Science & Mathematics - 9 August 2007

The two complex number Z1 = a/(1+i) and Z2 = 3/(1-2i) where a, b are real numbers. are such that Z1 + Z2 = 3. Calculate the value of a and b.

Okay, so i went about solving this question as an ordinary complex question.

a(1-i)/(1+i)(1-i) + b(1+2i)/(1-2i)(1+2i) = 3(1-i)(1+2i)

eventually getting,

(a-ai/2) + (b+2ib/5) = 9-3i

however, that doesn't seem to make the question any easier. and i'm not sure if multiplying the whole equation by 5 will solve the question. As it makes it just as complicated as it was in the beginning..so you guys, show me how to continue on or even better a quicker and easier method..if there is...thanks..ppl

2007-08-09 05:16:47 · 4 answers · asked by SSj4Monkey 1 in Mathematics

This is why I think the theory of evolution should not be taught in school. Darwin had no scientific data to support his theories. Here is a link from Yahoo news about this latest findings

I am interested in all opinions, but please be respectful to others.

http://news.yahoo.com/s/ap/20070808/ap_on_sc/human_evolution

2007-08-09 05:14:05 · 11 answers · asked by Sparkles 7 in Biology

15. Which action(s) will decrease the equilibrium concentration of a non-reacting gas in water?


1. decreasing the temperature of the water
2. decreasing the volume of water
3. decreasing the pressure of the gas above the liquid

a. 1 only
b. 2 only
c. 3 only
d. 1 and 3
e. 1, 2, and 3
how do you know

2007-08-09 05:12:45 · 2 answers · asked by senqq 1 in Chemistry

The moon doesn't rotate on its axis, so if you lived on the part that was facing the Earth, then you would probably not get much Sun, because the Earth would block the sunlight as the Earth rotated and orbited around the Sun, right?

2007-08-09 05:09:36 · 10 answers · asked by eoc1000 2 in Astronomy & Space

2007-08-09 05:06:12 · 15 answers · asked by sharifjunaid 3 in Astronomy & Space

● the ramp is 70 cm long @ various slopes.
● time required to travel 70 cm, various at the different slopes.
○ slope 1 = 3 seconds
○ slope 2 = 2 seconds
○ slope 3 = 1.8 seconds
The difference in elevation for the slopes are
○ slope 1 is elevated 2.1 cm
○ slope 2 is elevated 3.8 cm
○ slope 3 is elevated 5.3 cm

2007-08-09 05:02:34 · 2 answers · asked by benzene boy 1 in Physics

Sunset rents an SUV at $21.95 plus $0.23 per mile. Sunrise rents the same vehicle for $24.95 plus $0.19 per mile. For what mileage is the cost the same?

2007-08-09 04:58:57 · 8 answers · asked by Anonymous in Mathematics

(hypothetical question)
If you have 1.8 gallons of gasoline, each which stores 100 mega Joules of energy which is released by burning the gas, and you could convert all the PE to KE of a rocket (60 kg).
☺ how fast would the rocket travel?
☺ if converted to gravitational PE how high could you fire the rocket?

2007-08-09 04:58:09 · 4 answers · asked by benzene boy 1 in Physics

i heard that suppose someone enters a black hole,it is assumed that time would slow down,the objest that's passing through will stretch and we'll reach another universe.is there any other theory? and what exactly is a "singularity".please recommend some books!

2007-08-09 04:53:14 · 12 answers · asked by eptmuvrmdmns 1 in Astronomy & Space

It seems like I heard somewhere before it was because it had to be just one frequency of light, but I tried it with my red led light and still no interference.

2007-08-09 04:52:36 · 6 answers · asked by Mark M 1 in Physics

Hey,
gonna build a jet engine and an aircraft that can run on this engine. Anybody interested in my this projet can contacted me to my email add: myvoyage_2andromeda@yahoo.com.
Your suggestions are welcomed.

2007-08-09 04:49:49 · 3 answers · asked by Anonymous in Engineering

The dark side of the force, uh, moon is covered with craters.

2007-08-09 04:49:06 · 10 answers · asked by Tweed 1 in Astronomy & Space

Over in R&S, a good many of us "drink" every time someone say "Evolution is just a THEORY" or "If we came from monkies[sic] then why are there still monkies[sic]?" If they offer Pascal's wager, we answer with *drink*.

