Science & Mathematics - 3 August 2007

I have a question about impulse. So, impulse equals change in momentum or average force * change in time. So I have a couple of questions actually. Does impulse only apply for extremely small changes in time? Like if a car crashed and was in contact with something for a second before it stopped, is that still considered 'impulse'? Also, via the formula, the impulse becomes greater when the change in time becomes greater. But I thought there was a larger impulse when time was smaller? If anyone could help clear these up for me that would be great. Thanks :)

2007-08-03 14:51:34 · 3 answers · asked by Bob R. 6 in Physics

x²+2ax=b
work:
(x+a)²-2a=b

This would make sense, we would have to complete the square by mutiplying "2" and then squaring it.
(x+a)²-4a²=b
(x+a)²=4a²+b
x+a=√4a²+b
x+a=2a√b
then..
x=a√b

How would it make sense skiping by mutiplying "2", and replacing it by ² to get -a² instead of just 4a²?
(x+a)²-a²=b

see?

2007-08-03 14:50:34 · 5 answers · asked by Anonymous in Mathematics

In R^n (with respect to the Lebesgue measure) without using the Axiom of Choice? All the examples I've seen, like Vitali's set, are constructed resorting to the Axiom of Choice. If AC is mandatory, then does this mean non measurable sets have a, say, virtual but not actual existence?
Thank you.

2007-08-03 14:47:14 · 1 answers · asked by Steiner 7 in Mathematics

I know real jewelry is made of gold and a bit of copper to make it hard.

But what is in fake jewelry???

2007-08-03 14:47:14 · 2 answers · asked by Matt21 3 in Chemistry

x²+2ax=b
work:
(x+a)²-2a=b

This would make sense, we would have to complete the square by mutiplying "2" and then squaring it.
(x+a)²-4a²=b
(x+a)²=4a²+b
x+a=√4a²+b
x+a=2a√b
then..
x=a√b

How would it make sense skiping by mutiplying "2", and replacing it by ² to get -a² instead of just 4a²?
(x+a)²-a²=b

see?

2007-08-03 14:36:09 · 3 answers · asked by Anonymous in Mathematics

2007-08-03 14:35:04 · 4 answers · asked by david w 1 in Botany

I just wanna know what it is that keeps someones mind so closed that they can't even for a second try to understand that there may be more than they know about in this world.

I personally think that if you close your mind to new things that you stagnate and quit learning. Maybe I need answers from a skeptic that has had something happen to them that has opened their mind up since they have been on both ends of the spectrum.

2007-08-03 14:33:53 · 21 answers · asked by advwizard 1 in Paranormal Phenomena

http://www.thecuteproject.com/images/items/1236.jpg

2007-08-03 14:30:42 · 2 answers · asked by Anonymous in Zoology

http://farm2.static.flickr.com/1047/1001754473_b771f0b360_o.jpg

2007-08-03 14:29:58 · 5 answers · asked by Sidereality 3 in Botany

I know little of physics. Imagine if medical procedures once "invasive" due to cutting, like the retrieval of an organ, became less invasive because of a device that would allow the organ/body part to somehow pass through the skin unharmed. "Star Trek's" teleportation is fiction. What is a believable method? I read a little about "gravity waves", that they can pass through things unchanged, but I don't understand their application to the conversion of matter to energy in this situation. Could an organ be converted to a gravity wave, pass through skin, and then be usuable?
In Greg Iles "Footprints of God", the brain was scanned with an MRI and was uploaded to a computer, and the computer became the person. Replication/cloning leaves too much room for error. Could anything allow something to pass through the skin unchanged? Could a solid matter to energy conversion take place to allow an organ to pass through the skin, to then be converted back? What device(real or not) could do it?

2007-08-03 14:26:42 · 6 answers · asked by attyoncall 3 in Physics

2007-08-03 14:21:04 · 10 answers · asked by Anonymous in Astronomy & Space

find the slope of the line passing through the points (-1,3) and (7,3)

is it 0,1,8 or undefined?

2007-08-03 14:14:57 · 7 answers · asked by busy me 2 in Mathematics

I AM IN 7TH GRADE SO PLEASE TRY TO SPEAK NORMALLY, NOT SOPHISTICATED, SO THAT I CAN ACTUALLY UNDERSTAND YOU!! thx1lol

2007-08-03 14:07:45 · 4 answers · asked by superstarr. 1 in Mathematics

an employee who produces x units per hour earns an hourly wade of y=0.7x+7 (in dollars) find the hourly wage for an employee who produces 17 units per hour.

2007-08-03 14:02:06 · 11 answers · asked by busy me 2 in Mathematics

2007-08-03 14:01:41 · 4 answers · asked by booboobear_619 1 in Mathematics

1) 5x-y=5
3x-5y=-63

2) how do i solve for all three variables
a-b+3c=-8
2b-c=15
3a+2c=-7

Also what are the two methosd of solvuing systems of equations algebracially?

