Science & Mathematics - 10 September 2007

Describe the difference in what is being communicated in the following symbols:
P4 and 4P\
Cl2 and Cl
Hg (l) and Hg (g)
H2O2 and H2 + O2
NaCl (l) and NaCl (aq)
Mg and Mg 2+

2007-09-10 11:39:38 · 1 answers · asked by Anonymous in Chemistry

We are supposed to make an astrolab and determine the angle of polaris. It has been so I can't read the angle so does anyone know? I don't know where to even look.
Thanks a ton!

2007-09-10 11:37:58 · 6 answers · asked by leap year girly 2 in Astronomy & Space

Determine whether the sequence converges or diverges. If it converges find the limit.

1) (3 + 5n^2)/(n + n^2)

2) an= n/(1+ radical n)

3) an= (-1)^(n-1)n/(n^2 + 1)

4) {n^2e^-n}

Please either explain how to do it or show me the steps so i know..thanks! :)

2007-09-10 11:37:49 · 1 answers · asked by Anonymous in Mathematics

help plz!!!!!!

2007-09-10 11:36:35 · 4 answers · asked by shima 1 in Chemistry

2x^2+3x-1, f(x+h)-f(x)/h, h is not = to zero

2007-09-10 11:35:49 · 1 answers · asked by ladylight 1 in Mathematics

is it going to be really disgusting??
will it be bloody???
i've never disected anything before and i kinda get grossed out easily...

2007-09-10 11:35:46 · 11 answers · asked by ♥Bella Ragazza♥ 2 in Other - Alternative

what do i do in this situation?
7x^2-71x+10
so 7*10=70
-70+-1=-71

7x^2-70x-x+10
7x(x-10)-(x+10)


rut rooooowww!

i don't remember what to do!

thanks in advance!

2007-09-10 11:33:03 · 1 answers · asked by alexie. 4 in Mathematics

thanks

2007-09-10 11:30:39 · 3 answers · asked by Anonymous in Astronomy & Space

Hi does anyone know for sure which would be the most visable beam on a green laser
532nm 240mw or 532nm 8mw
I was working on the angle that the higher the Mw the more powerful the beam.....is this correct

2007-09-10 11:27:47 · 7 answers · asked by Rozzaxw1 2 in Astronomy & Space

What is an appropriate domain for the local linear approximation of the square root of x ((radical)(x))? And why? Give explanation please

2007-09-10 11:20:30 · 2 answers · asked by iamsuperpeace 2 in Mathematics

First, this community rocks. I only wish I could carry a conversation with some of the answerers, however this format is limited by (bad) design.

K, my question :

As I understand it. The universe is expanding. The further out we look, the faster the galaxies seem to be receding from us. There is a simple ratio involved : further out = faster speed of recession.There is also distance beyond which we can not see. My questions involves this distance.

Have any objects been seen, and can not be seen any more, because they are now beyond this distance?

Wouldnt objects beyond this distance be going (relative to us) faster than C?

If above is yes (seems likely to me) then an interesting side effect would be that we are able to get information about something going faster than light away from us. (gravitational pull of a galaxy near the edge, which could tell us how massive a nearby galaxy past the edge is)

2007-09-10 11:20:23 · 7 answers · asked by Anonymous in Astronomy & Space

what are the correct names for the chemical compounds

Cr(OH)3

K2CrO4

KMnO4

Sr(CN)2

Ca(NO3)2

2007-09-10 11:18:09 · 3 answers · asked by yahooanswers23 1 in Chemistry

2007-09-10 11:07:54 · 2 answers · asked by kingcool1 d 1 in Biology

what is the final answer when you factor it all out

2007-09-10 11:07:24 · 3 answers · asked by Cayden 1 in Mathematics

An arc second is ___________ (give the fraction) of an arc minute.

2007-09-10 11:06:04 · 3 answers · asked by olgybear27 1 in Astronomy & Space

i am supposed to draw my own island and one of the things i have to draw on it is a rocky coast but i dont no what to draw! help

2007-09-10 11:05:17 · 1 answers · asked by asker 2 in Earth Sciences & Geology

A boy sledding down a hill accelerates at 1.20 m/s2. If he started from rest, in what distance would he reach a speed of 9.50 m/s?

please show equation used and how you got the answer

2007-09-10 11:00:52 · 3 answers · asked by Anonymous in Physics

Space

2007-09-10 10:59:32 · 5 answers · asked by Jimena 2 in Astronomy & Space

i dont need the answer, i just need to know if its X=0

if its not X=0 please show ur work when giving the answer

it will be very appreciated

2007-09-10 10:56:59 · 7 answers · asked by Anonymous in Mathematics

http://img260.imageshack.us/img260/9347/13776817gi8.jpg
That links shows the picture the question is describing:

2007-09-10 10:56:39 · 3 answers · asked by Anonymous in Mathematics

2007-09-10 10:54:49 · 4 answers · asked by Anonymous in Astronomy & Space

thank you

2007-09-10 10:53:33 · 3 answers · asked by Diana G 1 in Astronomy & Space

ok here we go:

5x+2y=7

explain to me how u t=do this cus i dont get this eithr

2007-09-10 10:53:28 · 7 answers · asked by blah! 3 in Mathematics

2007-09-10 10:53:21 · 7 answers · asked by Anonymous in Other - Science

A 75kg person stands in an elevator. what force does the floor exert on the person when the elevator
(1) starts moving upward with an acceleration of 1.5 m/sec^2?
(2) moves upward with a constant speed of 2.0 m/sec?
(3) starts accelerating downward at 1.5 m/sec^2?
(b) If the person were standing on a bathroom (spring) scale during the ride, what readings would the scale have under conditions (1), (2), and (3) above.
(c) It is sometimes said that the "apparent weight" changes when the elevator acclerates. what could this mean? Does the weight really change?

2007-09-10 10:53:11 · 1 answers · asked by DJ Ott 1 in Physics

Find the are of this figure!?!? its 3in. 2in. 7in. 2in. 10in. and 4in.!!!!!!!!THANKS!!!!!!!

2007-09-10 10:52:09 · 10 answers · asked by Claire P 1 in Mathematics

2007-09-10 10:52:00 · 1 answers · asked by Anonymous in Chemistry

Of course an element is made of many atoms, but be more descriptive.

2007-09-10 10:50:31 · 6 answers · asked by Average Joes 4 in Chemistry

I don't know how to do these problems without guessing and checking. Will someone please help explain the reasoning to me? Thanks.

Find the value of "r" that makes each sentence true.

2^(r+5) = 2^(2r-1)
I know that the answer to this problem is r=6 but how??

also...

m^r / m^15 = (m^3)^r+2
(m^r) is in the numerator and (m^15) is in the denominator. also on the right side of the equation the 3,r, and 2 are all exponents.
For this problem I got that the answer was -8.5 and it works but the book got -10.5 (-21/2) and i couldn't even get this to equal both sides of the equation?? suggestions??

2007-09-10 10:49:38 · 7 answers · asked by Razzle Dazzle 3 in Mathematics

Wow. The class barely started and I'm already failing. Our first test was on stuff like Algebra 2 and Pre-Cal. I failed the test so badly that it's not even funny. Out of the statistics, about 30% of our class failed, 32% got A's, and the other remaining students got B's-D's. The test was a nightmare for me.

However, on the other hand, we are covering limits right now and I find the chapter pretty easy. >_>

I'm having mixed thoughts about this class now. Jumping from an extremely hard test to an easy chapter? Does Cal AB material stay relatively easy like this or do they become sharply harder later?

2007-09-10 10:49:31 · 6 answers · asked by Anonymous in Mathematics