Science & Mathematics - 30 September 2006

Please keep in mind that I am not challenging you to prove evolution or disprove creation- I don't want this to end up into a 100-pg. long argument of "additional details" and "edits." Besides, I think those arguments are kinda pointless on Yahoo Answers because, let's face it, NOBODY is gonna read this and think, "Oh, she says to prove Evolution and I can't so I'll become a Creationist" or vice versa. Plus, there's no way on Yahoo Answers to readily debate back-and-forth, so.... I'm just asking for your own feedback.

Now, here's my question: The 2nd law of thermodynamics states that "entropy of the universe increases during any spontaneous process" (this was the shortest and plainest definition I could find. it's at www.entropysite.com if you want to look it up.) Entropy means "disorder," right? More energy goes into a proccess than comes out of it. Order goes to disorder. Everything goes from "better" to "worse."
Darn, I'm running out of space here. Read on please....

2006-09-30 17:24:41 · 15 answers · asked by ATWolf 5 in Earth Sciences & Geology

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word problem question?

alright I know this is an easy question...but I'm stupid

Fourteen students in P's class were asked to shake hands with each other. Each student shook hands with each of the other students exactly once. How many handshakes occurres in Ms. Power's class?

-I got 90... is that right?

2006-09-30 17:20:38 · 12 answers · asked by clara 1 in Mathematics

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How to calculate potential diffeence of a three parallel connected resistors?

suppose A is starting point.Three resistors are connected in parallel.
R=r1=r2=r3=1,and E1=3volt,E2=2volt,E3=1 volt.
suppose a point A is starting point and after that R is resistor,from resistor,three parallel resisters are connected say r1=r2=r3=1,and E1=3 volt,E2=2 volt and E3=1 volt. outside the circuit point B is the end.What will be the potential difference between point A&B

2006-09-30 17:17:14 · 8 answers · asked by shashi l 1 in Physics

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can u tell me about the history of pi?

a short history about pi, how pi was discovered and how it has reached the final conclusion, the mathematicians involved in this and other details.

2006-09-30 17:16:24 · 6 answers · asked by Anj 1 in Mathematics

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describe a metalloid?

2006-09-30 17:15:56 · 7 answers · asked by shorty8n9m0 2 in Earth Sciences & Geology

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On a map, what do the black dots and dashes between the states usually represent?

2006-09-30 17:13:54 · 15 answers · asked by Scott M 1 in Geography

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Need help with 2 multivariable calculus problems please?

A) The question is [let u and v be vectors]:
prove that ||u+v||^2 + ||u-v||^2=2||u||^2+2||v||^2
and interpret the result geometrically by translating it into a theorem about parallelograms.

I went about proving the statement component wise, resulting in 2(u1)^2+2(u2)^2+ 2(v1)^2 + 2(v2)^2 = 2(u1)^2+2(u2)^2+ 2(v1)^2 + 2(v2)^2; however I don't know how to translate that into a theorem about parallelograms. Am I even attacking this problem in the correct manner?

B) Find the parametric equations for the line that is perpendicular to L1: x = 1 + 2t, y= 2-t, z=4-2t and L2: x= 9+t, y=5+3t, z = -4-t, and passes through their point of intersection

I found the point of intersection at (7, -1, -2) and I know that there is no y direction, but I cannot seem to find the x and z direction. Pretty much I need to find a and b in the following line but i do not know how.
x= 7 + At
y= -1
z= -2 + Bt

Any help on either would really be appreciated! Thanks!

2006-09-30 17:13:53 · 2 answers · asked by Mimi 2 in Mathematics

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What does it mean to have 'tight' muscles?

People commonly refer to muscles as being 'tense' or 'tight'. My girlfriend, for example, when she gives me a back massage, will say 'wow, the muscles in this spot on your back are really tight'.
I don't really understand this. Your muscle fibres are tight when you contract them, conciously or not. A contraction must result, however, in a movement, or a counter-contraction from an opposing muscle. How can a muscle be 'tight' in absence of movement or counter-contractions?

2006-09-30 17:12:28 · 10 answers · asked by dracmar@rogers.com 1 in Medicine

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My mouth is full of spit,are there little holes where my saliva drains out?

2006-09-30 17:11:49 · 2 answers · asked by realquietcool 2 in Biology

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Posted earlier & still can't figure/don't have correct answer...can you help?

Man pushes a 22 kg box across a frictionless floor. The box is initially at rest. He initially pushes on the box gently, but gradually increases his force so that the force he exerts on the box varies in time as F = (8.6 N/s)t. After 3 s, he stops pushing. The force is always exerted in the same direction.

What is the velocity of the box after 3 s? answer in m/s

How far has the man pushed the box in 3 s? answer in m

What is the average velocity of the box between 0 s and t? answer in m/s

What is the average force that the man exerts on the box while he is pushing it? answer in N

HELP!

2006-09-30 17:11:30 · 5 answers · asked by Dee 4 in Physics

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