2007-08-03 13:54:36 · 4 answers · asked by Anonymous in Mathematics

myoglobin is the storage of oxygen in muscle

2007-08-03 13:51:30 · 1 answers · asked by syara_xxy 1 in Botany

I am going into my Sophomore year of high school and am scared of taking Chemistry. Is it really hard?? I am not taking honors or AP or anything but I realize most people take it there Junior not Sophomore year and it is making me nerovus.

Note: I am a girl not a guy I'm just using my dad's username

2007-08-03 13:30:04 · 13 answers · asked by ? 2 in Chemistry

Work.
3x²-5x-8=0
(x-5/6)²-25/36=8/3
(x-5/6)²=8/3+25/36
...................
96/36+25/36=121/36
right?
If it is possible for me...Then I would do it in a formula, but I have to do the other way cause of my teach.
...............
(x-5/6)²=121/36
x-5/6=+/- 11/6
x=-6/6,16/6
x=-1,6

help, why do I suck at math?
And why must we *2 and square it anyways?
How is this suppose to help us in the real world, everything in quad. equations would always =o, then why would we solve it when we already know the equation ='s "0"?

2007-08-03 13:29:53 · 6 answers · asked by Anonymous in Mathematics

i saw it on a commercial on TLC that they mentioned weather control and that katrina was moved. but that show doesnt come on until sunday and i will most probally miss it

ps. im from new orleans

2007-08-03 13:25:52 · 9 answers · asked by Anonymous in Weather

Is it because of the pH of the blood? What exactly happens to the brain during ketoacidosis. Help!
The mechanism that I have doesn't seem complete. I have tried many books.
I know that there will be an increase in ketone bodies, how the ketones are toxic and it decrease pH.

So? What exactly happens to the brain that causes coma? The answers I have found so far are so very vague.

Help!

2007-08-03 13:20:34 · 2 answers · asked by Fiffy Ferrari 2 in Medicine

A={-1,0}
{0, 5}

B= {3 0 2}

C={1 6 0}
{-5 0 -3}
{0 4 -1}

D={8}
{9}

1) Name an element in matrix A
2)Name a coulumn matrix
3) Name a row matrix
4) Name the square matrices
5) give the dimensions of matrix B
6) The number 4 in matrix c is in what position?
7) Multiply matrix A times D is the answer [-8 -45}?


please tell me how you get these answers because i have never done matrics and i do not have a book. thank you to anyone who helps

2007-08-03 13:17:34 · 4 answers · asked by Anonymous in Mathematics

2007-08-03 13:10:29 · 12 answers · asked by Moon 1 in Physics

Fractions I forgot how to do....it's summer aww

Is it.
8/3*12 so we must have denomenator to "36"
8/36 then we would have to take 8*12???

Or

2 2/3*12 then it would be 2 24/36???

2007-08-03 13:07:08 · 19 answers · asked by Anonymous in Mathematics

Look here at work..shown
EXAMPLE A
x²+2/3x-3=0
(x+1/3)²-1/9=3
(x+1/3)²=28/9
x+1/3=2sqrt7/3
ect....

1) In this equation we don't times "2" in the denomenator of 1/3 in (x+1/3)² why???

EXAMPLE B
x²+1/4x-1/2=0
x²+1/4x=1/2
(x+1/8)²-1/64=1/2
ect...

2)In example B, we times "2" and squared it to get -1/64 why???

3)Why are example A and example B different, with *2 and squaring it and without it?

2007-08-03 13:03:56 · 3 answers · asked by Anonymous in Mathematics

hiya so heres my questions...
do everyone have a tornado shelter in the back garden? if not where do you go? and what happens if you live in a flat?
how much warning time do you have before it comes?
and how do hospitals evacuate in such little time? (assuming warning time is around 5mins)
thanks for your answers!:D xx

2007-08-03 13:03:14 · 12 answers · asked by Anonymous in Weather

Solar systems are spread so far apart. Why is this???

2007-08-03 13:01:33 · 7 answers · asked by Anonymous in Astronomy & Space

A sample of SO2 gas which weighs 0.81 grams has a volume of 1.20 liters when collected at 25 degrees celisus.What would be the pressure of the gas sample?

2007-08-03 12:57:07 · 3 answers · asked by Anonymous in Chemistry

2007-08-03 12:56:34 · 5 answers · asked by dude11 2 in Physics

If we had.
3x²-5x+2=0
The rules says that if we do one thing to one side we must to the same thing to the other.
If we would get 3x² to just x², we would have to divide both sides by "3" "Once to one side than the other side" Like a regular equation.
ex.

3x²/3-5x=-2/3
would be.
x²-5x=-2/3
But to really solve it we must divide "5" by "3" too, it makes no sense.

How is that we must take -5 and divide it by 3???
Why isn't it playing by the rules?

2007-08-03 12:55:17 · 10 answers · asked by Anonymous in Mathematics