Science & Mathematics - 21 October 2006

I don't need the questions done, just some sort of idea of how to start them. Any help would be appreciated.

Oxygen at pressures much greater than 1 atm is toxic to lung cells. Assume that a deep-sea diver breathes a mixture of oxygen and helium (He). By weight, what ratio of helium to oxygen must be used if the diver is at an ocean depth of 47.0 m?
Round your answer to three significant figures

In a period of 1.60 s, nitrogen molecules strike a wall of area 4.2 cm squared If the molecules move at a speed of 340 m/s and strike the wall head-on in elastic collisions, what is the pressure exerted on the wall? (The mass of one molecule is 4.68 x10^-26)
Round your answer to three significant figures.

2006-10-21 03:58:23 · 2 answers · asked by Anonymous in Physics

predict this product?

isopropylcyclopentane + 2Br2 (light and CCL4)

2006-10-21 03:57:24 · 1 answers · asked by Anonymous in Chemistry

there should be alloys of iron,copper,aluminium

2006-10-21 03:54:26 · 7 answers · asked by SHILADITYA 1 in Physics

2006-10-21 03:53:57 · 29 answers · asked by Anonymous in Astronomy & Space

2006-10-21 03:48:03 · 18 answers · asked by Anonymous in Astronomy & Space

2006-10-21 03:46:25 · 7 answers · asked by Theandysullivan 3 in Mathematics

2006-10-21 03:42:17 · 6 answers · asked by SHAKIYA K 1 in Other - Science

2006-10-21 03:39:51 · 13 answers · asked by Anonymous in Physics

as it is always on the other side of the sun to earths orbit

2006-10-21 03:38:44 · 31 answers · asked by gizzmo 1 in Other - Science

And insects in general.

2006-10-21 03:35:43 · 17 answers · asked by Anonymous in Biology

2006-10-21 03:27:34 · 9 answers · asked by LLL H =] 2 in Other - Science

2006-10-21 03:20:06 · 8 answers · asked by Anonymous in Other - Science

2006-10-21 03:14:33 · 3 answers · asked by neilstech01 1 in Weather

2006-10-21 03:11:10 · 21 answers · asked by Richard 1 in Geography

1)Imidiazole ,a base with pKb=7.01
2)1-NAPHTOL with pKa=9.34
3)morpholine,a base with pKb=8.5
4)HClO2 with pKa=1.95
5)HSCN with pKa =.090

2006-10-21 03:09:01 · 2 answers · asked by Anonymous in Chemistry

cranial nerves involvement / fever&night sweat with meningitis signs / focal convulsion.

2006-10-21 03:06:30 · 2 answers · asked by Anonymous in Medicine

please give me equations of chemical reaction. thanks. and what type of reagent is the water molecule in this reaction.
HBr +H2O > H3O* +Br-

2006-10-21 03:03:29 · 8 answers · asked by milkshake 2 in Chemistry

I read an article about a company in Japan (I think Sony) discussing a possible future plan of their space program launching a giant sheet of semi reflective celofane into a geo-stationary orbit over Japan so they could shine ads, etc.. on it with a laser at night. The US govt responded negatively to this saying it would block the view of the night sky, look trashy and amount to no less than high tech spam. They also passed a law where this would be illegal in the US. Two questions: Does anyone know where I can find this news article again? And what is your opinion of this? Spam or Cool High Tech Way To Dress up the Sky on a Cloudless Night?

2006-10-21 03:02:49 · 3 answers · asked by jgbarber65 3 in Astronomy & Space

(pKb=4.76) where C=1 and .01 M

2006-10-21 03:01:34 · 3 answers · asked by Anonymous in Chemistry

(without using recursive formula) then use your formula to find the 23rd term.
3,7,11,15,19,23...

2006-10-21 02:56:11 · 4 answers · asked by Daniella M 1 in Mathematics

2006-10-21 02:53:52 · 1 answers · asked by Anonymous in Chemistry

2006-10-21 02:51:12 · 10 answers · asked by Anonymous in Geography

2006-10-21 02:50:22 · 6 answers · asked by pearl 1 in Chemistry

Are there any sites where you can see pictures or video of the recent rock slide on the Eiger?

2006-10-21 02:49:06 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2006-10-21 02:48:53 · 1 answers · asked by Anonymous in Chemistry

Can an additive model be nonlinear? Can a linear model be nonadditive? Kindly provide examples and references.

2006-10-21 02:48:13 · 1 answers · asked by kashalao 1 in Mathematics

I really can't find the key to my lock so what do i do to solve this problem? Is there anyway to get the locks changed myself? Or do i have to call in a professional? I'd really prefer it if i could somehow change the locks myself... but how do i destroy the lock that I have now? I tried to open it with a bobbypin but haven't had any luck as i'm not a lockpicker =(

2006-10-21 02:45:53 · 6 answers · asked by Anonymous in Other - Science

I have a 1000x130 telescope and would like to add my camera to it. I have searched many website's, Camera store's and telescope stores to find the attachment i need, I'm after an attachment that will connect a camera with a 67mm thread to my focus rack that supports upto 2" tube's anyone know who would supply this fitting,

2006-10-21 02:43:59 · 4 answers · asked by mad_ness777 2 in Astronomy & Space

SE

2006-10-21 02:42:39 · 5 answers · asked by Anonymous in Astronomy & Space

2006-10-21 02:41:10 · 3 answers · asked by Anonymous in Geography