Science & Mathematics - 18 December 2007

I need website where they would tell me what caused the population changes from 1800 to 2000. please

2007-12-18 12:27:49 · 2 answers · asked by lost_empty_promises 1 in Geography

We trained planaria the always turn left in a maze.

Are these the Controlled variables, or is it unnecessary information?:
-all planaria were given the same task to learn
-leads were stimulating each planaria for the same length of time, and were held at the same distance ((we shocked them with leads and a battery))
-all planaria used the same T-Maze
-planaria started the maze at the same spot
-were shocked at first sign of a right turn

Did I miss anything, or added something useless?

2007-12-18 12:27:00 · 2 answers · asked by C'est Comme Un Rêve 3 in Biology

Solve for K. Thanks for the help!

[h-2 5 ] [-3] = [2h-4]
[4 2+2k ] [4 ] [5k=10]

2007-12-18 12:23:13 · 2 answers · asked by Anonymous in Mathematics

x^2-kx+36=0 can you explain what this means?

and...


for what real values of k do each of the following quadratic equations have 2 real and distinct roots? kx^2+x+1=0

2007-12-18 12:20:36 · 3 answers · asked by Caramel 1 in Mathematics

ei plz..kindly answer this..i really need that for my report..tnx..

2007-12-18 12:19:06 · 4 answers · asked by caloonpop_07 1 in Zoology

"A 10m wire is hung from a high ceiling and held tightly below by a large mass. Standing waves are created in the wire by air currents that mass over the wire, setting it in motion. If the speed of the standing wave is 335 m/s and its frequency is 67 Hz, what is its wavelength?"
I know Wavelength= Velocity divided by Frequency, but the 10m wire is messing me up. Is that unneeded information to throw me off, or how do I put it into the equation to get a correct answer. I am thinking it is 335/67, but I'm not sure, and this is for a quiz grade.
If you could explain how to do it, that would be lovely. :]
Thanks

2007-12-18 12:19:03 · 1 answers · asked by Anonymous in Physics

carbon hydrogen oxygen please help!! lab science work do not know.

2007-12-18 12:17:16 · 2 answers · asked by z 2 in Chemistry

whats the difference ?
name atleast five or as many as you can think of :]

state your source

2007-12-18 12:16:55 · 4 answers · asked by Anonymous in Physics

how are sheep related to a south american desert???

2007-12-18 12:16:36 · 5 answers · asked by Anonymous in Zoology

I know you can use a digital camera to see them but i need something along the lines of goggles or something.

2007-12-18 12:15:34 · 4 answers · asked by Anonymous in Other - Science

Please help? jus answer the ones that you know, thanks.

1) What is the number of possible isomers for C4H8 ?
a) 6 b) 3 c) 5 d) 2
2) 1,1,2-trimethylcyclopentane is an isomer of which
compound? -a) nonane, b) isoheptane,
c) 2-isopropyl-pentane, d) isohexane
3) Which compound can react with chlorine gas to produce
1,2-dichlorocyclohexane? -a) hexane b) cyclohexene
c) 3-methylcyclohexane d) 2-methylhexane
4. When ethane is converted to ethylene, the carbon atoms:
a) are oxidized b) are reduced
c) act as oxidizers d) are unchanged
5. What is the bond angle between H-C-C in acetylene?
a) 180 b) 90 c) 109 d) 120
6. A benzene compound with a bromine in the 1 and 3
positions has the common name of:
a) o-dibromobenzene b) p-dibromobenzene
c) m-dibromobenzene d) dibromobenzene

2007-12-18 12:14:24 · 5 answers · asked by Anonymous in Chemistry

ok so what is that charts name that you need to be able to see if one element is able to replace another... if you dont know the name could i just have the list

2007-12-18 12:14:07 · 4 answers · asked by Anonymous in Chemistry

2007-12-18 12:11:47 · 16 answers · asked by Beatrice Antinori 1 in Medicine

2007-12-18 12:10:19 · 3 answers · asked by scurvyirvy 2 in Mathematics

2007-12-18 12:10:05 · 3 answers · asked by zorenid r 1 in Zoology

the nurse takes 4 min. to take temp. etc. she waits another 17 min. for dr. what time does Dr. come in?

2007-12-18 12:10:02 · 3 answers · asked by latesleeper17 1 in Mathematics

please answer these.

1 how do sponges and cnidarians get food?

2 wat r 3 common things of flatworms and roundworms?

3 compare the body plan of a flatworm to a roundworm.

