Science & Mathematics - 21 November 2007

Consider the following 3*3 matrix

2 2+i 0
a 4 2i
b c 6

Find values of a,b and c if the matrix is:
(i) Hermitian
(ii) Skew Hermitian

2007-11-21 07:09:59 · 1 answers · asked by nivik 3 in Mathematics

I had a fun but silly question posted in the paranormal section - some winy baby complained to yahoo...my question was - The ghost is now under my sofa - how to remove? Everyone was having fun with it....someone was lacking the "spirit" of the question....what a shame...

2007-11-21 07:05:30 · 17 answers · asked by Anonymous in Paranormal Phenomena

I heard that the planets will align in 2012 and the sun could send out massive solar bursts that could fry half the earth's population.
So I was wondering if there are any links available supporting this theory?
Thanks in advance for all your help!

2007-11-21 07:04:59 · 9 answers · asked by Adelaide B 5 in Astronomy & Space

2007-11-21 07:00:14 · 1 answers · asked by Kris D 1 in Medicine

2007-11-21 06:58:14 · 5 answers · asked by Dicky 1 in Mathematics

What sorts of spirit do you believe in? And is there a personality type that is more commonly drawn to the paranormal?

2007-11-21 06:57:54 · 11 answers · asked by MessieJessie 2 in Paranormal Phenomena

The tissues of a animal can exist for 10,000 years according
to scientist they found a donasour that still had tiny pieces of muscle tissues on him, so they still say that the dinosaur was a million years old.
Liers is what they are. They can't admit that that life on earth
is only between 10,000 to 20,000 years old. One day someone is going to prove all these theories wrong.

2007-11-21 06:57:46 · 7 answers · asked by jonathin l 2 in Biology

what is:
(2+2+2+2*6-7*88/6+55.81*56)8

2007-11-21 06:56:00 · 6 answers · asked by Anonymous in Mathematics

Consider the thremochemical equation :
2 A-A + B-B ~~> 2 A-B-A DH0 = - 200.0 kJ./mol
If the A-A and A-B bond energies are respectively 250.0 and 225..0
kJ/mol. calculate the B-B bond energy.

How is the answer 200KJ? Can't seem to figure it out

2007-11-21 06:55:48 · 2 answers · asked by hpanna47 2 in Chemistry

What effect does air resistance have on a falling object?

a.) increase in kinetic energy

b.) decrease in kinetic energy

c.) increase in potential energy

d.) none of the above


I picked (b). Why am I right/wrong?

2007-11-21 06:51:30 · 4 answers · asked by Anonymous in Physics

I have to do it on the solar system. i need a website which will tell everything about each planet inlcuding pluto

2007-11-21 06:46:29 · 4 answers · asked by sumit_kn 3 in Astronomy & Space

Six equations are listed below.

A. 2x - 2y = 10 B. -2x - 6y = -8 C. 2x + 6y = 8
D. x + 3y = 4 E. x - y = 5 F. -x + y = 4

Using only these equations, write the pairs of equations that form systems with:
a) no solution
A. 2x - 2y = 10
E. x - y = 5

b) one solution
B. -2x - 6y = -8
F. -x + y = 4

c) infinitely many solutions
C. 2x + 6y = 8
D. x + 3y = 4

Did I do this correctly?

2007-11-21 06:44:53 · 2 answers · asked by Madera 2 in Mathematics

have you ever tried light as a feather, stiff as a board?
what happened? did it work.


how about bloody mary....

2007-11-21 06:44:24 · 6 answers · asked by Anonymous in Paranormal Phenomena

What is the limiting reactant when 19.9 g of CuO react with 2.02 g of H2 according to the following: CuO+H2 ---->Cu+H2O

2007-11-21 06:43:11 · 2 answers · asked by Caramel 2 in Chemistry

2007-11-21 06:42:34 · 4 answers · asked by Anonymous in Mathematics

Explain how you think the function got its name. I've graphed this function, but I can't word it how I want to word it... =\

f(x) = ROUND(x) = {...
1, if 0.5 is *less than or equal to* x <1.5
2, if 1.5 is *less than or equal to* x < 2.5
3, if 2.5 is *less than or equal to* x < 3.5
...}


All help is, of course, appreciated!
Thank you!

