Science & Mathematics - 13 November 2007

I've heard, that for EACH nuclear explosion, there's a statistical chance the WHOLE atmosphere will blow up and thus eliminating mankind. It was estimated that the chance was once in a million or so. But i heard that number many years ago. What's the current view on this?
Maybe the chance is 1 in only 1000 or so?

2007-11-13 11:46:31 · 1 answers · asked by · 5 in Physics

what is the name of the kind of doctor that studies internal organs like the heart and kidney?
thank you very much?

2007-11-13 11:44:19 · 4 answers · asked by Neda A 1 in Biology

Yes, I can be a total dunce when it comes to moles, but I got every other problem except these three which threw me off.
1.) Calculate the mass of calcium oxide that will be formed when 0.48g of calcium is burned in 0.32g of oxygen. The equation is:
2Ca + O2 = 2CaO (Answer: 0.67g of CaO)
2.) Calculate the mass of zinc bromide that can be formed when 1.00g of zinc is mixed with 1.00g of bromine. The equation is:
Zn + Br2 = ZnBr2 (Answer: 1.41g of ZnBr2)
3.) What mass of sodium chloride would be expected of 0.460g of sodium with 0.426g of chlorine gas? The equation is:
2Na + Cl2 = 2NaCl (Answer: 0.702g of NaCl)
The answers are the "correct" answers listed on the answer sheet by the way. So, how did we get those? Help, plz! Thanx! I'd be lost without your intelligence lol

2007-11-13 11:42:10 · 1 answers · asked by mikita_daita 1 in Chemistry

How do u find out critical points when graphing a graph. I know how to find out the vertex and zeros/roots. I need help find out critical points so the graph can be more exact. Please Help me.

Critical points are those points on a graph at which a line dran tangent to the curve is horizontal or vertical. Please help me!

2007-11-13 11:41:56 · 10 answers · asked by Ballerina 5 in Mathematics

Well im doing a project about ammonia and i cant find any where on how 3 ammonia(NH3) atoms would connect together. Would they be polar? or connected at the equator?

2007-11-13 11:41:00 · 1 answers · asked by Anonymous in Chemistry

1.Find the polynomial f(x) of degree three that has zeroes at 1, 2, and 4 such that f(0) = -16.

2.For the following equation, find the interval(s) where f(x) < 0.
f(x) = 1 Divided by x^2-2x-8

3.The polynomial f(x) divided x - 3 results in a quotient of x^2+3x-5 with a remainder of 2. Find f(3).

4.Express the following statement as a formula with the value of the constant of proportionality determined with the given conditions: w varies directly as x and inversely as the square of y. If x = 15 and y = 5, then w = 36.

5.Find the quotient and remainder of f(x) = x^4 - 2 divided by p(x) = x - 1.

2007-11-13 11:40:17 · 2 answers · asked by austin 1 in Mathematics

2007-11-13 11:38:10 · 4 answers · asked by Anonymous in Astronomy & Space

do you guys know how to convert : in Hg to kPa?
thanks

2007-11-13 11:36:55 · 1 answers · asked by `~,,..._+*-=^_^=-*+_...,,~` 2 in Chemistry

2007-11-13 11:36:26 · 3 answers · asked by Anonymous in Chemistry

I need a good link to a website to study meters for a project

2007-11-13 11:35:35 · 1 answers · asked by Anonymous in Other - Science

I'm presenting my research in a few weeks on Lightning Protection but I want to use a creative catchy title for the presentation. Does anyone have any suggestions?

2007-11-13 11:33:14 · 5 answers · asked by Anonymous in Weather

I need to make a thing that tells wind direction, some call them "weather hens" its for a project and frankly, I'm stuck.. as lame as it is.

2007-11-13 11:30:17 · 3 answers · asked by Anonymous in Weather

1. Consider the hydrocarbon pentane, C5H12 (molar mass 72.15 g).

(a) Write the balanced equation for the combustion of pentane to yield carbon dioxide and water.

(b) What volume of dry carbon dioxide, measured at 25°C and 785 mm Hg, will result from the complete combustion of 2.50 g of pentane?

(c) Under identical conditions, a sample of an unknown gas effuses into a vacuum at twice the rate that a sample of pentane gas effuses. Calculate the molar mass of the unknown gas.

2. Answer the following questions related to hydrocarbons.

(a) Determine the empirical formula of a hydrocarbon that contains 85.7 percent carbon by mass.

(b) The density of the hydrocarbon in part (a) is 2.0 g L/l at 509°C and 0.948 atm.

