Science & Mathematics - 17 November 2007

I need some explanation about Changes in the lithosphere for my report. If someone know a site that explains the Changes in the lithosphere please post it here.

2007-11-17 20:55:05 · 2 answers · asked by cathrene.katze 1 in Earth Sciences & Geology

I ask this question because sooner or later the earth and its resources will become insufficient and depleted and we will have to look for other alternative measures in dealing with expansion and growth. So, if we started to live on mars, would things like 'religion' go straight out of the window , allowing people from all walks of life to simply 'get along?'

2007-11-17 20:32:13 · 4 answers · asked by Anonymous in Astronomy & Space

why do human beings blink so much after our heads have been cut off?

2007-11-17 20:31:47 · 3 answers · asked by Jerry L 1 in Biology

2007-11-17 20:31:36 · 5 answers · asked by Muammar A 1 in Chemistry

2007-11-17 20:30:32 · 9 answers · asked by Mercury 2010 7 in Astronomy & Space

ans. only

2007-11-17 20:20:40 · 3 answers · asked by Angelica 1 in Medicine

How would you work this problem? And what would the fraction answer be for x?

2007-11-17 20:15:58 · 7 answers · asked by Jeremy B 2 in Mathematics

H2 + Cl2 >>> 2 HCl

Could someone please show me how to answer the question in full steps. This is seriously confusing. (TIA)

2007-11-17 20:08:05 · 1 answers · asked by xxxladyxxx 1 in Chemistry

2007-11-17 20:01:49 · 7 answers · asked by Inou 3 in Astronomy & Space

A work W0 is required to stretch a certain spring 2 cm from its equilibrium position.
Suppose the spring is already stretched 2 cm from equilibrium. How much additional work (in terms of W0) is required to stretch it to 3 cm from equilibrium?

2007-11-17 19:53:26 · 2 answers · asked by p0oh 1 in Physics

It takes 115 J of work to compress a certain spring 0.12 m.
(a) What is the force constant of this spring?
correct check mark kN/m
(b) To compress the spring an additional 0.12 m,
Calculate the work required to compress the spring this additional amount

2007-11-17 19:51:47 · 1 answers · asked by p0oh 1 in Physics

I have 2 quick problems that I need some assistance solving!

1. What is the corresponding wavelength of a neutron traveling at 4.56 x 10^4 m/s, whose mass is 1.00866 amu.

-The main part giving me trouble on this is how I should convert amu into a functional unit for the formula to solve for wavelength.

2. List the following in decreasing order of size: Ca, Ti4+, Sc3+
-I understand that atoms and ions grow larger through the periodic table as they move down and left, but am unsure when an electron moves from a charged state to a noble gas version.


Thanks in advance!

2007-11-17 19:45:38 · 3 answers · asked by Justin M 1 in Chemistry

Explain why nuclear fusion takes place only in the centers of stars rather than on their surface as well. What is the major fusion process that takes place in the Sun?

2007-11-17 19:41:13 · 4 answers · asked by Anonymous in Astronomy & Space

Hello,

I was wondering how one would solve a trigonometric equation such as the following:

cos x = sin 2x, (0 =< x =< 2pi)

For this equation, I ended up with:

sin x = 1/2,
x = pi/6, 5pi/6

However, the answers supplied with the question have 5 answers, 0, pi, 2pi, pi/6 and 5pi/6. How do I get the additional 3 answers?

Same goes for the next one:

sin 2x = sqrt(3) cos x, (0 =< x =< 2pi)

I end up with:
sin x = [sqrt(3)]/2
x = pi/3, 2pi/3

The answers are pi/3, pi/2, 2pi/3, 3pi/2

Thank you very much.

2007-11-17 19:39:18 · 2 answers · asked by w_gy_cc 2 in Mathematics

consider the points A(0,2), B(-6,4) and the line L1 with equation 3y-x-12=0.
1) Find the equation of the circle C whose center is the point of intersection of the line L1,and the segment AB, and whose diameter is equal to the length of the segment AB

2007-11-17 19:34:14 · 2 answers · asked by Anonymous in Mathematics

I am going for medicine in a few years time, 2009, if i have a chance.
Can you tell me a bit about a doctor's life? :)

2007-11-17 19:26:10 · 6 answers · asked by Anonymous in Medicine

2007-11-17 19:24:35 · 12 answers · asked by Anonymous in Biology

i need it for my investigatory project. anyone please help. how do i make a filter? just a simple one for pollution in the air.

2007-11-17 19:22:48 · 4 answers · asked by Anonymous in Chemistry

i'm trying to find the name of a butterfly i saw on animal planet's the most extreme. i think its from spain and its the only butterfly that actually sucks blood (dead blood). i think it looks like this, http://i12.photobucket.com/albums/a224/lita2016/top_pic1.jpg
i dont remember but i'm trying to find the name of the butterfly and another picture of it because this is the only one i found

2007-11-17 19:06:27 · 5 answers · asked by Melissa 1 in Zoology

a certain gas at 101.325 kpa and 16deg C whoose volume is 2.83m^3 are compressed into a storage vessel of .31 m^3. Before admission, the storage vessel contained the gas at a pressure and temperature of 137.8kpa and 24degrees Celcius. After the admission, the pressure has increased to 1171.8 kpa.What should be the final temperature of the gas in the vessel in kelvin?

