Science & Mathematics - 29 January 2007

why does the amount of gas and temperature have to remain constant in order for pressure and volume to be directly proportional, or when testing the relationship between vol. and press.?

i'm reviewing for a test. ahhhhhh!


thank youuuuu.

2007-01-29 08:18:50 · 3 answers · asked by alexie. 4 in Chemistry

Why are the three Pythagorian identities called Pythagorian identities? How do you prove them?

2007-01-29 08:18:21 · 4 answers · asked by weirdmath 2 in Mathematics

a^2 + b^2 = c^2

2007-01-29 08:17:42 · 4 answers · asked by Tiara 1 in Mathematics

2007-01-29 08:17:29 · 3 answers · asked by jamaicangirl 1 in Mathematics

Is it for "decoration", or do they have an aerodynamic effect?

2007-01-29 08:15:51 · 7 answers · asked by comedycatalyst 2 in Physics

John, Mary, Thomas and Sheila all have mobile phones with the same company, so all four of them have different numbers. One day, while quite bored, they decide to play the following game. First, each of them subtracts the numbers of the other three people from their own number, then multiplies the three resulting differences together, and finally divides 1 by the result.

So, for instance, if the numbers of the four friends were J (for John's number), M (for Mary's number), T (for Thomas' number), S (for Sheila's number), then John would calculate

1 divided by the product (J - M)x(J - T)x(J - S),

while Mary would calculate

1 divided by the product (M - J)x(M - T)x(M - S).


If John, Mary, Thomas and Sheila add up the four answers obtained in this way, what will the sum be?

2007-01-29 08:12:12 · 7 answers · asked by ▓▒░ ♫ Pump !t up ♫ ▓▒░ 6 in Mathematics

2007-01-29 08:11:46 · 20 answers · asked by patrick e 3 in Geography

Please tell me!! Its a what are the stars in the constellation phoenix!? Its a project I'm doing on!! And please.......tell me the magnitude, what type of star it is, distance from earth, color and surface tempurature for each star!! you dont have to but you could at least be nice!! >0<

2007-01-29 08:11:44 · 6 answers · asked by Anonymous in Astronomy & Space

if a string vibrates at the fundamental frequency of 528 hz and also produces an overtone with a frequency of 1.056 hz, this overtone is the
a. first harmonic
b. second harmonic
c. third harmonic
d. fourth harmonic

2007-01-29 08:11:40 · 3 answers · asked by Lynn D 1 in Mathematics

2007-01-29 08:11:13 · 4 answers · asked by Notre1Dame 2 in Physics

2007-01-29 08:10:10 · 2 answers · asked by Anonymous in Chemistry

Hold a pencil in front of your eyes at a position where it's end just blocks out the sun. Make appropriate measurements to estimate the diameter of the sun, given that the earth sun distance (mean) is 149.6x10^6 km.

2007-01-29 08:09:59 · 3 answers · asked by Ladi 2 in Earth Sciences & Geology

2007-01-29 08:08:35 · 7 answers · asked by bernie cee 1 in Mathematics

evalute each expression?

2007-01-29 08:08:31 · 1 answers · asked by king 1 in Mathematics

2007-01-29 08:07:27 · 6 answers · asked by homiecharms 1 in Chemistry

Would this have something to do with kinetic energy/theory?

2007-01-29 08:07:16 · 5 answers · asked by alexpaolella 1 in Chemistry

2007-01-29 08:04:56 · 5 answers · asked by Ladi 2 in Earth Sciences & Geology

the way i'm supposed to do it is in simpler form. so not counting 1 by 1 and adding it. something faster.

2007-01-29 08:04:44 · 2 answers · asked by Cutie 4 in Mathematics

√ is square root

2007-01-29 08:03:46 · 5 answers · asked by Anonymous in Mathematics

Cells in your hair follicles produce the protein keratin, which is a primary component of hair. Cells in your liver do not produce keratin. Why does this specialization occur?

A.Hair follicle cells contain different genes than liver cells.

B.Hair follicle cells do not produce DNA, but liver cells do.

C.Different types of genes are activated in liver cells and hair follicle cells.

D.Hair follicle cells contain recombinant DNA.

2007-01-29 08:02:54 · 6 answers · asked by Anonymous in Biology

Okay so there was this chemist named wohler now i have a few questions about him
1) What is his first name
2) WHat did he do
3 can u give me a good site about him?

2007-01-29 08:02:44 · 3 answers · asked by Thank you 1 in Chemistry

firewood is often sold by the cord.Acord of wood is a bundle measuring 4 feet by 4 by 8 feet.What is the volume of a cord of wood in cubic feet?
a.4.74 cubic feet
b.128 cubic feet
c.64 cubic feet
d.3,456 cubic feet
ty very much for ur help :)

2007-01-29 08:02:01 · 6 answers · asked by Hailey 1 in Mathematics

2007-01-29 08:01:02 · 11 answers · asked by errbud 2 in Zoology

I ate a hideous amount of popcorn yesterday while watching Babel and it made me wonder.

2007-01-29 08:00:00 · 9 answers · asked by toothybaboon 1 in Physics

evalute each expression?

2007-01-29 07:59:42 · 3 answers · asked by king 1 in Mathematics

2007-01-29 07:57:52 · 4 answers · asked by Anonymous in Geography

I have a lab write up due tomorrow but I can't figure out the correct angle for the magnitude or vise versa. We had to set up a machine that if you were to get the resultant vector correct, all the weights on the other vectors would reach an equilibrium with the resultant. I'm sure I got the magnitude correct because the weights evened out but the angle the magnitude suggests is incorrect. Here's the problem:

A force of 500g at 60 degrees, a force of 400g at 150 degrees, and a force of 300g at 250 degrees.

I need to find the resultant for that. Any help would be great!

2007-01-29 07:57:15 · 3 answers · asked by Anonymous in Physics

I was asked to prove that this is equal to 4(cosh A)^3 -3(cosh A). This is easy using the usual trig rules and applying Osborn's Rule, but can it be proved by rewriting cosh 3A in its exponential form and working from there? (Like proving sinh 2A = 2 sinh A cosh A by turning sinh 2A into e^2A etc. and using difference of two squares.)

2007-01-29 07:55:44 · 2 answers · asked by Anonymous in Mathematics

2007-01-29 07:55:37 · 5 answers · asked by Anonymous in Engineering

Given the following data:


2Mg + O2 → 2MgO Delta = −1204


MgO + H2O → Mg(OH)2 Delta H = −37


2H2O → 2H2 + O2 Delta H = +572 kJ

2007-01-29 07:55:18 · 1 answers · asked by simonkf2002 1 in Chemistry