Science & Mathematics - 18 September 2007

As above...pls help me answer my question...how does the above help to increase air ventilation and rid a room of any odour? Thanks!

(kinetic particle theory)

2007-09-18 23:59:35 · 1 answers · asked by SummerRains 2 in Chemistry

i hav a frnd..very gud frnd...n i really wanna make use of telepathy...does it really work or just fictious???

2007-09-18 23:57:36 · 16 answers · asked by Sharon V 1 in Parapsychology

When I hear about them on the news they always land in the desert or something.

2007-09-18 23:54:06 · 9 answers · asked by Anonymous in Astronomy & Space

when the light in the room is switched on , why doesn't there seem to be a delay between turning on the light switch and the light been illuminated ?

2007-09-18 23:49:45 · 3 answers · asked by mrs 2 in Other - Science

Also is an ACRE approximately 70 square feet?

THANKs in advance. (Developers are destroying the field/woods behind my apt. for houses)

2007-09-18 23:49:15 · 6 answers · asked by bereftcat 4 in Mathematics

Is it NO2?

2007-09-18 23:46:42 · 11 answers · asked by Average Joes 4 in Chemistry

Chloride has a -1 charge, but what's the charge for silver?

2007-09-18 23:46:06 · 6 answers · asked by Average Joes 4 in Chemistry

I have no clue what the name for this formula is.

2007-09-18 23:45:22 · 3 answers · asked by Average Joes 4 in Chemistry

Is it phosphorus iodide?

2007-09-18 23:44:42 · 3 answers · asked by Average Joes 4 in Chemistry

Why aren't there any stars in pictures of armstrong on the moon?

2007-09-18 23:43:55 · 13 answers · asked by Anonymous in Astronomy & Space

Phosphorus has a -3 charge, but it states pentabromide is Br5 hwo do you convert the phosphorus charge in there?

2007-09-18 23:43:06 · 7 answers · asked by Average Joes 4 in Chemistry

Any ideas?

2007-09-18 23:41:44 · 2 answers · asked by Average Joes 4 in Chemistry

When I try to solve it I keep getting
H+1(acid) then C6H5O7
What do I do to combine the two H's and what's the actual formula?

2007-09-18 23:40:24 · 4 answers · asked by Average Joes 4 in Chemistry

I believe the formulas are:
MnO2 with the name Manganese (II) Oxide
MnBr4 with the name Manganese (IV) Bromide
am I correct?

2007-09-18 23:38:39 · 1 answers · asked by Average Joes 4 in Chemistry

FIghter pilots and submarine officers have their own way of representing vectors, and they do it three dimensions. Their survival depends on understanding vector approaches instead of saying an airplane is travelling of 400km/hr westward they usually say something like "Bogeys 10 click at 5'o clock high" "check your sives" or "unidentified object detected at 75 mark 8". How do these people represet magnitude and direction?

2007-09-18 23:35:42 · 2 answers · asked by mhark e 1 in Physics

Here's what I've done so far:
(x-1)(x-1)(x-1)-(x-1)(x-1) <-- If there's an easier way, please tell =)
(x2-2x+1)(x-1)-(x2-2x+1)
x3-x2-2x2+2x+x-1-x2+2x-1
x3-4x2+5x-2...

I can't factor anything out )=...

THANK you guys! It means a lot.

2007-09-18 23:32:20 · 12 answers · asked by Anonymous in Mathematics

Three numbers form an arithmetic sequence having a common difference of 4. If the first number is increased by 2, the second by 3, and the third by 5, they form a geometric sequence. Find the original numbers.

2007-09-18 23:32:15 · 2 answers · asked by Askem 2 in Mathematics

2007-09-18 23:12:50 · 3 answers · asked by ultramyk 3 in Zoology

why do they put make up on monkeys? even all those big companies like Loreal are doing tests on animals before selling products to humans? cant they test a possible cure on humans and not on animals? why they dont know if the dose is lethal or not, so they rather sacrifice an animal than risk it on a human?

as far as I know that in history some leaders ordered to make those tests on prisoners, cause prisoners are usually healthy and in the right age. why they dont test on prisoners today even if they would consent?

