Science & Mathematics - 16 October 2007

i keep getting the same answer with this question, i am studying for a test online it shows the choices but the answer i get is not one! so will some one do it and see what answer u get ..i am using the star to show exponents

7[3*2-2(1+2)] / 7+5*2

2007-10-16 20:36:26 · 7 answers · asked by Anonymous in Mathematics

What is the Maclaurin series for cos(x) and what is the Maclaurin series for e^x?

2007-10-16 20:36:19 · 2 answers · asked by Jon G 4 in Mathematics

Well, I already know that Riemann proved that a conditionally convergent infinite series can be rearranged to converge to any real number as well as diverge to either positive or minus infinity. But specifically how is this done in an example? For example if I want the alternating harmonic (which "usually" converges to ln(2)) to converge to 5, how can I rearrange the terms?

In addition, does anyone know of any conditionally convergent series that are NOT alternating. It seems to me from the definition that it doesn't always have to be alternating to be conditionally convergent.

2007-10-16 20:06:31 · 1 answers · asked by The Prince 6 in Mathematics

2007-10-16 19:55:43 · 21 answers · asked by Anonymous in Weather

Cant work it out... Heres a site on the drug, in case you know it by another name/etc.

http://en.wikipedia.org/wiki/Timentin

thanks in advance for any help!

2007-10-16 19:52:37 · 3 answers · asked by Anonymous in Medicine

x(y^2) - 2y = 3

is there an online graphing calculator that can graph that thing? look at it closely. it's so annoying that i have to use implicit differentiation. but my point is, how do i graph this thing with out have to manual plug in points?

or is there a way that i can do this on my graphing calculator?

2007-10-16 19:51:27 · 1 answers · asked by Eyeshield 21 of S33k3r C0unc1l 2 in Mathematics

I understand that the formula is:

velocity = frequency x wavelength

But why does 69.9 cm become 0.699? Why do we divide it by 100?

2007-10-16 19:48:53 · 2 answers · asked by lovemeplease 2 in Physics

Wats the relation between the parameter "a" and "the distance between focus and directrix" if the two constructed parabolas superimpose on each other?

2007-10-16 19:40:41 · 1 answers · asked by Mahi 2 in Mathematics

2007-10-16 19:35:55 · 7 answers · asked by Raian Razal 3 in Physics

ok so i have this thing for ecology and i have to know which way do the hurricanes spin if its a male and which way they spin if its a female.
and also how do they know if its a male or female hurricane?
thanks

2007-10-16 19:34:14 · 4 answers · asked by Anonymous in Weather

A 1.7 kg body is initially moving northward at 15 m/s. Then a force of 20 N, toward the east, acts on it for a time of 4.5 s.

(a) At the end of that time, what is the body's final velocity?
Magnitude________m/s
Direction_________° north of east
(b) What is the change in momentum during that time?
__________kg*m/s

2007-10-16 19:33:28 · 3 answers · asked by Anonymous in Physics

example:El Nino or El Nina meaning boy/girl or other latin names.is that because spanish is becoming very well-known and accepted as the 2nd common language? is that discrimination against other languages, such as asian languages,etc or should meterologists/weather naming people alternate between different language names/terms and spice it up since the U.S. is very diverse (ex:Category 5 Hurricane = (italian)Mamma Mia! or (french)Le Danger!) or (chinese)Dai-lo*Big Boss*? or should they just all be in english since that is the universal language in the united states? what are your opinions? thanks.

2007-10-16 19:33:13 · 7 answers · asked by polly-pocket 5 in Weather

How different is “Destiny” from “Luck”? How they are related to “Effort”?

2007-10-16 19:29:06 · 8 answers · asked by Bhatta 2 in Paranormal Phenomena

UNDER NORMAL CURCUMSTANCES AN EXPLOSION WILL MOVE THE MATTER in all directions randomly. explosion will cause distruction. but in the reverse the explosion in the space caused the construction in the matter , the sun the moon the stars our home earth and the all living beings .

2007-10-16 19:24:17 · 10 answers · asked by jack 2 in Astronomy & Space

Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg terephthalic acid produces 41.98 mg CO2 and 6.45 mg H2O. If 0.242 mol of terephthalic acid has a mass of 40.2 g, determine the molecular formula for terphthalic acid.


