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Science & Mathematics - 11 November 2007

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

"If z = x + yi express z - 2 -6i in the form A + Bj where A and B are real expressions in x and y".
Where i is the imaginary number sqrt(-1).

I can't do that without assuming z - 2 - 6j = 0, can I?

2007-11-11 07:11:04 · 3 answers · asked by Matthew H 2 in Mathematics

help!! i really researched for the answer but couldn't find it! if u give me a website for it or just gimmme the answer doesnt matter. please thanx!

2007-11-11 07:09:03 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2007-11-11 07:07:28 · 6 answers · asked by cassidy 1 in Mathematics

2007-11-11 07:07:14 · 5 answers · asked by PattyS 1 in Biology

What kind of gas is released in farts?

2007-11-11 07:05:40 · 5 answers · asked by Anonymous in Other - Science

It's due tommorrow. Thanks.

2007-11-11 07:04:58 · 7 answers · asked by Anonymous in Mathematics

its an algebriac expression that needs to be simplified.

2007-11-11 07:04:16 · 15 answers · asked by Jenny T 1 in Mathematics

:D is there like a formula to find your average height???

2007-11-11 07:03:12 · 2 answers · asked by ♥ Hollister Princess ♥ 2 in Mathematics

It is a cave in Carlsbad, New Mexico. Please help!!!

2007-11-11 07:01:45 · 4 answers · asked by Anonymous in Geography

Can u tell me the answers to these questions and plz explain why?
1. The type of energy used by living organisms exists as the energy --------------
a. in the nuclear area of atoms
b. that bonds atoms together into molecules
c. of motion, which all organisms possess
d. stored as heat in certain molecules

I think the answer is b for #1........But why?? and if u can.. plz explain why it is not D....like u can give an example :)

2. In an ecosystem, matter and energy are --------
a.Different, because energy cycles and matter flows
b. Different, because matter is cycled but energy is not
c. Similar, because both matter and energy cycle within the system
d. Similar, because both matter and energy flow through the system only once.

im gonna post more of these questions in the title biology questions #2

so help me with those too if can plz!

2007-11-11 07:01:31 · 1 answers · asked by Anonymous in Biology

what is the derivative of this?

t/(t^(2) +1)

is it (-t^(2) +1)/ (t^(2) +1)^2?

are we able to simplify that any further?

2007-11-11 07:00:26 · 3 answers · asked by Anonymous in Mathematics

I really need some answers!!! Please reply!

2007-11-11 07:00:02 · 2 answers · asked by llamalover14 1 in Botany

Please reply ASAP!!! thx.

2007-11-11 06:58:07 · 2 answers · asked by CrazyCatLady 2 in Geography

Does this question belong in the science section or paranormal section? I just don't know. The word skeptic seems to belong in the paranormal section but then there is the word brain that would belong in the science section. so confusing.

2007-11-11 06:57:23 · 13 answers · asked by Father Ted 5 in Other - Alternative

Determine whether the series:

Summation as n = 1 and goes up to infinity of (1 / (n ^ 2 + 5n + 6).

2007-11-11 06:54:56 · 6 answers · asked by Blade 2 in Mathematics

My friend thinks that the sky is blue coz of water which we know isn't true but why does bath water run out the tap and lokks blue when it's settled?

2007-11-11 06:49:35 · 13 answers · asked by dale4141 2 in Earth Sciences & Geology

I've looked all over but I can't find the answers to these, so here goes:

1) This is combined in a special way to form glucose:
_ _ _ _ o _ _

2) That which is outside the cell:
_ _ _ r _ c _ _ _ _ _ a _

3) Structures responsible for cell transport:
_ _ b _ _ _ _

Any help would be awesome. Thanks!

2007-11-11 06:48:07 · 3 answers · asked by the sicilian tarantula 2 in Biology

Nitric oxide, NO, reacts instantly with oxygen gas to give nitrogen dioxide, NO2, a dark brown gas.
In one experiment 18.49 g of NO is mixed with 13.15 g of O2.

How many grams of NO2 will be produced?

2007-11-11 06:47:59 · 1 answers · asked by Anonymous in Chemistry

over heated iron wool.If the total pressure is 866 mmHg, calculate the partial pressures of N2 and H2.

How do u solve this equation, can u plz explain on wht to do with these type of equations. n also if u can show fully how u got ur answer so i know how to do it . thanks in advance

2007-11-11 06:45:39 · 4 answers · asked by Rehena Khan 2 in Chemistry

Please show your method!

2007-11-11 06:43:21 · 9 answers · asked by Millie E 1 in Mathematics

Find the general solution of the following first-order linear differential equation:

2007-11-11 06:41:06 · 2 answers · asked by dimachevelle 2 in Mathematics

Finally, suppose m1 -> infinity, while m2 remains finite. What value does the the magnitude of the tension approach?

I think the answer is infinity but i'm not sure.

2007-11-11 06:38:35 · 1 answers · asked by Aeds 2 in Physics

Hey,

I missed a class on Vertical Circular Motion.

If someone could please give me a brief lesson on it. How to figure out minimum speeds in regards to staying in the circle? How forces work at the top of circles(hill crest)/bottom of circles(hill valleys)/loops(within the circle)?? When Fc = Fg...? Regards to T=Fc+Fg?

Even a link to a site explaining this would be great. Thanks,

2007-11-11 06:35:00 · 2 answers · asked by ApolloLorne 3 in Physics

What is the difference between them when used in a Resistance Temperature Detector (RTD) circuit. Wheatstone Bridge has a rheostat to balance the resistance, does the Callender-Griffith Bridge have a rheostat as well. Also why are three connecting wires used in the Callender-Griffith Bridge circuit. I've tried to find this elsewhere but they have just confused me more. All help is appreciated. I've asked the same in the Engineering Section too but that section is less popular so I thought I would try here. Thanks.

2007-11-11 06:32:53 · 3 answers · asked by Anonymous in Physics

ALgebra help please!!

2007-11-11 06:32:10 · 10 answers · asked by Anonymous in Mathematics

6. The mean of a normal distribution is 400 pounds. The
standard deviation is 10 pounds.

a. What is the area between 415 pounds and the mean of
400 pounds?
b. What is the area between the mean and 395 pounds?
c. What is the probability of selecting a value at
random and discovering it has a value of less than
395 pounds?

2007-11-11 06:30:54 · 1 answers · asked by Patricia F 1 in Mathematics

Are all pennies made out of all copper? Or is it just mixed with copper?

2007-11-11 06:30:19 · 7 answers · asked by blondiee 1 in Other - Science

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