Science & Mathematics - 28 July 2007

Write a quadratic equation for each of the following.

1. The area of an isosceles right triangle in terms of its legs.
2. The lateral area of a right circular cylinder whose height is equal to the radius.

thanks

2007-07-28 23:47:49 · 3 answers · asked by xah8 1 in Mathematics

They have been used to study probability so I thought you maths folks would know.

You put a marble in the top and it can either fall left or right. If the marble went right it can fall right again or fall back to the centre. If, however it fell left first time it can now fall further to the left or fall back to the centre. And so it goes on.

After several layers the marbles are collected and a probability distribution can be observed.

The reason I am so interested to know is because some scientist used one to study the effect of experimentor bias on out come.

He asked subjects to will the ball to the left or right and remarkably the distribution did indeed go where they willed it to.

2007-07-28 23:36:12 · 2 answers · asked by tuthutop 2 in Mathematics

what's the most popular / common code for sending cryptic messages ....ie: A= Z, B=Y, C=X, etc.? any suggestions on a cool code to use?

2007-07-28 23:10:04 · 4 answers · asked by Smiley Bright 3 in Other - Science

2007-07-28 22:49:18 · 7 answers · asked by Anonymous in Chemistry

Thx for helping juz now... erm... sorry for the next question... Cuz i m not gd in science... but math... i m good at it... thx for helping again.. :)

2007-07-28 22:48:26 · 4 answers · asked by Anonymous in Chemistry

erm... i need it quickly... Cuz i hav a project due at wednesday and worst that today i need the ans... i am sorry if i am rude over here... (if there is :) ) thx

2007-07-28 22:40:06 · 6 answers · asked by Anonymous in Chemistry

does anyone communicate with aliens? and is able to prove it? ive heard about yawe but does anyone know how to do so?is there a specific way??can u call them? are we design to called them whenever we feel like?

2007-07-28 22:25:41 · 12 answers · asked by boricua3109 1 in Astronomy & Space

a. imaginary
b. real,irrational,unequal
c. real,rational,unequal
d. real,rational,equal

2007-07-28 22:17:13 · 7 answers · asked by Hybrid Angel 2 in Mathematics

I was just wondering if anyone knew where the 'horizontal eight' symol for infinity originate/come from? Thanks in advance!

2007-07-28 22:11:56 · 1 answers · asked by The Fine Flu 3 in Physics

2007-07-28 22:03:37 · 10 answers · asked by happytramp 4 in Astronomy & Space

Why is a sodium carbonate solution more alkaline than a sodium bicarbonate solution?

2007-07-28 22:02:48 · 2 answers · asked by Nicole J 1 in Chemistry

Is there a formula for this question? : determine how much money must be invested to produce $2120 simple interest over a period of 4 years at 7.65% p.a
thanks!

2007-07-28 22:01:52 · 5 answers · asked by little.clown 2 in Mathematics

KHC4H4O6 + NaHCO3 will yield ??
HC2H3O2 + NaHCO3 will yield ??

2007-07-28 22:00:51 · 2 answers · asked by Nicole J 1 in Chemistry

I read 2 articles about water way up in the Mesosphere (possibly cometary water)
http://findarticles.com/p/articles/mi_m1200/is_n8_v152/ai_19731995
"Reservoir of water hides high above Earth - water vapor in mesosphere"
http://www.highbeam.com/doc/1G1-20481255.html
"Water, water, way up high.(researchers find increased concentrations of water vapor in the middle layer of the atmosphere)"
How much water can the mesosphere retain before we have a disaster on our hands and it all comes crashing down on us?
If it comes down, will it release the Kinetic energy cause when it entered the atmosphere in the first place at thousands of miles a second,
OR, has that energy already been radiated back into space.

thank you for your answers

2007-07-28 21:59:15 · 6 answers · asked by barry_smith_12357 2 in Weather

a. none
b. (2,3)
c. (-2,-1,0,1,2,3)
d. (-2,-1,0,1)

Please tell me the correct answer of the choices
and if you can share your solution pls do share it...
I really nid it

2007-07-28 21:58:03 · 4 answers · asked by Hybrid Angel 2 in Mathematics

Dry-chemical fire extiguiguishers contain NaHCO3. How might powered NaHCO3 help extinguish a fire?

2007-07-28 21:56:51 · 2 answers · asked by Nicole J 1 in Chemistry

Determine the 1st derivative of g(x) = 2xe^-x2.
Find the maximum value of the function g(x) = 2xe^-x2.
Also note that e^a is always positive for all a

2007-07-28 21:53:42 · 3 answers · asked by missyvic 1 in Mathematics

2007-07-28 21:53:05 · 14 answers · asked by zeashan r 1 in Astronomy & Space

If something moves 100 feet in 4.8 seconds; how many MPH is it going

2007-07-28 21:45:26 · 6 answers · asked by Anonymous in Mathematics

Please Solve for X:
2^2x - 2^(x+1) - 8 = 0

2007-07-28 21:37:23 · 5 answers · asked by im_n0t 1 in Mathematics

Electrical

2007-07-28 21:34:28 · 6 answers · asked by A E 1 in Chemistry

2007-07-28 21:31:48 · 3 answers · asked by webin m 1 in Medicine

Iam working in a bioanalytical area i would like toknow the answer for this question.

2007-07-28 21:29:05 · 5 answers · asked by Manoj kumar 1 in Chemistry

2007-07-28 21:28:33 · 22 answers · asked by Matt B 3 in Biology

I have this rock which looks like a normal lava rock (dark red color, full of holes, like a hard sponge) and I have had this rock for about 10 years. It's been sitting in a box the entire time. I was soaking a few of my shinier stones in regular tap water and threw the above stone in as well (not sure why, just did) and it sat in the water about 5 minutes (no more than 10) and it now has this bright green moss like stuff growing out the holes! There was nothing on this rock, but this stuff literally grew within minutes. Any idea what the heck is going on? Maybe I was wrong about the type of rock? The moss-like vegetation is a super bright green, it's remarkable.

2007-07-28 21:24:16 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Could anyone please tell me how the worlds seas and oceans came to be named as they are ?....apart from the obvious geographical names such as arctic ocean etc....many thanks in advance for your answers....paul

2007-07-28 21:21:53 · 5 answers · asked by plutronman 2 in Geography

The qustion is , where is the new volume coming from?

2007-07-28 21:16:29 · 13 answers · asked by Anonymous in Astronomy & Space

We have to build a device for science which will increase the speed which an ice cube melts. The focus is radiation, conduction and convection.

2007-07-28 21:15:45 · 11 answers · asked by Anonymous in Physics

You know how people say space has no ending, but yet I believe everything thats physical, has a beginning and a end at some point in time. Yes I am a Christian and believe in god, but you know how god was always here (no beginning), I mean if you take gods lifetime so far back, I sure that there was a beginning, now it may of been a long time ago. Do you think there is another place after you have gone so far in space, just like you go so far in earth, and end up in space.

2007-07-28 21:13:06 · 13 answers · asked by Anonymous in Astronomy & Space

I just wondering if this is possible.

2007-07-28 21:12:14 · 5 answers · asked by Viz 2 in Engineering