2007-11-21 06:41:01 · 1 answers · asked by Anonymous in Mathematics

In all imagaic representations I have seen of our solar system, the planets are all essentially on the same line. (eg. http://www.ioncmaste.ca/homepage/resources/web_resources/CSA_Astro9/files/images/unit4/solar_system.jpg).
Is this true, or are orbits going all over the place? And if it is true, is this defined by the sun's 'north' and 'south' magnetic poles... how does the sun's magnetism affect the shape of our solar system? Are gravity fields linked to magnetic fields?

2007-11-21 06:40:12 · 4 answers · asked by Anonymous in Astronomy & Space

2007-11-21 06:40:02 · 4 answers · asked by breakthememories 1 in Medicine

if (ends < start)then
start = 24 - start
hoursWorked = start + ends
else
hoursWorked = ({Incident.ShiftEndTime} - {Incident.ShiftStartTime})
hoursWorked = hoursWorked / 100
end if

2007-11-21 06:39:22 · 3 answers · asked by Blaine W 2 in Mathematics

bigger than our sun and capable to create a massive dent in the space/time coordinate plane,due to it's gravity, could we essentially move from point A on one side of the coordinate plane to point B in a much shorter time? Basically from one side of the massive object to the other, in other words.

This is the law of general relativity, right?

2007-11-21 06:34:19 · 3 answers · asked by Jansen J 4 in Physics

its for a science project. Answers would be greatly appriciated.

2007-11-21 06:28:40 · 2 answers · asked by kYLE-CON! 2 in Chemistry

I heard that it's gonna be in complete alignment with the sun, the moon and the 'birth canal' of the Milky Way or something like that? Supposedly this only happens once every 26,000 years or around that number correct? I also heard that when this happens the Earth will turn upside down, like Canada will be were South America is and vice versa, is that true?

What exactly is supposed to happen in 2012?

2007-11-21 06:25:30 · 18 answers · asked by Anonymous in Astronomy & Space

2007-11-21 06:21:34 · 3 answers · asked by (ƸӜƷ) 1 in Mathematics

how do i know if something is Acids/Bases/Neutral if i was giving the forumla?

2007-11-21 06:19:15 · 1 answers · asked by Ayaa 1 in Chemistry

(a) An ideal gas occupies a volume of 1.0 cm^3 at 20ºC and atmospheric pressure. Determine the number of molecules of gas in the container.

(b) If the pressure of the 1.0-cm^3 volume is reduced to 1.0 X 10-11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container?

2007-11-21 06:15:34 · 7 answers · asked by Anonymous in Chemistry

Husband is a major genius. Degrees in physics and engineering. I have no idea what to buy him for Christmas. He's into robots and his computer, but I don't know enough specs on either one to make intelligent shopping choices for him. I kind of feel like a gift card is a cop out. Any ideas for something engaging to the intellectual type? (p.s. he's not into gaming)

2007-11-21 06:14:01 · 10 answers · asked by awakeatdawn 3 in Physics

The my last question is
"For each of the following naturally occurring oils: Citronella, eucalyptus, cinnamon leaf, nutmeg, clove, rose, jasmine, lavender; -
c) Are there any harmful effects using the chemically produced ones?"

The answer for this question can be view in this website;

http://au.answers.yahoo.com/question/;_ylc=X3oDMTE1MmI4N2IyBF9TAzIxMTU1MDAxMTgEc2VjA2Fuc19ub3QEc2xrA3N1YmplY3Q-;_ylv=3?qid=20071016125901AA6dCdg

My next question is;
- Do you mean to say that synthetic essential oils would have be safer in the sense that they do not contain ketones? As i understand it, ketones are toxic & occurs in natural essentials oils only.
- Why is sage high in ketones but not toxic?

2007-11-21 06:12:57 · 2 answers · asked by md_novilz 1 in Chemistry

alkanes have a high melting point (i worked out that much) but how does this influence their use as fuels?

2007-11-21 06:11:49 · 6 answers · asked by Anonymous in Chemistry

Romeo is chucking pebbles gently up to Juliet’s
window, and he wants the pebbles to hit the window with
only a horizontal component of velocity. He is standing at
the edge of a rose garden 4.5 m below her window and 5.0 m
from the base of the wall ( as in the lower Fig). How fast are
the pebbles going when they hit her window?

2007-11-21 06:05:35 · 2 answers · asked by Anonymous in Physics

this question is killing me i think it is a reactant but can i have some friendly help please:P.I just want to be more sure of this.

2007-11-21 06:03:57 · 3 answers · asked by own y 1 in Biology