Science & Mathematics - 11 July 2007

2007-07-11 17:04:29 · 12 answers · asked by theocurio 2 in Physics

Does any one have a detailed manuel on how high pressured booster pumps work or know where I can find one? They are used for water.

2007-07-11 17:03:49 · 4 answers · asked by Aaron R 1 in Physics

2007-07-11 16:59:53 · 2 answers · asked by RHODA D 1 in Physics

true or false details please

2007-07-11 16:58:55 · 2 answers · asked by Anonymous in Biology

given x = y

x = y
x(squared) = y(squared)
x(squared) - x(squared) = y(squared) - x(squared)
x(x - x) = (y + x)(y - x)
x(y - x) / y - x = (y + x)(y - x) / y - x
x = y + x
x = x + x
1x = 2x

where did i go wrong? where is the flaw? because 1 definitely does not equal 2.

if u get it right, automatic best answer!!

2007-07-11 16:58:23 · 5 answers · asked by tochau 5 in Mathematics

explain please lil short

2007-07-11 16:56:38 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-07-11 16:54:33 · 1 answers · asked by Andre k 1 in Chemistry

A curve is traced by a point P (x,y) which moves such that its distance from the point A(-1,1) is three times its distance from the point B(2,-1). Determine the equation of the curve.

2007-07-11 16:54:07 · 4 answers · asked by lets.dancex3 1 in Mathematics

Please show working.

2007-07-11 16:52:52 · 7 answers · asked by asherspirit 1 in Mathematics

Now you might think I'm kinda dumb should I say because of where I got this from, but I was watching the Fresh Prince of Belair I think yeserday and when will pulled out his father's old sweather, it was big and he said "well, why don't we just throw this up in sky and cover the hole in the ozone layer" or something like that. So is there really a hole in the Ozone layer?? If so why is it there or how did it get there and where is it if it's at a certain spot??

2007-07-11 16:50:35 · 11 answers · asked by Animal-luva4242 3 in Earth Sciences & Geology

the answer would be 1/9 (1 - (5/ rootx)) but how do we do it. im really confused in the steps..

2007-07-11 16:46:55 · 5 answers · asked by biomes 1 in Mathematics

The volume of a sphere is V = (4/3)(pi)r^3 where the radius, r is measured in micrometers (1 micrometer = 10^-6). Find the average rate of change of V with respect to r when r changes from 5 to 8 micrometers?? Am I suppose to find the derivative then solve or solve with the original function?

2007-07-11 16:46:42 · 2 answers · asked by Anonymous in Mathematics

2007-07-11 16:45:00 · 1 answers · asked by Andre k 1 in Chemistry

2007-07-11 16:42:36 · 7 answers · asked by :> er er. 1 in Mathematics

hello I have a family in europe that survives off the land however late someone has been stealing there potatos and i need to find a method to stop this ..they dont have video cameras..Farm) and no land minds would be harsh ..but this is a very serious issue to them as they live off this .. the field is about 1 mile from there house... any ideas... Ps they have tryed stalking the area but this would not be feesable to do all day... warmest regards and thanks for your help ... PPSS...No its not animals stealing there potatoes...a dog would be a good idea to get but they dont have money to sustain a dog.. basic we need a way to catch these guys.. I know its a hard one this is why I am hoping some good minds in yahoo answer would be able to help

2007-07-11 16:42:10 · 3 answers · asked by m k 2 in Physics

Q9--------------A hen lays 3 eggs every day ,one of which hatches and produces a hen the same day.The newly formed hen can start laying eggs from the next day at the same rate as the previous hen and so on.for all the hens that are produced.the other two eggs laid by the first hen hatch on the second day and produces hens which can start laying eggs from the next(third) day at the same rate as the older hens.This process goes on and on.After how many days(minimum) are there 100 unhatched eggs.
a. 12
b. 10
c. 20
d. 6

