Science & Mathematics - 24 July 2007

An atom is mostly ________???

A _______is emmitted when an electron goes from a higher energy state to a lower energy state???

_________has 8 protons, 8 electrons, and 8 neutrons???

2007-07-24 06:50:33 · 13 answers · asked by justask23 5 in Physics

2007-07-24 06:49:48 · 5 answers · asked by Anonymous in Engineering

The weights of a grapefruit follow a normal distribution. A random sample of 12 new hybrid grapfruit has a mean weight of 1.7 lb w/sample standard deviation of .24 lb. Find a 95% confidence interval for the population mean weight of hybrid grapefruit.

2007-07-24 06:49:46 · 2 answers · asked by Anonymous in Mathematics

equation : NaHSO4 =Na + H+SO4

2007-07-24 06:48:58 · 6 answers · asked by Neha B 2 in Chemistry

Online that is!

2007-07-24 06:48:14 · 5 answers · asked by Anonymous in Earth Sciences & Geology

3x+2y+z=50

I have the following information.

x>=1
y>=1
z>=1

any of x,y,z could be >=10


can we solve for x,y,z ?

please advice some steps to follow.

thank you

2007-07-24 06:45:11 · 5 answers · asked by calculus 1 in Mathematics

Why if you vaccum seal a glass tube does it not implode because i cant see how nothing can be in something . Answers will be appreciated


-baldy.waldy

2007-07-24 06:43:37 · 4 answers · asked by Anonymous in Physics

2007-07-24 06:43:24 · 3 answers · asked by mramahmedmram 3 in Mathematics

Only answer if you have a standard of reference that you can present and I can check.

2007-07-24 06:40:14 · 3 answers · asked by damo 2 in Engineering

oxalic acid- H2C2O4 • 2 H2O, MW=126.0 g/mol
-This acid has 2 replaceable acidic protons.
-what would be the normality of the acid?

2007-07-24 06:39:31 · 3 answers · asked by Anonymous in Chemistry

2007-07-24 06:39:11 · 3 answers · asked by Neha B 2 in Chemistry

2007-07-24 06:37:59 · 2 answers · asked by mramahmedmram 3 in Mathematics

2007-07-24 06:37:15 · 9 answers · asked by Anonymous in Weather

Anyone have any suggestions? Serious ones, of course. Thanks!!

2007-07-24 06:33:32 · 7 answers · asked by staci 2 in Medicine

they would have to be able to maintain structural integrity 33yards below water , or deeper, and of course be water proof. no specific price requested just the cheapest you can think of.

2007-07-24 06:33:17 · 9 answers · asked by michael n 6 in Engineering

2007-07-24 06:33:06 · 10 answers · asked by shall_i 1 in Astronomy & Space

I dont know how to work any of these.

2007-07-24 06:32:52 · 4 answers · asked by babyruth45304 2 in Mathematics

I do not even know where to begin, can someone help me?

2007-07-24 06:29:30 · 5 answers · asked by spiritmoonshine 1 in Mathematics

∫ ^2 to 1 [x^2(x^3+3)^3]

okay the first step is to find u and du and they are

u=x^3+3
du=3x^2

then find the new x numbers in the integrand so...
(1)^3+3=4
(2)^3+3=11

∫ ^11 to 4 [u^3(1/3du)]

so now am confused what do I do next

2007-07-24 06:27:56 · 5 answers · asked by clawedstar 1 in Mathematics

my bioligist teacher says the people who are overweight its not because of their genetics or because there are people in their family that are overweight. He says it has nothing to do with genetics and that it is not hereditary. I am talking to one the nurses at my job and she says that he is wrong. cand someone please clarify . thanks !

2007-07-24 06:26:29 · 6 answers · asked by Anonymous in Medicine

I'm having a hard time balancing two chemical equations...

The first is the chemical equation for the reaction that occurs between nitric acid and magnesium hydroxide. I think the unbalanced equation is : HNO3 + MgOH = MgN + H2O.

The second is for the reaction between HNO3 and PH3.

Any help balancing these equations is deeply appreciated.

2007-07-24 06:24:56 · 5 answers · asked by columbia11 2 in Chemistry

A little background knowledge on the matter prior to your responses would make it more valuable to be discussed...

2007-07-24 06:21:35 · 5 answers · asked by Neu 1 in Medicine

that perticular material even can not pass through the skin.

2007-07-24 06:19:50 · 2 answers · asked by suanjali c 1 in Physics

2007-07-24 06:17:31 · 2 answers · asked by Anonymous in Mathematics

2007-07-24 06:16:53 · 18 answers · asked by Anonymous in Astronomy & Space

A- analog meter- low resistance
B- analog meter- high resistance
C- digital meter- high resistance
D- digital meter- low resistance

2007-07-24 06:15:45 · 4 answers · asked by eric w 2 in Engineering

I wonder why alcohol can act as a fuel. When it burns. it provides energy? I am not sure. I wonder why alcohol can motivate an engine.

2007-07-24 06:14:13 · 6 answers · asked by Anonymous in Chemistry

hi frnd my doubt is abt d oil compression.
like air, is d oil can be compressed into an accumulator??
and can its b used for futher power requirements????
pls help me out, frnd..........

2007-07-24 06:12:43 · 5 answers · asked by jammu 2 in Engineering

2007-07-24 06:12:10 · 2 answers · asked by Martinez 1 in Mathematics

My classmates said that lithium could not react with water.
But if I really want it to react, can I add something to it?
Perhaps I overheard that they would add iodine......
Yet I am not sure. Suppose lithium is not reactive enough, right?/

2007-07-24 06:09:03 · 8 answers · asked by Anonymous in Chemistry