Science & Mathematics - 15 February 2007

DUDE! theres a foot of ice on the ground the snow froze and now its all ice everywhere! it sucks!!! it was all over my car and i had to bash the ice for like an hour to get it off!!!

2007-02-15 16:52:59 · 4 answers · asked by Anonymous in Weather

2007-02-15 16:51:54 · 6 answers · asked by alone 2 in Astronomy & Space

does anyone know the answer to this
A 150.0.0-g sample of a metal at 75.0°C is added to 150.0
H20 at 15.0°C. The temperature of the water rises to 18.3°C.
Calculate the specific heat capacity of the metal, assuming
all the heat lost by the metal and gained by the H20?

2007-02-15 16:50:50 · 2 answers · asked by Anonymous in Chemistry

In my biplogy class, we just finished learning about evolution and Darwin's theory.

I myself, believe in evolution. I believe that it took millions to billions of years for humans to evolve into he way we are now.


I respect Darwin and in my class(I'm in the 10th grade) we did sort of a trial where people were either on the for evolution side or the against evolution side. we picked a scientist or person who supported evolution or who didn't. I was Charles Darwin himself.


I wanted to know what people though about Darwin and his theory. what side are you on?

2007-02-15 16:50:42 · 13 answers · asked by The_Resa 2 in Biology

2007-02-15 16:49:41 · 7 answers · asked by Anonymous in Zoology

2007-02-15 16:48:43 · 3 answers · asked by Anonymous in Mathematics

A diver springs upward with an initial speed of 8 m/s from a diving board that is 3 m above the water.

a.) What is the maximum height the diver reaches above the water?
m

b.) Find the total time the diver is airborne.
s

c.) Will the diver spend more time travelling upwards or downwards? Explain.

2007-02-15 16:48:13 · 3 answers · asked by soccerjock 2 in Physics

Thanks

2007-02-15 16:47:29 · 5 answers · asked by element69ca 1 in Engineering

So I am taking a class that writes tons of proofs this semester, and I am really strugling. I can never figure out how to approach a problem. The methods we have learned are proof by contradicion, proof by induction, indirect proofs, proof by contrapositive.... I think that is it. Are there any general guidlines for when which method should be used?

2007-02-15 16:47:16 · 4 answers · asked by Anonymous in Mathematics

I'm under the impression that no matter what the circumstances, air will always decrease in temperature when rapidly decompressed. I also believe that air increases in temperature when rapidly compressed. Am I correct?

My chemistry book has a question reading "Calculate the decrease in temperature when 2,000ml of a gas at 20.0 C is compressed to 1.0 L"

Using charles law (V1/T1=V2/T2) the answer to the above problem is -126.5C according to my chemistry teacher. How is this possible? Not only does this not make sense because gasses increase in temperature when compressed, but also in real life when you compress 2 liters of gas into a 1 liter space the change in temperature is barely noticable. Can anyone explain what's going on here?
Thank you

2007-02-15 16:46:54 · 8 answers · asked by exon111 2 in Chemistry

2007-02-15 16:45:24 · 10 answers · asked by . 3 in Astronomy & Space

2007-02-15 16:44:57 · 20 answers · asked by hronikey2005 2 in Astronomy & Space

The graphs of the equations y=2x+1, y=-1/2x+11/2, and y=2x+4 form three sides of a parallelogram. Complete the parallelogram by writing an equation for the graph that forms the fourth side. Justify your choice.

Explain how to determine whether the parallelogram is a rectangle. Is it a rectangle? Justify your answer.

Graph the equation on the same coordiante axes. Is the graph consistent with your conclusion?

2007-02-15 16:43:49 · 4 answers · asked by KayPee 1 in Mathematics

i was wondering what would happend if one day was noked in to the earths orbits ,can both planet co exsite in the same orbit path with out hitting each other off line .

2007-02-15 16:43:32 · 4 answers · asked by budbud1a 2 in Astronomy & Space

2007-02-15 16:43:22 · 2 answers · asked by maddy 1 in Chemistry

2007-02-15 16:42:17 · 14 answers · asked by Brian B 1 in Earth Sciences & Geology

and has anyone ever tried it?

