Science & Mathematics - 17 October 2007

To begin with where did all the matter come from?

2007-10-17 23:58:27 · 13 answers · asked by Cally 3 in Astronomy & Space

2007-10-17 23:55:56 · 5 answers · asked by abed ulwahab t 1 in Mathematics

2007-10-17 23:47:15 · 3 answers · asked by jerry till 1 in Mathematics

2007-10-17 23:46:56 · 3 answers · asked by chaitra d 1 in Mathematics

For example ,KUWAIT and LEBANON are mostly the same area .But LEBANON is mountanous and KUWAIT is flat desert.Do we calculate the surface of the slopes of mountains or we only calculate the outside boundaries .

2007-10-17 23:46:23 · 2 answers · asked by mrou頳 1 in Geography

sq rt ( 5u+10) = sq rt(9u+7)


solve for u


THANKS! =)

2007-10-17 23:42:09 · 8 answers · asked by MTak 2 in Mathematics

Function y=x^2 e^-x, how to find growth and decrease intervals when function is y=x^2 e^-x?
Thank you

2007-10-17 23:41:07 · 1 answers · asked by aurelijad 1 in Mathematics

Seems like the 2nd one is always about 90 mins later

2007-10-17 23:33:57 · 4 answers · asked by Kelly666 2 in Astronomy & Space

4y^2+5=12y


solve for y, thanks!

2007-10-17 23:26:39 · 11 answers · asked by MTak 2 in Mathematics

How do I go about solving these questions?

Solve:

Question 1:
4x^2 – 28x + 40 = 0

Question 2:
12y^2 + 35y + 25 = 0

Question 3:
x(x – 2) = 8

Question 4:
45n^2 + 21n = 0

2007-10-17 23:24:07 · 3 answers · asked by Anonymous in Mathematics

i Thought it was a planet. it was on it's own, no moon or other stars...

2007-10-17 23:21:41 · 13 answers · asked by Az 1 in Astronomy & Space

Let f(x)= 2x2-x+1 (2x is squared)

Find the difference quotient f(x+h) - f(x) / h , for each function

2007-10-17 23:19:38 · 2 answers · asked by Anonymous in Mathematics

2007-10-17 23:09:29 · 8 answers · asked by kevin_bourke2000 1 in Zoology

2007-10-17 23:08:54 · 2 answers · asked by Anonymous in Physics

i tried doing these problems but my teacher said i got them wrong and to re do them.. can someone help?

a stone is dropped from a cliff. after it has fallen 40 m, what is the stone's velocity?


and also

what is the average acceleration of a car tha tgoes from rest to 59 km/h in 9.0 seconds?



and the last one


a ball is thrown up with a velocity of 60 m/s
at what time will it have a velocity of 0 m/s?

ahh please help! i greatly appreciate it

2007-10-17 23:05:04 · 5 answers · asked by cocomademoiselle 5 in Physics

Y~unif(0,1). Find a function phi(Y) such that X=phi(Y) has density f given by f(x) = 2x, whenever x is in [0,1], and f(x)=0 elsewhere.

2007-10-17 22:56:47 · 2 answers · asked by bloopbloop 2 in Mathematics

2007-10-17 22:56:38 · 3 answers · asked by Anonymous in Physics

DESSERT?????

2007-10-17 22:55:49 · 3 answers · asked by andrew g 2 in Botany

NO I AM NOT TRYING TO COMMIT SUICIDE! I just like to learn about this sort of ****. It's a hobby.

Thank you very much.

2007-10-17 22:55:32 · 8 answers · asked by Amos E 3 in Medicine

5/a-5 + 3/5-a = ?

5/a-5 and 3/5-a are separate terms.

Is it equal to 2/a-5?

2007-10-17 22:46:34 · 7 answers · asked by Hooyah!df 2 in Mathematics

How would I calculate the maximum rate of change of f at the point (1,-2,-3) and the direction that it occurs of the function:

f(x,y,z)=ln(x*(y^2)*(z^3))

First person with correct answer and work gets 10 pts!

2007-10-17 22:41:54 · 1 answers · asked by sam b 5 in Mathematics

i need to know this..


pls

2007-10-17 22:35:35 · 2 answers · asked by rHaiN 1 in Physics

If,
1 Y (gamma photon) = e- + e+ (pair production)

then why not e- + e- = 1 gamma photon instead of 2 ? (annihilation)

2007-10-17 22:30:24 · 2 answers · asked by Rick 2 in Physics

2007-10-17 22:27:04 · 5 answers · asked by Mike A 1 in Physics

2007-10-17 22:26:41 · 7 answers · asked by manikantan s 1 in Engineering

Since the Earth is around 5 billion years old I can't help but wonder what the chances are that a solar eclipse can take place at the time when inteligent beings are able to view it. From Earth's perspective the Sun is 400 times further away then the moon but the moon is 400 times smaller meaning we view both sun and moon as same size. Science estimates that in under 600 million years a total eclipse will not be possible due to Moon moving further away together with the Sun expanding.

Is it just coincidence that this takes place at the time when the human being species exist. What are the chances of this hapening.

2007-10-17 22:22:35 · 7 answers · asked by Tony W 4 in Astronomy & Space

i know there are quite a few intermediate fossils when it comes to evolution.
however are there any intermediates that are still alive today? besides the example below.
example the legless lizard is concidered an intermediate between lizards and snakes.

are there others that are still living.
if so please show sources, as i would love to further my knowledge of evolution.

2007-10-17 22:19:19 · 5 answers · asked by alucard817 6 in Biology

A sample of cyclopropane (C3H6), a colorless gas with a pleasant odor that finds use a general anesthetic, occupies a volume of 2.00 L at 27o C and 1.00 atm pressure. What volume will this sample occupy at the same temperature, but at 2.25 atm?

2007-10-17 22:16:37 · 1 answers · asked by Anonymous in Chemistry

why is the calculated values of the resistance (e.g. total resistance) different from the measured values (using a software)? is there any discrepancy between the calculated and measured values?

2007-10-17 22:12:45 · 2 answers · asked by oopsy 1 in Physics

2007-10-17 22:10:47 · 12 answers · asked by muhammad razman r 1 in Mathematics