1. Calculate the molar mass of the hydrocarbon.

2. Determine the molecular formula of the hydrocarbon.

2007-11-13 11:30:16 · 2 answers · asked by stylinpat 2 in Chemistry

i need information!
i need the minerals that make up/are inside of the following minerals:
~pegmatite
~diorite
~basalt
~obsidian
~andesite
~rhyolite? (is there info for that?)

thank you sooo much!

2007-11-13 11:30:14 · 2 answers · asked by vballapv08 2 in Earth Sciences & Geology

a) use a magnet to attract the iron filing
b) dissolve the salt in water, then filter and evaporate
c) decant the salt
d) both(a) and (b)

2007-11-13 11:29:30 · 3 answers · asked by Anonymous in Chemistry

On moving day, a mix of small 4Kg boxes and large 8Kg baxes have to be moved. A maximum of 60 small boxes and a minimum of 40 large boxes are to be moved, and the team of movers wants to know how many boxes of each type can be moved into a container that holds no more than 600Kg.

Okay so i get:
x<=60
y>=40
x+y=600Kg

where do i go from here? do i graph it in Kg or in like numbres??? i don't know! Help me pleaase!

2007-11-13 11:28:50 · 2 answers · asked by stefany 1 in Mathematics

2007-11-13 11:28:35 · 1 answers · asked by xxiangel 2 in Chemistry

ok well my question is how did albert einstein get famous/ How did he get famous? what did he do to get famous

2007-11-13 11:26:28 · 6 answers · asked by Anonymous in Astronomy & Space

Mass percent is grams of solute over liters of solution (hydrogen peroxide)

I know i have .46 moles in .00872 liters and the density is 1.00g/ml

what is the %m/m?

2007-11-13 11:26:17 · 0 answers · asked by shirah d 2 in Chemistry

2007-11-13 11:25:29 · 7 answers · asked by Lina 1 in Astronomy & Space

solving equations by elimination mult/add

7x + 2y = -1
3x - 4y = 19

first i multiplied everything int he first equation by 3
so i now have 21x+ 6y = -3
and i multiplied everything in the second equation by 7 and got
21x - 28y = 133
then the 21x and 21x cross out
so i now have
6y = -3 and -28y = 130[add 133 and -3]
so next i subtracted 6y from -28y and got -22y = 130
now what? HELP! please!

2007-11-13 11:25:08 · 7 answers · asked by Annie 1 in Mathematics

I am a 43 year-old woman who started taking Abilify two weeks ago. I started out at 5 mg, and now am taking 10 mg. I am 140 lbs. What are the most common and marked side effects? Ever since I increased the amount from 5 to 10, my vision is blurry, blurry, blurry. Common or not? Thanks.

2007-11-13 11:23:29 · 3 answers · asked by BreadCollision 1 in Medicine

What is the equation for aluminum metal and water?

is it Al(s) +2H20(l)-->Al(OH)2(aq)+H2(g)

2007-11-13 11:19:58 · 2 answers · asked by Anonymous in Chemistry

2007-11-13 11:19:26 · 1 answers · asked by donna g 1 in Mathematics

I Need serious help on how to do longitude an latitude because I dont understand how to get the the exact answer for in between places if you know what I mean if you dont I'll Try to simplify it. If you know what Im talking about can you link me to a site or explain it to me.Please and Thank you

2007-11-13 11:19:13 · 3 answers · asked by *Mяz.ωαу* 5 in Geography

I'm trying to locate a US source of live leeches, preferably, non-medicinal. The medicinal kind are fairly expensive. The leeches are for school use, and they need to be about 2"-3" in length. A dozen or so are ideal, but if necessary, I can deal with ordering 50, if the price is reasonable. Thanks.

JbAchoo
http://journals.aol.com/sisgail/MyLifesJourney

2007-11-13 11:10:12 · 1 answers · asked by JbAchoo 6 in Biology

my daughter who is in 5th grade has this math problem . I have no clue. Here it goes: If you start with 3 and count by 7's you get the terms of the sequence 3, 10, 17,...528 where 3 is the 1st term, 10 is the 2nd term , 17 is the 3rd term, and so forth up to 528 with is the Nth term . What is the value of N?

2007-11-13 11:09:36 · 3 answers · asked by whatever 3 in Mathematics

can it be that men are those who work in more dangerous place, that they are stronger????
any lurking variables????

2007-11-13 11:05:50 · 2 answers · asked by anynomous 1 in Mathematics

ok well i dont know the acceleration, or the initial velocity. I have to find out both values. Which equations can i use?

2007-11-13 11:05:06 · 1 answers · asked by mephisto 5 in Physics

How high will an M4 bullet go? If I shoot an M4 straight up in the air, how high up will it go?

2007-11-13 11:02:59 · 2 answers · asked by Anonymous in Physics