathematics

It is 7.43 pm for me (UK)

2007-10-15 07:44:29 · 12 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-15 07:31:12 · 16 answers · asked by Monica C 1 in Paranormal Phenomena

2007-10-15 07:27:20 · 4 answers · asked by spencer 2 in Physics

2007-10-15 07:25:37 · 3 answers · asked by d a 1 in Mathematics

I saw a show about the bermuda triangle as being a possible worm hole to the dragons triangle in Japan, I also saw a show that it was an ancient teleport station for traveling to different planets, during the time of Alantis! Anyone believe in this? I would like some opinions on this for a report in school, open to all beliefs, but please spare me from smart *** responses, these are just thoughts thanks.

2007-10-15 07:24:41 · 24 answers · asked by Anonymous in Astronomy & Space

A diprotic acid, H2A, has the following constants:
Ka1 = 0.0011
Ka2 = 0.0000025
In order to make a solution of pH 5.8 what is the pKa of the acid component?

2007-10-15 07:19:47 · 1 answers · asked by Tiffany 4 in Chemistry

2007-10-15 07:18:37 · 17 answers · asked by Anonymous in Astronomy & Space

......and told him there was a hurricane on the way?

2007-10-15 07:13:21 · 2 answers · asked by Keith D 1 in Weather

i need to finish a project thats due tomorrow!!!!!!!!!!!!!!!!!!

2007-10-15 07:11:33 · 2 answers · asked by quade b 1 in Zoology

a) rotates slowly
b) has an average density that is lower that the density of the crust
c) has a magnetic field
d) has a surface that is 75% water
e) all of the above

2007-10-15 07:09:13 · 5 answers · asked by Paul S 1 in Astronomy & Space

You are given unmarked straightedge, a comapass, and a sheet of paper with drawings.
http://i20.tinypic.com/25u7bjo.jpg

Now the quiz (please, pay attention):
** ** ** **
The curves in the graph accurately depict functions sin(x), cos(x), and ln(x). Which one is cos(x)?
1)
2)
3)
** ** ** **
What is area of right angle triangle ABC:
1) AB + BC
2) 1/2 AB x BC
3) AB x BC x CA
** ** ** **
Can you trisect angle DEF?
1) Yes
2) No, imposssible
** ** ** **
Can you double the volume of cube of edge PQ?
1) Yes
2) No, imposssible
** ** ** **
Can you qudrature circle s cetered at point O?
1) Yes
2) No, imposssible

2007-10-15 07:08:14 · 3 answers · asked by Alexander 6 in Mathematics

1. Find the equations of the 2 tangents to the ellipse x^2+4y^2=8 which are parallel to the line x+2y=6

2. Water is poured into an inverted conical container of base radius 5m and height 15m at a rate of 12m^3 min^-1. Calculate rate at which the water level is rising when radius of the water surface is 2m.

2007-10-15 07:08:14 · 2 answers · asked by Angel L 1 in Mathematics

2007-10-15 07:07:06 · 8 answers · asked by jj 1 in Geography

I am not a mathematician but have an interest in maths which doesn't actually go as far as actually doing calculations! I discovered this "fact" by playing with a calculator. I was unable to work out how to differentiate the function which is what you need to do no doubt to show what its maximum is.Can anyone give me some insight as to why this fact is a fact? The one who gets the 10 points will have to explain it in a very simple clear way suitable for someone whose knowledge of analysis is very elementary indeed.

2007-10-15 07:06:29 · 2 answers · asked by David J 2 in Mathematics

7 • 15 = 7(10 + 5) = ____ + _____ = _____


It's supposed to be simplified.. If you ask me, it's just making it harder.

2007-10-15 07:03:29 · 15 answers · asked by TheSara~ 2 in Mathematics

2007-10-15 06:57:01 · 3 answers · asked by Anonymous in Engineering

Approximate the sum of the series correct to four decimal places.
E,n=1, ((-1/8)^n)*n

2007-10-15 06:56:25 · 1 answers · asked by sugardaddy8815 1 in Mathematics

i have tried all sort of astonishing facts such as magic,alchemy etc and they all worked pretty well.atlast i want try this also.can anyone help me about it.

2007-10-15 06:54:51 · 4 answers · asked by vicky s 1 in Medicine

http://i2.photobucket.com/albums/y48/xxkrystinaxx9/asd.jpg

Here is the picture because i dont know how to write that out on the computer, hehe =)

-Thanks

2007-10-15 06:53:12 · 3 answers · asked by Anonymous in Mathematics

Had a quick question for a physics density problem.

Pure copper penny mass = 3.083 g
Copper-clad Zinc penny mass= 2.517g
Total Volume of each penny is the same.
Density of copper is 8.960 g/cm^3
Density of zinc is 7.133 g/cm^3

What fraction of the volume of the new penny is occupied by zinc?

I'm a bit lost on this problem...could you possibly show your work. Thanks much!

2007-10-15 06:46:55 · 3 answers · asked by cjoak 1 in Physics

I find it hard to believe that there isn't a scientific explanation for them, and I for one would like to know what it is I have therefore set up a little website if anyone would care to assist me in finding the answer.. if not please leave a reply here.

www.thebigones.co.uk

2007-10-15 06:43:55 · 21 answers · asked by thebigones2007 1 in Parapsychology

?

2007-10-15 06:41:31 · 3 answers · asked by v19 2 in Mathematics

It is easy to see how critical thinking applies to sociology, political science, literature, etc, because these fields allow for diversity of opinion. Math on the other hand is not really based on opinion.

Does critical thinking apply to mathematics, and if so how?

This is an open ended question, so feel free to elaborate.

2007-10-15 06:40:30 · 4 answers · asked by Dr D 7 in Mathematics

I am not sure I understand the whole EVP thing. Can it only be something you didn't hear the first time to count as an evp? I received a message on my phone from my grandfather yesterday, who died recently. Does that count as an evp?

2007-10-15 06:39:57 · 13 answers · asked by Anonymous in Paranormal Phenomena

Hubble space telscpe is smaller than Lrgst earth bsed telscpe, yet rslvng power is better.Why is that

2007-10-15 06:38:18 · 9 answers · asked by Paul S 1 in Astronomy & Space