Science & Mathematics - 5 December 2007

true or false

2007-12-05 08:57:23 · 4 answers · asked by DeeDee 1 in Chemistry

if you were abducted by aliens and made into their slave for their interglatic slave trade(just my imagination at work) what would you do?

2007-12-05 08:57:15 · 8 answers · asked by Anonymous in Astronomy & Space

Vehicles which run on fuel cell technology are currently being developed. These vehicles are quiet and efficient and make use of two plentiful elements - hydrogen and oxygen.

Fuel cells generate energy to power the vehicle by combining hydrogen gas (H2) and oxygen gas (O2) to form water (H2O) as shown in the following chemical equation.
2 H2+O2 ==> 2 H2O

If a fuel cell-powered vehicle can hold a maximum of 5 kg of water (i.e., the product), what is the maximum total amount of hydrogen and oxygen gas that should be used as reactants?


So if anyone could help, it'd be much appreciated.
If you can make me understand it, when I can, I'll give you the 10 points.
:3

2007-12-05 08:56:17 · 4 answers · asked by Blackberries. 2 in Chemistry

AAA
BBB
CCC
DDD
EEE
FFF
GGG
HHH
III
JJJ
KKK
LLL
MMM
NNN
OOO
PPP
QQQ
RRR
SSS
TTT
UUU
VVV
WWW
XXX
YYY
ZZZ

Did you know that 80% of UCSD students could not find the error above?

2007-12-05 08:53:59 · 7 answers · asked by Anonymous in Geography

m/3 + 2m/3

2007-12-05 08:45:32 · 9 answers · asked by Anonymous in Mathematics

Algebra division of Polynomials. Need Help Please.

2007-12-05 08:45:25 · 2 answers · asked by tianna_85902 1 in Mathematics

2007-12-05 08:43:56 · 2 answers · asked by Anonymous in Mathematics

Today in my crap newspaper, for reasons other than this viewpoint, there was a publiushed view that spouted trash about evolution. The main "areguments" of this viewpoint were

1-we have so many people delighted to come from pond scum
We accept the fact that evolution accuretly and correct describes, how we came about. Simply because we do not want to think something happened, does not mean it did not happen. As much as Americans would like to forget about slavery, the fact is it happened and wishing for it not to happen, does not make it any less real.
2-Evolution does not answer what "power/force/agency allthe nessicary changes take place to make all this happen"
Ironically some1 wrote a letter descibing the hunting of deer and talked about passing on of traits in the very same issue.
3-Evolution is just a theory
4-Wait until you have a prayer answered, and see God's power
5-Everything is a result of a Intelligent designer

2007-12-05 08:43:34 · 8 answers · asked by MyNameAShadi 5 in Biology

I'm looking into either psychiatry or clinical psychology, and I've always ahd this dream of becoming an astronaut. is it possible? What has there been in the past?

2007-12-05 08:41:28 · 7 answers · asked by natalia j 2 in Astronomy & Space

An observant fan at a baseball game notices that the radio commentators have lowered a microphone from their booth to just a few inches above the ground, as shown in the figure below. The microphone is used to pick up sound from the field and from the fans. The fan also notices that the microphone is slowly swinging back and forth like a simple pendulum. Using her digital watch, she finds that 10 complete oscillations take 81.0 s. How high above the field is the radio booth?

2007-12-05 08:41:03 · 2 answers · asked by symia87 1 in Physics

2007-12-05 08:40:45 · 2 answers · asked by Nick 4 in Mathematics

is there a scientific explanation for this?

2007-12-05 08:39:01 · 11 answers · asked by andreff123 2 in Biology

What are the characteristics that make the average forest "old-growth"?

2007-12-05 08:38:49 · 2 answers · asked by Jeremy W 2 in Botany

what is -7<3-2x<13

2007-12-05 08:38:16 · 3 answers · asked by Brittney M 1 in Mathematics

2007-12-05 08:38:03 · 3 answers · asked by Panther 3 in Mathematics

The single cable supporting an unoccupied elevator breaks when the elevator is at rest at the top of a 154 m high building. With what speed does the elevator hit the ground? How long does it take to fall?

