Science & Mathematics - 24 November 2007

Lithium bromide crystallizes with a NaCl type structure. What is the total number of ions (positive and negative) in the unit cell?
I have 8... but I'm not sure... any help would be great. Thanks!

2007-11-24 16:35:22 · 2 answers · asked by ¿ /\/ 馬 ? 7 in Chemistry

2007-11-24 16:29:49 · 1 answers · asked by Anonymous in Physics

Thanks alot

2007-11-24 16:23:49 · 18 answers · asked by Anonymous in Biology

explain

2007-11-24 16:22:56 · 6 answers · asked by Anonymous in Mathematics

does anyone know its formula for the final temperature?

2007-11-24 16:18:40 · 3 answers · asked by Anonymous in Physics

explain!

2007-11-24 16:16:37 · 3 answers · asked by Anonymous in Mathematics

How could this be possible because there are many natural forces that could destroy these prints such as meteorites,dust from the landing and launching of the appolo etc .Or is nasa making a fool of us.

2007-11-24 16:14:26 · 13 answers · asked by abhi 1 in Astronomy & Space

2007-11-24 16:14:12 · 5 answers · asked by Wait a Minute 4 in Other - Alternative

As far as Air Quality please. I'm trying to come up with many hypothesis and conclusion to why L.A. is ranked # 1 in air pollution.

2007-11-24 16:05:51 · 6 answers · asked by grrrrrl1978 2 in Geography

The active element of a certain laser is an ordinary glass rod 16 cm long and 0.7 cm in diameter. If the temperature of the rod increases by 77°C.
(a) Find its increase in length.
________cm
(b) Find its increase in diameter.
________cm
(c) Find its increase in volume.
________cm3

2007-11-24 15:53:22 · 1 answers · asked by Anonymous in Physics

2007-11-24 15:49:43 · 3 answers · asked by Anonymous in Biology

What happens when you apply the power rule for integration to the function 1/x?

2007-11-24 15:49:36 · 2 answers · asked by gigichic21 1 in Mathematics

7(cos3pie/2 +i sin 3pie/2)

2007-11-24 15:48:17 · 2 answers · asked by danahen2000 1 in Mathematics

Zoology Degree of Biology Degree with Animal Emphasis?

I want to be a zoo keeper. The director of the zoo near me said some zoo keepers go for a degree in zoology, and some go for degrees in biology with an animal emphasis, to name just two.

What does each degree specifically cover? I need to know which degree I should look into further...

2007-11-24 15:47:23 · 4 answers · asked by DanceTeacher 2 in Zoology

What other things could it be spent on? Why are they better?

I've already come up with a small list but would love to see what you huys come up with.

2007-11-24 15:45:55 · 16 answers · asked by Ruddo S 2 in Astronomy & Space

2007-11-24 15:44:13 · 3 answers · asked by bigblue 2 in Physics

does anyone know if someone has ever built a practical solar powered wheelchair? i imagine the issue with building one is the expense and heavy glass solar panels.

2007-11-24 15:38:00 · 3 answers · asked by PDF 2 in Engineering

(dueterium) water....what about Superheavywater? (tritium) water?

2007-11-24 15:37:12 · 7 answers · asked by Anonymous in Other - Science

A Gaussian integer is a complex number of the form a+bi where, a,b are integers and i = squareroot -1. Show set of Gaussian integers is denumberable


Any help would be great...thanks

2007-11-24 15:36:26 · 3 answers · asked by nowimpsbball 1 in Mathematics

A. is a virus that is non pathogenic
B. is an elongated viral particle
C. can transfer recombinant DNA to other viruses
D. will not produce an immune response
E. is made with antisense DNA

2007-11-24 15:35:15 · 2 answers · asked by l2ikki 2 in Biology

can finite element method be used to solve problems with multiple dimensions if we know the properties of each element such as the strain and stress relationships of each element to each other and the fluid and electromegatic flows in and out each elements by what comes in must go out principle? i can see that FEM would have applications from architecture, virtual reality (computer art) to structural, mechanical and electrical engineering and even medical imaging applications (things which we can see and can't see)?

2007-11-24 15:32:02 · 3 answers · asked by Anonymous in Engineering

im doing an experiment on cathodic protection and i want to know if it will work if i use a 9 votl battery and two nails conntected to each side of the battery.look at this picture:
http://www.terrific-scientific.co.uk/Topics/Corrosion/4-Ex4result.htm

2007-11-24 15:22:54 · 2 answers · asked by Speeding D 4 in Engineering

can I then say that the function is not differentiable at that point?

2007-11-24 15:20:24 · 2 answers · asked by q_midori 4 in Mathematics

Is there a stationary telescope that I can buy that can be controlled through my PC wirelessly to autofocus on an object while I view it on my monitor? Also is there such a telescope that can filter out background light from street lights and give a fairly clear view of planets and galaxies at night? What's the price range? I want one that I can set up outside anywhere and adjust it from in doors at my PC. Thank you.

2007-11-24 15:19:08 · 7 answers · asked by Anonymous in Astronomy & Space

Which one of the following applies:
a) Heisenberg uncertainty principle
b) Pauli exclusion principle
c) Hund's rule (principle of maximum multiplicity)
d) Shielding effect
e) Wave nature of matter

1. Can be used to predict that a gaseous carbon atom in its ground state is paramagnetic
2. Explains the experimental phenomenon of electron diffraction
3. Indicates that an atomic orbital can hold no more than 2 electrons
4. Predicts that it is impossible to determine simultaneously the exact position and velocity of an electron

2007-11-24 15:14:50 · 3 answers · asked by missingfeet 2 in Chemistry

2007-11-24 15:13:34 · 3 answers · asked by danmak2001 1 in Engineering

2007-11-24 15:05:32 · 9 answers · asked by Orange? 4 in Biology

Let a and b be nonidentity elements of different orders in a group G of order 155. Prove that the only subgroup of G htat contains a and b is G itself.

Well since the only divisors of 155 are 31 and 5, then the orders of a and b have to be 31 and 5. (Or 155 and 1 I suppose.) My proof looks like this, but it needs patching up:

Let H be a subgroup of G, and a, b elements of H. To show H = G:
H is a subset of G because it is a subgroup of G.
To show G is a subset of H:
|a| divides |H| and |b| divides |H|
31 divides |H| and 5 divides |H|
|H| = y*155 because the least common multiple of 31 and 5 is 155.
Therefore |G| divides |H|.
Therefore G is a subset of H.

Can someone help make this look nicer? I have a feeling there are a lot of holes in this proof. Thanks!!!

2007-11-24 15:02:56 · 1 answers · asked by Anonymous in Mathematics

if a sophomore is taking algebra II and the school doesn't require a pre-calc. class as a prerequisite, should they go ahead and sign up for AP calc. AB for junior year so that they'd be able to take calc. BC their senior year if they did well??

2007-11-24 15:00:36 · 2 answers · asked by Matt 1 in Mathematics

My 13 yr old daughter is working on a project for school. Is there a site that has a list of everyday materials that go with the periodic table? Ex. copper=penny, lead=fishing weight, ect

2007-11-24 14:57:50 · 2 answers · asked by Rod B 1 in Chemistry