2007-07-11 16:41:09 · 14 answers · asked by Anonymous in Mathematics

Indefinite integral

1) ∫ [x-3/(2x +3)^2 ] dx
2) ∫ t^2-3/-t^3 +9t + 1 dt
3) ∫ [ x+1 / √ x^2 +2x - 4 dx
4) ∫ x^2/x-1 dx
5) ∫ 2x/x-4 dx
6) ∫ e^x/1+e^x dx
7) ∫ (1/3x-1 - 1/3x+1) dx
8) ∫ (1 + 2x^2)^2 dx
9) ∫ x (1 + 1/x)^3 dx
10 ∫ x cos 2 pi x^2 dx

2007-07-11 16:40:26 · 1 answers · asked by Cantthinkofanickname 1 in Mathematics

A. 3 and 4
B. 4 and 6
C. 4 and 9
D. 4.7 and 5.7
E. 8 and 27

correct answer with explanation will be chosen as best answer!

2007-07-11 16:39:55 · 5 answers · asked by Moohlah. 2 in Mathematics

Q12------------------How many isosceles triangles can be formed having integral sides ,such that perimeter is 22.
a. 10
b. 9
c. 8
d. 5

2007-07-11 16:39:33 · 5 answers · asked by Anonymous in Mathematics

I'm doing an electrolysis experiment. I have one jar (4 Litres of water) and have placed 2 copper electrodes in the jar. I added 5% salt to the water. I filled 2 test tubes to the top with water, covered the top and submerged it in water over the electrodes. I'm using a DC power supply. For some reason the water in the test tube connected to the negative end of the power supply is dropping dramatically, therefore it must be producing hydrogen (I checked this with a 'pop' test). However, the water connected to the positive end (anode_ of the power supply hasn't dropped at all. And aren't I meant to see a 2:1 ratio. I also noticed that the water was turning to a bluish greenish colour. I reduced the sodium chloride concentration to approx. 1.7%. However, still no oxygen was produced. Could someone please help me. If you have further questions, you may email me. This is urgent, so could someone please help me.

2007-07-11 16:36:42 · 3 answers · asked by Anthony 4 in Chemistry

Q21-------------------How many figures are required to number a book containg 150 pages.
a. 450
b. 360
c. 262
d. 342

2007-07-11 16:35:10 · 4 answers · asked by Anonymous in Mathematics

is the particle model of matter theory that if matter/particles are heated then the particles expand and move faster and if the matter/particles are cooled then the particles contract and move slower?

2007-07-11 16:30:53 · 3 answers · asked by whoopedy 2 in Physics

2007-07-11 16:30:26 · 6 answers · asked by michelle 1 in Other - Science

2007-07-11 16:28:00 · 7 answers · asked by michelle 1 in Earth Sciences & Geology

2007-07-11 16:26:49 · 3 answers · asked by LaLa 2 in Weather

thanks!

2007-07-11 16:23:34 · 3 answers · asked by Man Who Disproves All 1 in Physics

The function f is one to one. Find its inverse and check your answer. State the domain and the reang if f and f^-1.

f(x) = 4 / x+2

please help me and explain, I have other problems like this :)

thanks!

2007-07-11 16:20:11 · 4 answers · asked by Anonymous in Mathematics

good question for all you thinkers out there!

2007-07-11 16:17:59 · 11 answers · asked by Frunk A 1 in Medicine

(20) A squre is inscribed in a circle with radius r. what is the probability that a randomly selected point within the circle will not be within the squre?

A. π-2/πr squre
B. π-2/π
C. (π-1/2)/π
D. 1-r/π
E. r/π


(18) In rectangle PQRS above, what is a+b om terms of x?

A. 90+X
B.90-X
C. 180+X
D. 270-X
E. 360-X

(look at the picture i attached)

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please explain me!! thanx

2007-07-11 16:14:52 · 5 answers · asked by ashylnn 1 in Mathematics

A triangle has sides 2x – 5, 3x + 1, and 4x + 2. Find the polynomial that represents its perimeter.

A) 9x – 2 B) (2x – 5)(3x + 1)(4x + 2) C) 10x – 8 D) 24x – 10

2007-07-11 16:13:23 · 4 answers · asked by Somebody 2 in Mathematics