2007-12-05 08:36:59 · 2 answers · asked by Lisa 2 in Physics

The angular position of a point on the rim of a rotating wheel is given by θ = 4.24t - 2.17t2 + 3.51t3, where θ is in radians and t is in seconds. What are the angular velocities at (a) t = 1.09 s and (b) t = 6.17 s? (c) What is the average angular acceleration for the time interval that begins at t = 1.09 s and ends at t = 6.17 s? What are the instantaneous angular accelerations at (d) the beginning and (e) the end of this time interval?

2007-12-05 08:36:35 · 3 answers · asked by shade o 1 in Physics

how do i make a parachute?
it can't be made out of a bag.
do you have any ideas....
please list websites too.
i can't figure out any other options.

2007-12-05 08:35:50 · 2 answers · asked by Ashley 3 in Physics

2007-12-05 08:34:15 · 0 answers · asked by Anonymous in Earth Sciences & Geology

How many grams of phosphorus react with 55.2 L O2 at STP to form tetraphosphorus decaoxide?
P4(s) + 5O2(g) → P4O10(s)

2007-12-05 08:32:44 · 1 answers · asked by Anonymous in Chemistry

because it is an improper fraction

2007-12-05 08:32:39 · 25 answers · asked by chey m 1 in Mathematics

11 + 8p = 9p

-11
8
-6
11

The value of 8 dimes is 10 8 = 80 cents. Likewise, the value of x dimes is 10x. If George finds nickels, 3x dimes, and x quarters in his change jar, express the total value of change in cents as an algebraic expression.

(60x - 10) cents
(85x - 2) cents
(85x + 10) cents
(85x - 10) cents

6(x + 5) - (6x + 30) = 0

0
5
all real numbers
no solution

Identify the numerical coefficient of the term.
zy2

1
0
z
-1

2007-12-05 08:31:54 · 7 answers · asked by Anonymous in Mathematics

Oh man, I had a test today and I didn't know how to do this, it was a bonus mark because we didn't learn it.

How do you show increasing acceleration (not constant) on a distance-time graph?
Is it curve, if so what kind?

2007-12-05 08:31:52 · 4 answers · asked by funkee_fresh721 2 in Physics

i have a question asking me to draw a picture of a textbook on a table and label all the forces acting on it, we are on like mass and inertia but i dont understand what other forces would be acting on the book other than gravity

2007-12-05 08:31:22 · 2 answers · asked by molly 1 in Physics

Passed away civilisations in the outer space also has had a convex gasshield that like a parabola delivered the toughts into billions of parcecs away, different distances, different times ago. It takes time continusly as long as they did exists.
Receiving brought the human mind onto existent level.
Also, the human civilization's higher attempts will be used by hundreds of millions, if billions of yrs later -by then forming intelligent life.
Physical contact is impossible with them, either fourth, or back in time.

2007-12-05 08:30:31 · 6 answers · asked by Anonymous in Astronomy & Space

What is the mass of a 364.0 mL sample of ammonia gas at 10.6oC and 144.76 kPa?

2007-12-05 08:27:48 · 1 answers · asked by Anonymous in Chemistry

2007-12-05 08:25:17 · 5 answers · asked by Anonymous in Mathematics

A car traveled 1.00 hr at 60 km/hr and 0.30 hr at 40 km/hr. What was the car's average speed over the entire trip?

2007-12-05 08:25:04 · 1 answers · asked by Sarah P 1 in Physics

starting with the far left carbon as one.

CH2CCHCH3

What is the molecular shape of carbon 3?

1. Bipyramidal

2. Square Planar

3. Trigonal Pyramidal

4. Tetrahedral

5. Linear

6. Trigonal Planar

7. Angular

2007-12-05 08:19:52 · 1 answers · asked by pocketdictionary 1 in Chemistry

Give 3 examples

2007-12-05 08:18:27 · 4 answers · asked by Anonymous in Biology