Science & Mathematics - 25 October 2007

2007-10-25 20:32:14 · 14 answers · asked by elizabeth 3 in Mathematics

i can't do math other basic to save my life and end of semester is almost over and i need some help.

2007-10-25 20:30:17 · 10 answers · asked by elizabeth 3 in Mathematics

If there are twenty-five people in a room and each person shakes the hand of every person in the room once, how many handshakes will there be (do not count)?

Please help!

2007-10-25 20:29:12 · 8 answers · asked by vindictive_voice 3 in Mathematics

2007-10-25 20:25:44 · 2 answers · asked by Anonymous in Mathematics

When one year to the day past the 9/11 attacks, I was looking into the sky and noticed the shape of the moon. It was exactly the same shape of the moon that's on at least one of the flags of the Middle East. Maybe I'm being pretentious here, but I wonder if anyone else noticed that? Every culture ties into astrology in some way or another/degree of depth; in this case possibly knowing what moon would be up that night, one year before hand. I'm NOT pointing fingers because I can't, but isn't this an interesting unsung coincidence?

2007-10-25 20:22:38 · 4 answers · asked by Big B 3 in Astronomy & Space

a semipermeable membrane separates a 4%(m/) NaCl solution from a 2% (m/m) NaCl solution. INitially, the two solution levels are the same, but over time the levels become different.
a. which solution level will riseand which will drop?
b. which solution becomes more concentrated
c. in which direction, if any, is there a net flow of solvent
d. in which direction, if any, is there a net flow of solute

please show your workkkk

2007-10-25 20:19:04 · 1 answers · asked by bubbles7070 2 in Chemistry

2007-10-25 20:10:38 · 14 answers · asked by BURNMA 2 in Medicine

How do go about solving 10^0.20 or say 5^0.30

2007-10-25 20:09:54 · 5 answers · asked by Baiju J 1 in Mathematics

2007-10-25 20:07:50 · 6 answers · asked by LADY WITH AN ATTITUDE 6 in Mathematics

Elevations on google earth at any point on sea shore level (above or below equator etc) or somewhere on the middle of sea where the curvature of the earth changes is zero (same). If zero elevation is the correct elevation at all points along the sea shores then can I say earth is FLAT?

Please check the elevations along the seashores on google earth before answer to this question. Thx...

2007-10-25 19:58:06 · 10 answers · asked by ? 3 in Astronomy & Space

f(x)=t^4-5t

i don't think the h->0 approach will work seeing as how expanding (a+h)^4 is really hard, and i think it gets worse even after you factor.

do i use the x->a method? if so how do i go about this?

2007-10-25 19:55:32 · 6 answers · asked by Brews 2 in Mathematics

A fifth degree equation could have

A) 2 distinct real roots each with a multiplicity of 2.
B) 3 distinct real roots each with a multiplicity of 2.
C) 3 real roots and 1 imaginary root.
D) Exactly one real root with a multiplicity of 3.

2007-10-25 19:50:03 · 1 answers · asked by Anonymous in Mathematics

how to prove that COS ²X - 2 COS X -2 = 0 ?

2007-10-25 19:48:21 · 4 answers · asked by Gary 1 in Mathematics

2007-10-25 19:47:09 · 5 answers · asked by mmmsquare 2 in Medicine

2007-10-25 19:35:39 · 10 answers · asked by ez f 1 in Astronomy & Space

According to the universal law of gravitation, every object exerts a force on every other object in the universe. So if I move my hand, will the effect of that be felt in Alpha Centuari immediatly, or in 4 years time? If yes, would it be theoretically possible to devise meganisms for sending messages that move faster than light?

2007-10-25 19:33:21 · 7 answers · asked by kwaaikat 5 in Physics

I'd like to see examples...

2007-10-25 19:28:18 · 1 answers · asked by swami242 3 in Astronomy & Space

I don't know why most of people don't want to admit that Mecca is the center of the world .. given that it is already proven by scientist all around the world...and the thing is that it already stated in the Coran... is it because it has something to do with islam?

2007-10-25 19:17:52 · 10 answers · asked by PilotN1 3 in Geography

2007-10-25 19:15:05 · 2 answers · asked by dfgsdsg 1 in Biology

What else could there be,besides what we percieve?

2007-10-25 19:13:51 · 11 answers · asked by Life goes on... 6 in Astronomy & Space

But... I'm sure its not sclera...

2007-10-25 19:09:27 · 3 answers · asked by Ammu 2 in Medicine

http://s40.photobucket.com/albums/e215/xxs3xp1stolxx/Algebra%20II/?action=view¤t=Picture3.png

2007-10-25 19:08:46 · 2 answers · asked by Anonymous in Mathematics

2007-10-25 19:04:32 · 2 answers · asked by ♥Strength and Perseverance♥ 5 in Other - Science

If x^2 - 13x + 42 = (x + A)(x + B), then A + B =

-42
-1
13
42
none of these

2007-10-25 18:54:46 · 11 answers · asked by Anonymous in Mathematics

How many grams of NaBr were added....?

At 37.0C, the vapor pressure of 355 g of water was reduced from 6.20×10−2 atm to 5.20×10−2atm by the addition of NaBr.

This is what I did:
Del P = x Po
.062 - .052 = x (.062)
x= .001 / .062
x=0.1612

Now # of moles in water:
355/18.02 = 19.7mol

Now use mole fraction:
xH2O = mol h2o / mol h20 + mol NaBr
mol NaBr = mol h20 / xH20 (xH20)
mol Nabr = 1 / .16
mol = 6.25

Convert moles to grams
6.25 x 103 = 643.75grams

IS this right?
Thanks!

2007-10-25 18:48:45 · 2 answers · asked by Anonymous in Chemistry

what is the dark thing on the photo of the sun.
http://en.wikipedia.org/wiki/Image:Sun920607.jpg

2007-10-25 18:45:11 · 4 answers · asked by Anonymous in Astronomy & Space

pls share
ty

2007-10-25 18:42:37 · 8 answers · asked by Yvonne 4 in Parapsychology

pls advise
[um the question here is for BELIEVERS or someone who's actually seen one, or a paranormal investigator, TY!]

2007-10-25 18:41:50 · 10 answers · asked by Yvonne 4 in Paranormal Phenomena

2007-10-25 18:41:22 · 6 answers · asked by Anonymous in Mathematics

if your one of them, why do you do this?
it's silly

2007-10-25 18:36:50 · 9 answers · asked by Yvonne 4 in Paranormal Phenomena