SoI tried to figure out if 19.81mg = 41.98 mg CO2 and = 6.45 mg H2O then it's 2.119131752 times the acid for CO2 and 0.3255931348 times for H2O then 1 mol = 166.1157025g
then CO2 = 30% C and 70% O
and H2O = 11% H and 88% O
Then it's C9H6O18
But that's not correct can you help me?
What is the answer? and can you explain how you got it please.

2007-10-16 19:16:47 · 2 answers · asked by Anonymous in Chemistry

where is black hole located ??? in the middle of our galaxy? or somewhere in our universe???

2007-10-16 19:12:02 · 6 answers · asked by watani@sbcglobal.net 1 in Physics

How do scientists know that distant galaxies are made of matter and not antimatter?

Antimatter has identical properties as matter so it could form stars and planets too. Light emitted by antimatter stars is exactly the same as light from matter stars. The only thing that we receive from other galaxies is their light. So how can we know if distant galaxies are made up of matter or antimatter?

2007-10-16 19:10:04 · 8 answers · asked by jeffdanielk 4 in Astronomy & Space

If pangaea has been split for over 80 million years ands tigers have only existed for 2 million years then why are there tigers on the indonesian island of Sumatra if most tigers are continental dwellers.
How did they get out there?
Were they introduced or are they native?

2007-10-16 19:08:24 · 1 answers · asked by mallan 1 in Earth Sciences & Geology

Hey Guys! I desperately need help! My chemistry teacher wants me to make a temperature scale based on the boiling points and freezing points of ethyl alcohol. He wants 0 degrees to be the freezing point and 100 degrees to be the boiling point of ethyl alcohol. I have to put the freezing point of water and the boiling point of water on that scale. Can anyone help me please? The bp of ethyl alcohol is 78centigrade and fp is -115centigrade. Then i also have to make a formula to convert from celsius scale to the ethyl alcohol scale PLEASE HELP (T.T)

-HottieBlonde6969

2007-10-16 18:58:38 · 2 answers · asked by Anonymous in Chemistry

i mean by the big ban theory has been proved scientifically . So by the big ban theory we can say that in the first there was nothing so the hole universe came from nothing right .Its amazing that the whole of the universe came from nothing.

2007-10-16 18:53:27 · 10 answers · asked by Anonymous in Astronomy & Space

the humanity center

2007-10-16 18:45:45 · 8 answers · asked by 420 cancer 1 in Medicine

m=.03579 kg
v=355 m/s

What will the kinetic energy be in 18.49 seconds?

I know how to find the kinetic energy, but i just don't know how to factor in time.

2007-10-16 18:44:42 · 4 answers · asked by Anonymous in Physics

2007-10-16 18:42:49 · 2 answers · asked by Hector L 1 in Biology

I seem to recall learning somewhere that it's not electrically possible to measure the voltage across the secondary of a transformer. However the more I think about it the more I can't quite figure why that would be so, and I am really just curious as to weather it's true at all and if so why exactly it's not possible?

2007-10-16 18:42:24 · 6 answers · asked by Charles H 1 in Engineering

...Since almost all recorded information is done so electronically - computers, Intranet, etc. and no longer on paper/ink?

2007-10-16 18:40:28 · 2 answers · asked by piemuncherno1 3 in Other - Science

I want to tap into my powers and want tofind people with the support and need to find their powers as well. I believe we can help each other.

2007-10-16 18:30:54 · 4 answers · asked by Anonymous in Other - Alternative

2007-10-16 18:21:39 · 10 answers · asked by zain s 2 in Mathematics

2007-10-16 18:21:30 · 4 answers · asked by jackfooo 5 in Chemistry

2007-10-16 18:19:23 · 17 answers · asked by Noble M 1 in Astronomy & Space

I was asked to make this reaction acidic:
Cr2O7-2 + Zn ---> Cr+2 + Zn+2

and this is what I came up with:
Cr2O7-2 + Zn + 14H + 10e- ---> Cr+2 + Zn+2 + 7H2O + 2e-

is it right????? PLZ ITS URGENT

2007-10-16 18:19:04 · 4 answers · asked by Curious 1 in Chemistry