Science & Mathematics - 11 September 2007

2007-09-11 03:39:13 · 1 answers · asked by Anonymous in Chemistry

1. 5y-(2y-10)-25

2. 2/3(x-2)-1-1/4(x-3)

3. 9/10y-7/10-21/5

thanx a lot!

2007-09-11 03:34:49 · 4 answers · asked by dreamz 4 in Mathematics

2007-09-11 03:30:14 · 7 answers · asked by Lorraine R 1 in Zoology

1) Given: 0.209g vapor
757mmHg
100.5 degrees celsius or 373.5 K
Volume of flask 151mL
2)2.82g gas
639mL
27degrees or 300K
1.00 atm ???
I am not sure for one thing how to find the R (ideal gas law)
M=mRT/PV

2007-09-11 03:29:59 · 1 answers · asked by luawai 1 in Chemistry

2007-09-11 03:28:25 · 3 answers · asked by Lorraine R 1 in Zoology

When you look at statistics, it there have been many more tornadoes recorded annually during the past 10 to 20 years than in previous years. Does this mean that the severe weather of Tornado Alley is getting even MORE severe? Why might the statistical records show an increase?

2007-09-11 03:27:38 · 4 answers · asked by justall4ofus 2 in Weather

2007-09-11 03:24:30 · 4 answers · asked by Red Falcon 1 in Mathematics

Is thorough heat-sinking a good preventative measure? Can I do more?

2007-09-11 03:24:09 · 4 answers · asked by nowyermessingwithasonofabitch 4 in Physics

i need their evolution history starting from the earliest form of seahorses

2007-09-11 03:22:29 · 2 answers · asked by cutie 1 in Biology

do we eat spiders or flies in our sleep? If so how many?

2007-09-11 03:20:31 · 2 answers · asked by daisymoomoocow7 1 in Zoology

A particle initially located at the origin has an acceleration of 2.00 m/s2 and an initial velocity of 0 = 8.00 m/s.
(a) Find the vector position at any time t (where t is measured in seconds).
( t i ) m
Find the vector velocity at any time t.
( + wrong check mark
The correct answer is not zero.t ) m/s

(b) Find the coordinates of the particle at t = 3.00 s.
x = m
y = m
Find the speed of the particle at this time.
m/s

2007-09-11 03:16:25 · 2 answers · asked by Dustin 1 in Physics

Bought 100% apple juice in a plastic 96 oz container. Drank some, no problem. A few days later I took the cap off and it was totally carbonated. Smelled like Alcohol too. Poured it out into the sink, and it fizzed like Ginger ale. Can this occur naturally, or did some "house guest" play a sick joke?

2007-09-11 03:15:49 · 3 answers · asked by Kelly A 4 in Chemistry

I was walking this morning at around 4:45a.m. in a residential street. and in one of the neighbors yards there were four deer grazing. I heard a growl and at the same time the deer bolted. This is not a rare occurrance I live in Humboldt County in a part of town bordered by country, redwoods, farms etc..last year I came upon a black female and at least one cub maybe two. Because I grew up on 12 acres of Redwoods on a farm I'm used to wildlife and track bear, mountain lions etc.. However; I've never seen more than one adult in an area and there were at least two. The biggest one was sitting on it's haunches and was easily 200lbs. I had my very weak flashlight and half of a binnocular that's very old. But I'm very sure they were mountain lions. I just want to be totally sure. I think I should call animal control because two or three adults running together doesn't sound right to me. Any input?

2007-09-11 03:15:08 · 5 answers · asked by Rien V 1 in Zoology

Let F(x)= f(f(x))
G(x)= F(x)^2
You also know that
f(4)=7
f(7)=2
f '(7)= 8
f '(4)=7

2007-09-11 03:11:41 · 2 answers · asked by Anonymous in Mathematics

Find a compound proposition involving the propositions p, q, and r that is true when p and q are true and r is false, but that is false otherwise

2007-09-11 03:11:05 · 3 answers · asked by Digital d 2 in Mathematics

tell me!

2007-09-11 03:10:49 · 4 answers · asked by Anonymous in Weather

does it interfere with gravity, I was imagining it as a still calm glass of water you drop a stone in there it effects it in several ways, so I was thinking maybe the fridge and other stuff there dumping in space might be something to do with the hurricanes effecting earth now.