2007-09-18 23:04:22 · 4 answers · asked by shannon 1 in Other - Science

I'm stuck on a problem, because I don't really understand what mapping is so I don't know what I can and can't do:

The problem is this:
------------------------------
Suppose that f:R -> R is a map such that for all x,y in R (the real numbers)

f(x+y) = f(x) + f(y) and f(xy) = f(x)f(y)

Prove that f is either:
1) the identity mapping for all x in R. i.e. f(x)=x,
or
2) the zero mapping for all x in R. i.e. f(x)=0
------------------------
he gave us one hint, that somewhere in our proof that the fact that every positive real number is a square will be very useful.

I have no idea what to do and any help would be wonderful!

Thanks in advance!

2007-09-18 23:02:50 · 2 answers · asked by greeneggs4spam 3 in Mathematics

I was told that a doctor could read the results of a nuclear stress test and determine the findings as soon as the test is completed. The nurse told me it would take at least a week to get the results. Who is correct?

2007-09-18 23:01:00 · 5 answers · asked by Anonymous in Medicine

just wondering..if u threw up something after like 10-12 hours...is the medicine still in your digestive system or already in your blood stream, with no effect of throwing up the food?

2007-09-18 22:59:54 · 2 answers · asked by luckystar21 1 in Medicine

x means times

2007-09-18 22:52:12 · 1 answers · asked by jojo 1 in Mathematics

A brick falls freely from a high scaffold and hits the ground 3.5 seconds. How high is the scaffold? What is the velocity of the brick just before hitting the ground?

please give the step by step solution with formula..thank you!

2007-09-18 22:43:04 · 5 answers · asked by Anonymous in Physics

I don't understand.
Could somebody please explain it using an easy-to-understand example?
Thank you.

2007-09-18 22:42:42 · 4 answers · asked by I need answers 1 in Mathematics

1. Express these two calculator displays in correct metric units: 5.6-07 2.2 05
a. 0.56 micro, 0.022 Meg
b. 56 micro, 22 kilo
c. 0.56 micro, 220 kilo
d. 56 micro, 220 kilo

2. What is the metric value of 16mA?

3. Which of the following terms are not a resistor rating?
a. resistor tolerance
b. resistor value in ohms
c. power rating
d. current

4. 500 milliA is equal to what?
a. 0.5 Amps
b. 0.0005 kA
c. 500,000 uA
d. all of the the above

5. Four resistors are connected in series across an 18 V source. Three resistors drop 0V, and one resistor drops 18 V. What's the trouble?
a. One resistor is open
b. The three resistors are open
c. Two of the resistors are shorted
d. There is no trouble: the voltages are normal

6. If each of the six resistors in a series circuit drops 5 V, the source voltage.....
a. equals 30 V
b. depends on the resistor values
c. equals 5 V
d. depends on the current

2007-09-18 22:37:28 · 2 answers · asked by Anonymous in Engineering

prove that the set {1,x,x^2} is linearly independent?
my confusion is
as we know X^2 -2x +1=0 or x^2+2x+1=0 then how i can show that
a(1)+b(x)+c(x^2)=0 implies a=b=c=0 for linearly independent. a,b,c are elements of field.
similarly how i show {1+x, 1+x+x^2} is linearly independent.

2007-09-18 22:32:11 · 5 answers · asked by amjad 1 in Mathematics

2007-09-18 22:16:00 · 7 answers · asked by aliah_natasya2003 1 in Weather

What volume of 1-butanol corresponds to 0.040 mol? (MW and density of 1-butanol are 74 g mol, 0.806 g mL

a) 3.67mL
b)4.35mL
c)2.96mL
d)2.38mL

2007-09-18 22:10:04 · 1 answers · asked by awoodifield84 1 in Chemistry

are they of the same meaning?

2007-09-18 22:04:36 · 2 answers · asked by saltedpeanut 1 in Chemistry