4 y would spongin and spicules discourage preatitors from eating sponges?

5 some sponges and cnidarians reproduce asexually. why is this beneficial to them?

thank you

love,
person who wrote this on his wii

2007-12-18 12:09:32 · 1 answers · asked by popstam 4 in Biology

Please classify them


Ba(CN)2 = H2SO4 ---> BaSO4 + HCN


Al + CuSO4 --->Al2(SO4)3 + Cu

2007-12-18 12:08:35 · 2 answers · asked by Istis 3 in Chemistry

2007-12-18 12:07:49 · 10 answers · asked by fpmessenger5 1 in Zoology

2007-12-18 12:07:35 · 9 answers · asked by Anonymous in Astronomy & Space

I know that there are pretty simple ways to solve these problems (there always are with these type of assignments) but I really can't figure them out. I have the following image: http://www.eggloaf.com/coaster.PNG
And I am supposed to calculate the minimum value of h such that the cart can stay on the top of the loop without falling off of the track (friction is negligible). I've tried just about every formula I can think of, but I can't come up with a numeric answer...
Also, it asks to calculate the normal force as a function of theta from 0 to 180 degrees, where theta is the angle formed between the bottom of the loop and the position of the cart. I don't even know where to begin with this one...

Honestly, any help at all would be really appreciated.

2007-12-18 12:05:49 · 3 answers · asked by Beeflog 1 in Physics

In the study of immunology how are the use of mathematics used? Specifically polynomials and radicals?

2007-12-18 12:05:24 · 1 answers · asked by R W 1 in Mathematics

2007-12-18 12:04:19 · 48 answers · asked by Anonymous in Mathematics

Question 1:
Brightly colored red gills in a fish indicate the presence of _________.

Question 2:
The body temperature of a fish is like that of the water it lives in. It is therefore considered a ______-blooded animal.

Question 3:
________ are the organs of locomotion in a fish.

Question 4:
The lateral line, a series of nerve cells, aids the fish to ________ itself in the water.

Question 5:
The webbed hind feet of a frog are adaptations for _________.

Question 6:
Adult frogs breathe by means of lungs and _______.

Question 7:
Thin tissues holding the digestive organs in place in the abdominal cavity are called ____________.

Question 8:
the young water-living, fish-like baby frog is called a ___________.

Question 9:
Frogs go into an inactive period in the mud during the winter months. This condition is known as ___________.

Question 10:
The scales on the underside of a snake uses for locomotion are known as ____

A. mesenteries
B. cold
C. swimming
D. skin
E. balance
F. scutes
G. lungs
H. fins
I. chameleons
J. hibernation
K. four
L shell
M. tadpole
N. oxygen
O. fangs

2007-12-18 12:02:33 · 1 answers · asked by Anonymous in Zoology

x cubed minus 8.....in other words
x3-8
^ it means x cubed
I cannot factor the equation!!!! plz help!!!

2007-12-18 12:01:37 · 5 answers · asked by anicento@sbcglobal.net 1 in Mathematics

I have to build this neon atom for Chemistry and I dont have any idea how to start it. I know I'm using Christmas bulbs for it though. Can anyone explaine to me how to do this, or where on the internet I can look for help???PLEASE

2007-12-18 12:01:04 · 1 answers · asked by Anonymous in Chemistry

the combined form of chlorine is ClSO4,ClO and the Magnesium is MgO and MgSO4..plz answer

2007-12-18 11:57:14 · 1 answers · asked by Anonymous in Chemistry

I've notived more sunlight in the afternoon for over a week. It is after 5:30 before the wan in lioght becomes more noticeable and almost 6pm before it is actually dark.

2007-12-18 11:50:32 · 9 answers · asked by jeandou 1 in Astronomy & Space

2007-12-18 11:47:06 · 9 answers · asked by Anonymous in Zoology

In my investigation I am measuring the affect of increasing heights (by a metre each time) on the distance/dispersal of maple seeds ('Helicopters/whirlybirds... The distance they traveled being recorded using centimetres and millimetres.
Once all the distances have been measured I calculate the average or mean distance that the seeds traveled, in cm and mm, at that paticular height. The expected results are; that as the height increases that the seeds are dropped from, the further they will travel (all other variables controlled)
I need a test to analyse my data, but I'm stumped as to which one to use? I currently going with Chi-squared... but is this correct? Should I use something like standard deviation?
Any advice is greatly appreciated!

2007-12-18 11:39:55 · 1 answers · asked by Anonymous in Other - Science