2007-11-17 19:06:12 · 1 answers · asked by J-weak 2 in Physics

1. Traveling downstream, a boat can go 18 km in 2 hrs. Going upstream, it makes only 2/3 this distance in twice the time. What is the rate of the boat in still water, and what is the rate of the current??

2. A river streamer travels 48 km downstream in the same time that it travels 32 km upstream. The streamer's engines drive in still water at a rate which is 16 kph greater than the rate of the current. Find the rate of the current.


pls. show your solution. pls. answer it i need it now, pls. i'm begging you pls. pls. pls.

2007-11-17 19:02:18 · 0 answers · asked by Anonymous in Mathematics

In the morning of Japan sometimes you can hear a bug buzzing as if it were the wake up call like a rooster here in the US. Is it some kind of beetle?

2007-11-17 18:59:46 · 3 answers · asked by Questions 1 in Zoology

*tell me a website i can go to if u found an answer there

2007-11-17 18:49:37 · 1 answers · asked by Anonymous in Chemistry

1. Linda put $800 in a regular savings account and $1000 in a special account. In one year she earned $120 in interest. Her brother invested $1000 in the regular account. He earned $144 in interest. What are the interest rates on each type of savings account?

2. A tank can be filled by letting pipe A run for 3 hours and pipe B run for 2 hours, or by letting pipe A run for 2 hours and pipe B for 4 hours. How long does it take each pipe running alone to fill the tank?



Pls. answer it i need it right now pls. i'm begging you pls. pls. pls.

2007-11-17 18:48:13 · 5 answers · asked by Anonymous in Mathematics

I've been reading about the ocean segment of the carbon cycle... particularly about how the burning of fossil fuels and resulting CO2 on ocean water acidity affects the ocean's effectiveness as a carbon sink. Carbon dioxide, carbonic acid, bicarbonate, and carbonate ions interact with limestone and calcium carbonate in the ocean -- particularly dissolving calcium carbonate shells of mollusks... especially the planktonic ones.

It brings to mind soft-drinks and increased risk of bone fractures... I wonder if they are linked in some way. Anybody have some information? I haven't been able to find related info on the web. Thanks!

2007-11-17 18:44:46 · 2 answers · asked by Anonymous in Chemistry

in a box, there are 6 red balls and 7 blue balls.Two blue balls are drawn in the first and second draw. assuming the balls are not returned, what is the probability of getting at least 2 red balls in the next three draws?

2007-11-17 18:43:39 · 9 answers · asked by J-weak 2 in Mathematics

First, if i have an engine with 6.5 horsepower at 3600 rpm, the torque is measured from the outside of the crankshaft of diameter 3/4", right? so if i put a sprocket on to drive a chain i have to divide my torque of 9.48 ft-lbs by the ratio between 3/4 and the diameter of the sprocket? does this affect horsepower AND torque or does the hp stay the same due to the increased linear speed?

Also, if i am supplying a certain amount of torque and hp to the rear drive sprocket, how do i figure out how much "thrust" i am supplying to the ground, say if its 40 ft-lbs on the sprocket and the wheel is 2 times bigger, do i divide 40 ft-lbs by 2 and get 40 pounds force, or what?

Ive been trying to figure this out for awhile so the more detailed the better, thanks.

2007-11-17 18:37:14 · 1 answers · asked by Jesse C 1 in Engineering

In math class, I am currently learning about Sine, Cosine, Tangent, Cosecant, Secant, and Cotangent. We have also just started a lesson on the unit circle. I have all the coordinates for the Unit Circle all plotted out for 30, 45, 60, 90, 120, 135, 150, 180, 210, 225, 240, 270, 300, 315, 330, and 360 degrees.

How do I find the Sin of 30 degrees? How do I find the Cosine of 30 degrees? How do I find the tangent of 30 degrees? The points for 30 degrees are, (square root of 3 divided by 2, 1/2).

Here is a link to the unit circle that I found on the internet:
http://hrsbstaff.ednet.ns.ca/eplee/images/Unit%20Circle.jpg

2007-11-17 18:36:24 · 4 answers · asked by middleeastconflict 2 in Mathematics

I know the rxn
4NH3 + 5O2 -> 4NO + 6H2O

but does anyone have maybe a scanned img of the mechanism or a detailed explanation.

I started to say oxgen elections grab a pt2+ and then resonate to a + charge on the oxygen without the pt on it then the nitrogen free elections grab the positively charge oxygen and then oxygen electrons from another O2 grab off and H and the electrons go onto the N and stabalize it but from there im lost. thanks for the help

yes, I could have saved some lines and said oxidation of ammonia but it means the same thing as what I said in the description. I am doing a powerpoint presentation with this rxn and this will be more indepth rather than just showing "it is bc it is"

2007-11-17 18:35:08 · 2 answers · asked by thatoneguy 2 in Chemistry

2007-11-17 18:30:29 · 6 answers · asked by robert 3 in Biology