Science & Mathematics - 29 August 2007

which one of these represent a decrease in potential energy?
there is more then one answer.

A liquid freezes.
A vapor condenses.
A solid sublimes.
Positive and negative ions separate.
A chemical bond forms.
An electon absorbs a photon.

2007-08-29 10:35:32 · 1 answers · asked by huywee14 3 in Chemistry

I could answer it in my own words, although we need research. :|

2007-08-29 10:35:25 · 5 answers · asked by help me :)) 2 in Botany

2007-08-29 10:33:40 · 3 answers · asked by moradenisec4 1 in Medicine

or is it any of the other parts of speech?
thanks!

2007-08-29 10:30:14 · 4 answers · asked by sindy 2 in Botany

A worker can apply force up to 500 N in any direction.
Coefficient of friction is μ=1/3.

2007-08-29 10:27:25 · 4 answers · asked by Alexander 6 in Physics

use mathematical induction to prove that 21 divides 4^n+1 + 5^2n-1 for n=1,2,3......
Use headings base case and induction?

So letting p(n) be the proposition that 21 divides 4^n+1 + 5^2n-1
I can prove the base case is true, that is p(1), where n=1 is true since 4^2 + 5^1= 21 and clearly 21 divides 21
I am struggling with induction, that is, assuming p(k) is true, where p(k)=4^k+1 + 5^2k-1, and proving from that p(k+1)???

2007-08-29 10:25:38 · 2 answers · asked by Anonymous in Mathematics

Need to feel the blank spaces:

Uppon addition of FeSO4 to the sodium fusion solution a pale green precipitate is observed:
Fe^2+ (aq) + ................ ----> .................(s)


Thank you!

2007-08-29 10:25:22 · 1 answers · asked by miledi111 1 in Chemistry

Given the function defined by y = x + sin x for all x such that
[-pi/2, 3pi/2] for x.

(a) Find the coordinates of all maximum and minimum points on the interval. Justify your answers.

(b) Find the coordinates of all points of in
ection on the given interval. Justify your answers.

(c) Sketch the graph of the function, labeling all the points you found in (a) and (b).
i guess i can just do part c wod b easier after parts a and b

please explain
thank you!!

2007-08-29 10:21:22 · 5 answers · asked by DSS 1 in Mathematics

2007-08-29 10:19:55 · 4 answers · asked by neiltmthy 2 in Biology

What the Big Bang Theory About if You to explain in an assignment for Class

2007-08-29 10:19:01 · 5 answers · asked by Nida F 1 in Astronomy & Space

2007-08-29 10:17:47 · 14 answers · asked by i l o v e y o u ! 2 in Engineering

Lets say Humans all of a sudden left Earth and now we live in other Star Systems. What do you think the next intelligent species would be? I would say Octopus, Squid, or even an Ape.

2007-08-29 10:17:03 · 7 answers · asked by Flash 3 in Biology

2007-08-29 10:14:11 · 2 answers · asked by sachin 1 in Chemistry

They probably won't read this, but here goes:

I always put forward the Noah story to show the futility of believing the Bible explicitly. We know now that there are 10s of thousands of animal species that would need to be saved in the event of a flood that supposedly turned over the whole Earth’s crust (creationists argument for geological layers and scientists’ mis-aging of fossils).

How would Noah get all over the world to pick up a sloth and jaguar in South America, a kangaroo in Australia, a giant tortoise in the Galapogas, etc, etc, etc?

How would he get tens of thousands of species pairs into the ark?

The last time I put this to a creationist, he came back and said that all those animals were living in Noah’s vicinity at the time.

That rests the case doesn’t it?

2007-08-29 10:13:22 · 5 answers · asked by nick s 6 in Earth Sciences & Geology

This was the coldest summmer since 1911 in the US. All politics/causes aside, could this be due to global warming? Can you have seasons like this and still have a global rise in temps?

2007-08-29 10:12:17 · 3 answers · asked by Kurt W 2 in Weather

2007-08-29 10:11:33 · 21 answers · asked by notmygame 6 in Mathematics

1.deep sea methane clathrates
2.recycling of plastic containers
3.anal emissions of bovine cattle
4.the atmosphere of the moon
5.photooxidation of coal mining residues

If you find a link give it to me.

2007-08-29 10:09:18 · 4 answers · asked by Anonymous in Chemistry

Well, this may seem likr a pointless endeavor, b ut me and a couple of friends decided to try exprimentation with Hybrids, this is of course for science class. I'm looking for yes or no answeres with logical explinations attached to them.

Please answer soon.

2007-08-29 10:00:15 · 4 answers · asked by Anonymous in Botany

2007-08-29 09:58:00 · 9 answers · asked by cassiel11175 2 in Astronomy & Space

2007-08-29 09:55:54 · 2 answers · asked by Jen 1 in Zoology

2007-08-29 09:53:57 · 7 answers · asked by notmygame 6 in Mathematics

If they are the four corners of a rectangle, and why?

2007-08-29 09:53:44 · 3 answers · asked by Anonymous in Mathematics

The field just outside a 4.00 cm radius metal ball is 3.25 102 N/C and points toward the ball. What charge resides on the ball?

My work:

r=4.00 cm --> 4.0x10^-2
E=3.25x10^2

Q=(3.25x10^2)[(4.0x10^-2)^2] divided by (9x10^9)
Q=(325)(.0016)/9x10^9
Q=5.7e-11

I submitted and I am wrong? Hmmm....

2007-08-29 09:53:36 · 7 answers · asked by Jessie L 2 in Physics

WHAT iS 63+2X-7-4X

2007-08-29 09:52:26 · 7 answers · asked by PRiNCESS 1 in Mathematics

A particle's velocity is described by the function V(t)=k t^2 m/s, where k is a constant and t is in s. The particle's position at t=0 is -9m and at t=3.0s, its position is +9m. Determine the value of constant k. Be sure to include the proper unit.

2007-08-29 09:51:47 · 3 answers · asked by golffan137 3 in Physics

For example:
1.45 * 10^0 = 1.45
and
1.45 * 10^3 = 1450.

Just need to make sure im doing my chemistry homework correct. (Significant numbers)

2007-08-29 09:50:31 · 7 answers · asked by Anonymous in Mathematics

f(x)=(x^2 +16x +164 +6400x^-2 +1600x^-1)^(1/2)

2007-08-29 09:46:59 · 2 answers · asked by DSS 1 in Mathematics

My tank is 30" diameter, and 90"' long. I know that it holds 275 gal. but what I would like to do is make a stick with markings on it that would indicate 25, 50, 75, etc. . Obviously the numbers would be further apart on both ends, but by how much. Thanks.

2007-08-29 09:46:45 · 6 answers · asked by KATHERINE W 1 in Engineering

What are the usefulness of the International System of Unit to scientist?

2007-08-29 09:45:02 · 2 answers · asked by dk 6 in Other - Science

does anyone know of an animal that fits that i really really really need one. Its for school. PLEASE help

2007-08-29 09:44:54 · 7 answers · asked by x3miichelle 2 in Zoology