Science & Mathematics - 14 December 2006

How would you solve sqrt(4i + 3) in the form a + bi? I haven't been exposed enough to complex numbers to know how to solve it.

2006-12-14 23:58:46 · 8 answers · asked by Puggy 7 in Mathematics

2006-12-14 23:58:13 · 5 answers · asked by Anonymous in Weather

Light of wavelength of 2.1 * 10^-7 m is incident on a metal whose work function is 2.8 * 10^-19 J.
What is the maximum kinetic energy of the electrons released from the metal ?
What is their maximum speed ?

2006-12-14 23:58:02 · 3 answers · asked by cute_turk1989 1 in Physics

2006-12-14 23:56:44 · 3 answers · asked by Anonymous in Weather

2006-12-14 23:55:30 · 11 answers · asked by Anonymous in Weather

2006-12-14 23:55:06 · 2 answers · asked by Anonymous in Engineering

Let's say I have a sequence of numbers simpilar to this: 1, 2, 5, 3, 34, 5, 7, 11, 22, 45, 56. How can I figure out what would be the next number? I guess I will firstly have to figure out some general idea about (or a general pattern or a principle of) the nature of the development hidden behind these numbers, and then, based on that principle, figure out the next possible number. But how?

2006-12-14 23:54:34 · 4 answers · asked by dolempap 2 in Mathematics

2006-12-14 23:54:17 · 6 answers · asked by James 5 in Astronomy & Space

2006-12-14 23:52:58 · 5 answers · asked by James 5 in Astronomy & Space

Ahhh I'm dying here:

The equilibrium constant for the reaction
2Fe3+(aq) + Hg22+(aq) <=> 2Fe2+(aq) + 2Hg2+(aq)
is Kc = 9.1×10-6 at 25.0°C.
What is DGo at this temperature?

Thanks so much :)

2006-12-14 23:47:21 · 1 answers · asked by thesekeys 3 in Chemistry

2006-12-14 23:46:29 · 27 answers · asked by azman5998 3 in Weather

For the gaseous reaction of xenon and fluorine to form xenon hexaflouride:
Calculate DSo at 298 K (DH = -402.0 kJ/mol and DGo = -280.0 kJ/mol).
Enter units as J/K/mol.

ACK! Finals on SAT! Thanks for the help.......

2006-12-14 23:43:38 · 1 answers · asked by thesekeys 3 in Chemistry

Calculate DSo (degree) for the formation of CH3OH(l) from its elements.

I'm so lost on these thermodynamic problems! Explanations would be greatly appreciated. thanks

2006-12-14 23:41:51 · 1 answers · asked by thesekeys 3 in Chemistry

We have a 10% aqueous solution and have to replace it. However, I can only find the solution in 0.01N, 0.025N, 0.0375N, 0.1N and 1.0N. Which one is the right one? and Why?

2006-12-14 23:40:14 · 4 answers · asked by Lopinion 1 in Chemistry

Without referring to tabulated thermodynamic information, predict the sign of DSsysfor each of the following processes. (For each statement select P-Positive, or N-Negative. Then enter all 6 correct letters, in order: PPNNPN, for example.)

1. NH3(g) + HBr(g) -> NH4Br(s)
2. NaClO3(s) -> Na+(aq) + ClO3-(aq)
3. D) 2NO2(g) -> N2O4(g)
4. E) CaCO3(s) + 2HCl(aq) -> CaCl2(aq) + H2O(l) + CO2(g)
5. F) 2KClO3(s) -> 2KCl(s) + 3O2(g)

Thanks for the help! :)

2006-12-14 23:40:06 · 1 answers · asked by thesekeys 3 in Chemistry

Please take me through each step, I'm quite good at maths but I don't know that much so explain properly please.
Apparently it's a real number.

2006-12-14 23:38:19 · 6 answers · asked by mongrel73 1 in Mathematics

2006-12-14 23:37:27 · 7 answers · asked by sam 1 in Botany

(Other than E=MC^2! & A^2+B^2=C^2) why?

2006-12-14 23:35:12 · 6 answers · asked by jennifer g 7 in Mathematics

I've heard about plasma power sources from video games like Doom and Turok, and sci-fi shows like Star Trek, but what is it and how does it work? Is there a use for it in real life?

2006-12-14 23:31:13 · 8 answers · asked by The Nomad Yokai 3 in Physics

2006-12-14 23:27:36 · 16 answers · asked by DAVID B 1 in Other - Science

2006-12-14 23:25:43 · 9 answers · asked by Anonymous in Astronomy & Space

2006-12-14 23:25:09 · 2 answers · asked by Anonymous in Zoology

2006-12-14 23:22:44 · 13 answers · asked by amazing_sweet_angel 1 in Chemistry

hello. again nisha! what is the time difference between our india and international space station? ( my teacher asks the question?

2006-12-14 23:21:54 · 3 answers · asked by Nisha, 5th std, TamilNadu, INDIA 1 in Astronomy & Space

Please help I honestly don't know how to do this one.

Jim knows that x is an integer greater than 2 and less tahn 8. Kim knows that x is an integer less tahn 9 and greater than 4. Tim knowns that x is an integer greater than or eqaul to 2 and less than or equal to 6. How many possible values are there for x? What are the possible values for x?

2006-12-14 23:21:46 · 9 answers · asked by Anonymous in Mathematics

which is the coolest place of earth and the hottest place of the earth?

2006-12-14 23:21:30 · 16 answers · asked by kabir 1 in Weather

Actually it means like why do girls have more density than boys do. This question was from a science teacher i need help pls. and no malicious stuff pls.

2006-12-14 23:16:40 · 9 answers · asked by Jane N 1 in Physics

I will be in Houston for a week after Christmas and I was just wondering if the shuttle was going to be landing there and within that time frame. I figure that would be a pretty cool thing to see. Any information you might have about when this shuttle is coming back to Earth will be appreciated! Thanks

2006-12-14 23:12:03 · 3 answers · asked by pts1021 2 in Astronomy & Space

2006-12-14 23:05:30 · 4 answers · asked by babykitty1800 1 in Botany

2006-12-14 23:03:14 · 14 answers · asked by Zefram 2 in Astronomy & Space