2007-09-11 03:09:55 · 17 answers · asked by Anonymous in Astronomy & Space

given that f(x) = 4 / square root of (x^2 + 9)

and the equation of the normal at the point of inflexion lying in the 1st quadrant is m*(square of n)*y - k*(square root of l)*x + 665 = 0
find the values of k, l , m , n

ps: i found f'' (x) to be : 4*(square root of (x^2 + 9)) * (2x^2-9) / (x^2 + 9 ) ^3

2007-09-11 03:09:54 · 3 answers · asked by DeSeRT EaGLe 1 in Mathematics

Consider the functions f(x) and g(x), for which
f(0)=3
g(0)=8
f '(0)=9
g'(0)=-6

2007-09-11 03:09:08 · 3 answers · asked by Anonymous in Mathematics

Subsonic sounds are sounds which are of frequencies below the minimum hearing range of humans. But these sounds can travel long distances without getting distorted. Some animals can feel such vibrations which are naturally caused by the earth which warns the animals about earth quakes days before they reach their location. But my point is, if we can study these sounds we can build a better earthquake detection system using proper electronics...

2007-09-11 03:07:13 · 4 answers · asked by Vj Chris 2 in Earth Sciences & Geology

If Ann's batting average is 0.320, how many hits would she expect to get in 25 times at bat?

2007-09-11 03:07:04 · 3 answers · asked by Alley 1 in Mathematics

A helicopter is ascending vertically with a speed of 5.20m/s. At a height of 125m above the earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [ hint: the package's intial spped equals the helicopter's.]

2007-09-11 03:00:12 · 5 answers · asked by Anonymous in Physics

A ballplayer catches a ball 3.0s after throwing it vertically upward. With what speed did he throw it and what height did it reach?

2007-09-11 02:56:59 · 4 answers · asked by Anonymous in Physics

1. What's the use of knowing the center of gravity?
2. Is the center of gravity of a meterstick always located at the 50cm mark?
3. What do drivers mean when they say the car needs wheel balancing?
4. A traffic signal light is suspended by the cables. Under what condition will the tension be equal to the weight of the signal light?
5. Is it possible for the center of gravity to lie outside the body?
6. Does the center of gravity always coincide with the geometrical center of objects?

My answers: 1. for balance? 2. Yes (because it's a regular shaped object?) 3. wheel balancing - allows tires to spin without causing vibrations. 4. translational equilibrium (first) 5. Yes. 6. No (for irregularly shaped objects?)

Are my answers correct? Any more additional info to be added is appreciated. Thanks!

2007-09-11 02:56:52 · 3 answers · asked by nandemonai 2 in Physics

Some months ago I asked the question at http://answers.yahoo.com/question/index;_ylt=AoZQQ796ABG1xfCSMoOOT9pIzKIX;_ylv=3?qid=20070326151241AAxToH1
about bilateral condensation points of R. We should prove that, if S is an uncountable subset of R, then the set of it's bilateral condensation points, as well as the set of the bilateral condensation points of S that are in S, is uncountable. Then, I came up with a proof cited in the additional details to the original question. A bit messy, but I think it's right. I would like opinions of people who, like you, enjoy such problems.
Thank you

Definitions: If S is a subset of a topological space, we say x is a condensation point of S if every neighborhood of x contains uncountably many elements of S. We can prove that, if S has a countable topological base and S is uncountable, then the set of condensation points of S is uncountable. In the case of R, there are 2 kinds of condensation points:

2007-09-11 02:52:57 · 3 answers · asked by Steiner 7 in Mathematics

2007-09-11 02:51:20 · 2 answers · asked by aims 1 in Mathematics

friends just got back from USA. They visited NASA and had a "lecture" from "an astronaut who told them he and colleagues had lived on the moon for three days". Did this happen and I completely missed it or is it a hoax/

2007-09-11 02:49:52 · 8 answers · asked by Anonymous in Astronomy & Space

Its mid september...i'm getting pretty sick of 95 degree days. When can I expect it to get cooler and possible rainfall?

2007-09-11 02:46:00 · 3 answers · asked by Brad 3 in Weather

You know, in case I ever build a spaceship.

2007-09-11 02:42:03 · 9 answers · asked by joezen777 5 in Astronomy & Space

I know that designing and building robots is done by a group of people, and that each one of them are experts in their own field.

But how many fields are there??
I only know about *Electronics* and *Artificial Intelligence*.. what else??

2007-09-11 02:36:09 · 1 answers · asked by ... 2 in Engineering