With the new anthropological discover on Yahoo's front page, we are getting too drunk to fight the good fight. Here's on example:

http://answers.yahoo.com/question/index;_ylt=Aivbu3ws1aidJdUpAt7aVwXd7BR.?qid=20070809082836AAr5c0v

Please come help... I can't see straight anymore!

2007-08-09 04:43:07 · 7 answers · asked by ZombieTrix 2012 6 in Biology

2007-08-09 04:42:43 · 21 answers · asked by Bangers 1 in Physics

And is the core of the Sun similar to the core of the Earth?

Are they both scattered bits from the enormous Big Bang, assuming the Big Bang occured of course?

Is the Sun just a large piece scattered from the Big Bang, whereas the planets were the much smaller pieces, that because of its smaller size did not remain hot like the sun has?

2007-08-09 04:41:33 · 8 answers · asked by eoc1000 2 in Astronomy & Space

2007-08-09 04:38:24 · 7 answers · asked by Anonymous in Mathematics

please help me to find the inverse of this and check by composition of function.

f(x) = x-4/x

please show me the solution.. thank you all!

a

2007-08-09 04:34:03 · 4 answers · asked by xah8 1 in Mathematics

People are being born without wisdom teeth, and theur smalls are slightly smaller.

What will the next change be?

2007-08-09 04:32:20 · 7 answers · asked by Anonymous in Biology

2007-08-09 04:28:20 · 16 answers · asked by NaNditta 2 in Astronomy & Space

benzene, phenol, nitrophenol, aniline and acetanilide

2007-08-09 04:27:10 · 1 answers · asked by Anonymous in Chemistry

Theory of relativily clearly states that energy can never be lost, only trasferred. So what does this say about the energy that each photon carries?

2007-08-09 04:26:43 · 7 answers · asked by ionbreather 2 in Astronomy & Space

Nikola Tesla found that the Earths resonant frequency is 7hz
How did he go about finding that?

2007-08-09 04:25:24 · 1 answers · asked by Anonymous in Physics

An equation is being tested for symmetry with respect to the x-axis, the y-axis, and the origin. Explain why, if two of these symmetries are present, the remaining one must
also be present.

Thank you

2007-08-09 04:24:50 · 3 answers · asked by no idea 2 in Mathematics

2007-08-09 04:23:25 · 6 answers · asked by Heather 3 in Astronomy & Space

2007-08-09 04:22:08 · 6 answers · asked by Tekken 1 in Other - Science

I need a circuit that will give me atleast 0.5ms of delay for another electronic circuit tht gives an output of 5V dc max.... (the circuit gives a DC o/p). Plz suggest a few circuit diagrams/ links to construct the delay circuit.....

2007-08-09 04:17:51 · 2 answers · asked by raut_onkar 1 in Engineering

4. As molecular solids, which of the following will exhibit dipole-dipole intermolecular forces: PH3, SO3, Br2, and SiCl4?

a. PH3 only
b. PH3 and SO3
c. SO3 and SiCl4
d. Br2 and SiCl4
e. PH3, SO3, and SiCl4

How can you tell???? and whats the answer

2007-08-09 04:16:51 · 1 answers · asked by j d 1 in Chemistry

Will the population on Answers that keep acting like evolution is a law rather than a theory ignore this evidence and continue to make unfounded claims? Will the schools continue to teach the theory as is?

News clip:
The old theory is that the first and oldest species in our family tree, Homo habilis, evolved into Homo erectus, which then became human, Homo sapiens. But Leakey's find suggests those two earlier species lived side-by-side about 1.5 million years ago in parts of Kenya for at least half a million years. She and her research colleagues report the discovery in a paper published in Thursday's journal Nature.

2007-08-09 04:14:24 · 15 answers · asked by Automation Wizard 6 in Biology

2. Which one of the following substances will exhibit dipole-dipole intermolecular forces?

a. C2H4
b. SO2
c. CO2
d. F2
e. Ar

How can you tell? and whats the answer?

2007-08-09 04:12:59 · 1 answers · asked by j d 1 in Chemistry

1. Place the following cations in order from the lowest to the highest hydration energy.

a. K+ < Ca2+ < Cs+
b. K+ < Cs+ < Ca2+
c. Ca2+ < K+ < Cs+
d. Ca2+ < Cs+ < K+
e. Cs+ < K+ < Ca2+


how does hydration energy work? and whats the answer?

2007-08-09 04:11:54 · 1 answers · asked by j d 1 in Chemistry