2007-02-15 16:41:51 · 7 answers · asked by Fernando C 2 in Astronomy & Space

10 pts to correct answer.

2007-02-15 16:41:00 · 4 answers · asked by Cheez it 2 in Mathematics

2007-02-15 16:40:40 · 3 answers · asked by tootsie 5 in Chemistry

thank you! also it would be helpful if i knew the geographic distribution.

2007-02-15 16:38:23 · 2 answers · asked by sundaysunshine 2 in Zoology

man wishes to vacuum his car with a canister vacuum cleaner marked 550 W at 120 V. The car is parked far from the building so he uses an extension cord 15.0 m long to plug the cleaner into a 120 V source. Assume that the cleaner has constant resistance.
(a) If the resistance of each of the two conductors of the extension cord is 0.900 , what is the actual power delivered to the cleaner?
W
(b) If, instead, the power is to be at least 540 W, what must be the diameter of each of the two identical copper conductors in the cord the young man buys?
mm
(c) Repeat part (b) if the power is to be at least 547 W. [Suggestion: A symbolic solution can simplify the calculations.]
mm

2007-02-15 16:37:38 · 1 answers · asked by Anonymous in Physics

Find the absolute maximum and absolute minimum values of f on the given interval.

f(x) = x - 2 cosx, [-pi,pi]

2007-02-15 16:36:51 · 3 answers · asked by Mina 1 in Mathematics

for 3rd graders or so

2007-02-15 16:34:53 · 1 answers · asked by Yana 2 in Mathematics

Big test tomorrow and these are the only problems I'm oblivious on solving:

a) log3 (x+4) - log x = 2

b) log2 (x + 6) - log2 x = 4

c)3.5^(3p-10) = 11.7

2007-02-15 16:33:19 · 3 answers · asked by georgie0515 1 in Mathematics

but don't know what setting i have to have in my computer and tv

2007-02-15 16:31:12 · 3 answers · asked by Tom 1 in Engineering

2007-02-15 16:29:18 · 9 answers · asked by vera s 1 in Biology

2007-02-15 16:28:55 · 6 answers · asked by Anonymous in Mathematics

what is the molarity of a K2Cr2O7 solution if 35.0 ml of it are required for complete reaction with 50.0 ml of 0.161 M FeSO4 solution? the products of the reaction include Fe3+ and Cr3+

2007-02-15 16:27:20 · 1 answers · asked by Blesson 2 in Chemistry

it seems like an obvious statement, but i'm having problems proving it. the actual statement is for prime p which does not divide integers a and b so that means that (a, p) = (b, p) = 1.

i've been working with the definition of divisibility but haven't gotten very far with that.

the second part of the problem asks me to prove that "a^p ≡ b^p mod p" implies "a^p ≡ b^p mod p^2" for the same conditions of a, b, and p. i've again made some attempts with divisibility rules, but to no success.

maybe you can give me some suggestions or anything. thanks a lot. here's what i have that seems to hold the most promise:

a^p ≡ b^p mod p implies

p | a^p - b^p

p | [a^(p/2) + b^(p/2)][a^(p/2) - b^(p/2)]

but i don't know.... anyways, thanks again for the help.

2007-02-15 16:25:44 · 4 answers · asked by Jesse 2 in Mathematics

What I meen is, when we say 'I' , most of us mean our body(the way we feel our face muscles, male or female, how big or how small, our tone of voise, our habbits..........) at least that what I mean when I say 'I'.
But then who sees, who heers, who feels?
Eyes work by converting the light that 'hits' the eyes into electric impulses which then travel into our brain to be converted again for whom (very rough explanation of how eyes work)
So coming back to the seER, that ' picture' that I (not known I) see, does it mean that I am my brain, because it is the brain that sees, heers, feels or not? Maybe the brain is just converting all the information for me, but then who Am I?
If i am not my body, not my brain, but I see , I feel , I hear , Who am I? I see the feeling but I don't see myself, who am I?
Who are you?
not from books but from you own experience

2007-02-15 16:25:41 · 20 answers · asked by WhoArEyOu 1 in Other - Alternative