Science & Mathematics - 10 October 2007

I am in 8th grade and this is for a science fair project. I need to knowhow i can easily and cheeply measur air pollution around my neighboorhood.

2007-10-10 09:59:12 · 2 answers · asked by someone 1 in Earth Sciences & Geology

i have a chemistry question and cant find the answer in the book. It asks
"How many electrons can occupy an orbital?"

i know that for n=1 you get 1
and for n=2 you get 4
and n=3 you get 9

but how high does it go an dhow man can occupy the orbital?

Thanks for your help!

2007-10-10 09:58:52 · 5 answers · asked by john s 3 in Chemistry

plz hurry

2007-10-10 09:57:43 · 5 answers · asked by funnypun 2 in Engineering

2007-10-10 09:53:53 · 5 answers · asked by Anonymous in Astronomy & Space

2007-10-10 09:50:00 · 3 answers · asked by harvardcutie25 1 in Biology

booger- nasal mucosal excrement? lol, thoughts

2007-10-10 09:49:56 · 4 answers · asked by Peter Griffin 6 in Medicine

How long does it take for the bipolar medication to set in?

2007-10-10 09:48:05 · 2 answers · asked by Anonymous in Medicine

what do you think about the theorys that sceintists explain surrounding the summerian people and planet x. true? or false ?

2007-10-10 09:46:58 · 6 answers · asked by alize 1 in Astronomy & Space

Look at my Y! question from yesterday "Will the newly formed Northwest Passage cause new "cold" war? Then go to Y! news videos and watch Fox news video, Arctic Conflict dated 1hr 14min ago as of 2:30 PM here. I got chills as I watched, eerie... I swear, by the Constitution, I never saw this video before today.

2007-10-10 09:46:54 · 22 answers · asked by mazeman25 3 in Parapsychology

b) the normal at the origin cuts the curve again at O. Find the coordinates of P

Could you please explain how to do this because i have no idea how to do it. Thanks!

2007-10-10 09:43:18 · 1 answers · asked by Ryujin 3 in Mathematics

Why does differentiating "xlnx" give 1/e

2007-10-10 09:40:59 · 3 answers · asked by C4 Snake 3 in Mathematics

i combined acetic acid and sodium (l) bicarbonate and captured the gas. How would i find the volume of the gas?

2007-10-10 09:40:44 · 2 answers · asked by Anonymous in Chemistry

A ball falls from the top of a roof and its initial speed is 20m/s and the acceleration of gravity is 9.8m/s^2. How do I find how long it takes the first ball to hit the ground?

2007-10-10 09:37:44 · 1 answers · asked by KE 1 in Physics

A rocket blasts off from rest and attains a speed of 45 in 15s. The astranaut has a mass of 57kg.

2007-10-10 09:33:37 · 1 answers · asked by betty 1 in Physics

I've posted this like twice, it seems no one knows the answer!

http://tinypic.com/view.php?pic=4yty33n&s=1

1. m angleTRS > m angle WUV

2. DE > AB

3. m angle 1 > m angle 2

I don't know what 1 is, but i think 2 is sas, and 3 is corresponding. HELP?

2007-10-10 09:31:40 · 2 answers · asked by Randy M 1 in Mathematics

It is an interesting and speculative thing. I know plenty on the subject but I want to see what you think.

2007-10-10 09:30:23 · 6 answers · asked by Math☻Nerd 4 in Astronomy & Space

A truck driver with an initial speed of 30m/s spots an armadillo in the road ahead and begins to brake at a rate of 2 m/s^2 for 10 seconds. how far does her truck travel?

2007-10-10 09:28:37 · 1 answers · asked by qt123 1 in Physics

among 100 coffee drinkers, 36 said that they preferred their coffee black and the rest did not prefer their coffee black. Find the ratio of those who prefer black coffee to those who prefer nonblack coffee.

2007-10-10 09:26:49 · 12 answers · asked by Pep C 1 in Mathematics

The height of a helicopter above the ground is given by h = 3.00t^3, where h is in meters and t is in seconds. After 2.00 s, the helicopter releases a small mailbag. How long after its release does the mailbag reach the ground?

the answer in the book is 7.96 seconds, but can someone explain how to get that?

2007-10-10 09:26:36 · 2 answers · asked by Anonymous in Physics

With every other dominate species wiped off the earth by a mass extinction. Do you believe when it's humanities turn that machines are the next dominate force on the planet? We are talking humans living another 2500 to 5000 years. So machines have time to become Self aware. Not a Terminator scenario.

2007-10-10 09:23:30 · 4 answers · asked by moscow1677 2 in Astronomy & Space

a+4/2=a+4/a

2007-10-10 09:20:18 · 3 answers · asked by Pep C 1 in Mathematics

(1) The relation between Celsius and Fahrenheit scale of temperatures is given by:C = (5/9)(F - 32), or, F = (9/5)C + 32.Calculate the temperature in Celsius if the temperature in Fahrenheit is 45°F. Also, calculate the temperature in Fahrenheit if the temperature in Celsius is 98°C.

(2) The perimeter of a swimming pool is 96m. The width is 3m more than half the length of the pool. Find the length and breadth of the pool.

2007-10-10 09:19:09 · 2 answers · asked by MaRs 1 in Mathematics

A spring with k = 10.0 N/m is at the base of a frictionless 30.0° inclined plane. A 0.50 kg object is pressed against the spring, compressing it 0.1 m from its equilibrium position. The object is then released. If the object is not attached to the spring, how far up the incline does it travel before coming to rest and then sliding back down?
____m

2007-10-10 09:16:13 · 2 answers · asked by Anonymous in Physics

could you please explain how to do this/show working out, thanks

2007-10-10 09:14:23 · 2 answers · asked by Ryujin 3 in Mathematics

The heatt experienced by a hiker at a campfire is proportional to the amount of wood on the fire, and inversely proportional to the cube of his distance from the fire. If he is 20ft from the fire, and someone doubles the amount of wood burning, how far from the fire would have to be so that he feels the same heat as before?

So far I got this H = x W/d

H= heat
w= wood
d= distance

and then I got this H = x w^2/20^3

Ok what do I do now?

2007-10-10 09:12:47 · 1 answers · asked by Pipos 1 in Mathematics

For a given linear circuit, the output voltage is 5V when an input voltage of 20V is applied to the circuit. What is the output voltage if 16V is applied to the circuit?

A. 20V
B. 4V
C. Must use Kirchhoff's laws to determine.
D. 8V

2007-10-10 09:10:06 · 8 answers · asked by humphrad 1 in Engineering

find the value of k which results in the equation

kx^2 + 2kx - 1 = 0

having equal roots, given that k does not = 0


i did b^2 - 4ac = 0

therefore 2k^2 - 4k + 4 = 0

but i cant factorise this :s is this correct? what now if so :s

do i use -b +/b^2-4ac / 2a?

2007-10-10 09:09:44 · 6 answers · asked by AP12 2 in Mathematics

I know Marilyn Monroe died of this.

But what is overdose?
Does the heart beat non-stop?
Does the user have a cerebral palpsy?
Stroke?

Intoxication? Huh?

2007-10-10 09:07:02 · 5 answers · asked by James 3 in Medicine

2007-10-10 09:04:23 · 2 answers · asked by Jasmine R 2 in Mathematics

convert the rational expression into an equialent rational expression with LCD as the denominator

4/x-y , 5x/2y-2x

2007-10-10 09:04:03 · 2 answers · asked by Anonymous in Mathematics