Science & Mathematics - 19 September 2006

2006-09-19 19:36:40 · 4 answers · asked by I &hearts Yahoo 2 in Zoology

2006-09-19 19:36:21 · 3 answers · asked by aasdfgg 1 in Astronomy & Space

2006-09-19 19:34:18 · 12 answers · asked by abhishek jain 1 in Engineering

i saw my friend got in a really bad fight with his parents, ive never seen him get that mad before.
Out of nowhere he yells out ouch and throws his keys on the ground. A little later I saw burns
marks on his hands that looked like key marks and he said it was probably his keyless remote because it was acting weird earlier. Its just dont see how a keyless remote can heat your keys so much it burns you.

2006-09-19 19:30:23 · 4 answers · asked by Mr M 1 in Chemistry

I know this is such a typical cop-out on homework, but I dropped $20 at Barnes and Noble on publications, Ive been looking at editorials, and Im having a terrible time "getting it". Does anyone have any suggestions for examples of logical fallacies? Quotes? Even places where I could find examples would be fantastic. Thanks in advance!

2006-09-19 19:28:49 · 3 answers · asked by neenerneener 2 in Other - Science

2006-09-19 19:26:59 · 21 answers · asked by good girl 1 in Zoology

I know multiplying the number of moles by avogadro's number gives me the number of particles in that mixture. I am told I need to multiply this by the number of different elements inside, eg. C6H12 's number of particles has to be multiplied by 18 in order to get the number of atoms.

2006-09-19 19:26:49 · 6 answers · asked by Emma Lee 2 in Chemistry

The function f is defined for all x that do not equal zero, in the interval -1 f(x)= (x-sin2x)/(sinx).

A) How should f(0) be defined in order that f be continuous for all x in the interval -1
B) With f(0) defined as in part (a), use the definition of the derivative to determine whether f'(0) exists. (I can probably do this part but I need some help starting this equation.)

And for those of you that have noticed yes I have been sitting here doing calculus for about 6-7 hours :P THANKS EVERYONE that has been helping out on some of this stuff, I'm still trying to get a hold on some of these concepts.

2006-09-19 19:20:07 · 7 answers · asked by Morph 1 in Mathematics

Why we use complex representation for periodic wave?

Exp(-jwt)=cos(wt)-jsin(wt)

Is it because it looks short and we just need the real part? The imaginary part is what for?

2006-09-19 19:17:04 · 2 answers · asked by LJ 2 in Mathematics

Does anyone have tips for this, especially for people not taking further math? It's the old Special Paper by the way, the one used in Singapore. Any theorems, manipulation tricks, concentrate on some qualitative answers? Aside from doing lots of practice papers. I'm doing the statistics option, by the way. The ten year series past year questions don't have answers, which is a pain. Any help much appreciated! =)

2006-09-19 19:04:01 · 2 answers · asked by draconsis 1 in Mathematics

determine the ratio of 3 to 12 which is 3 Quart pot of chili with 12
combined ingredients of peppers and tomatoes.
This is my wording, and the ratio choices are:
peppers tomatoes
3: 2
2: 3
2: 4
3: 4
1: 6

I used this:
Divide both terms of the ratio by the greatest common factor (12/3=4, 36/6 = 6 )
4/6 = 2/3
State the ratio. (The ratio of 3 to 12 is 2:3)
The Correct answer is B
2:3
2 Peppers: 3 Tomatoes
My answer is incorrect,
What am I doing wrong?

2006-09-19 18:59:47 · 2 answers · asked by SCHNITZEL 1 in Mathematics

2006-09-19 18:58:26 · 24 answers · asked by Anonymous in Physics

2006-09-19 18:57:48 · 11 answers · asked by sleepy_20us 2 in Earth Sciences & Geology

An object experiences a net zero external unbalanced froce.Is it possible for the object to be travelling with non-zero velocity?If yes,state the conditions that must be placed on magnitude and direction of velocity.If no,provide a reson.

2006-09-19 18:51:31 · 9 answers · asked by PRAVEEN R 1 in Physics

If you don't know what string theory is you need to read a book.

2006-09-19 18:50:06 · 10 answers · asked by tengu312003 3 in Mathematics

also what are its effects on humans? from my understanding so far, it is used in foods as flavoring.

2006-09-19 18:49:35 · 3 answers · asked by Anonymous in Chemistry

I have often thought that Earth is so unique, it harbours the only life in the universe! Everything had to be JUST right for life to first take a hold.

A denser atmosphere --> No life (Venus)
Too hot --> no life (Mercury)
Too little atmosphere --> No life (mars)
to name only three amazing co-incidences that have to be met.

So, do you believe Earth is the only life harbouring place in the universe? Is the odds of this accident happening again less than the number of stars with planets?

So far, we have not even found solid evidence of even a single celled form of life in the few places we have managed to explore and received no convincing signals from space (except the 'wow' signal SETI found but that could be natural).

2006-09-19 18:48:29 · 19 answers · asked by PollyPocket 4 in Astronomy & Space

at what angle would they intersect at??

2006-09-19 18:41:12 · 8 answers · asked by Anonymous in Mathematics

integral of sqrt(14x-x^2) dx

2006-09-19 18:38:23 · 3 answers · asked by Theresa C 2 in Mathematics

2006-09-19 18:26:51 · 8 answers · asked by p_rob22 1 in Zoology

I had an upper respiratory infection last year and took the antibiotics for about a week and forgot the remaining days. (should have been 10). But I felt better. Then it seems like months later I had breathing problem again, not sure if it was common cold or same infection. I got better again w/o meds. Now a year later I've been feeling heavy in the lungs for about a 4 weeks. I wake up,clear my throat and spit solid dark colored phlegm for a few minutes. Is it possible I have the same infection? Doesn't the body kill off the infection eventually or become immune? Or can infections calm down and become dormant in the body, to attack again at a later time?

2006-09-19 18:22:36 · 11 answers · asked by Getsbetterwithtime 3 in Medicine

x-2y=8
y=-4x+5

and

x-2y=0
3x+y=0

2006-09-19 18:21:02 · 13 answers · asked by booo 1 in Mathematics

2006-09-19 18:20:40 · 7 answers · asked by Devin J 1 in Mathematics

A barren island without trees or shrubs is covered with rocks and low-growing grasses. A strong and steady breeze sweeps across the island all of the time and it blows out to sea. On the island lives a peculiar beetle without wings. Where wings should be has little stubs that are of no use for flying. In fact, these beetles never attempt to fly. They stay close to the ground where the rocks and grasses provide some protection against the wind. This island lies about 1/2 mile off the mainland.

The mainland, which is heavily wooded, has many trees and shrubs that break the force of the wind. The identical beetle lives on the mainland. There is one major difference- the mainland beetles have wings of normal size and move about freely in the protected environment.

2006-09-19 18:19:28 · 1 answers · asked by Anonymous in Biology

2006-09-19 18:18:27 · 3 answers · asked by king i 1 in Chemistry

this question applies to veterinary medicine

2006-09-19 18:16:12 · 3 answers · asked by blckmustng2002 1 in Medicine

A right circular cone and a hemisphere have the same base, and the cone is inscribed in the hemisphere. The figure is expanding in such a way that the combined surface area of the hemisphere and its base are increasing at a constant rate of 18 square inches per second. At what rate is the volume of the cone changing at the instant when the radius of the common base is 4 inches?

The surface area of a sphere of radius r is
S=4*pi*r^2
and the volume of a right circular cone of height h and radius r is
V=(1/3)*pi*(r^2)*h


I have taken the equation of the sphere and divided it by 2 for the equation of the Surface Area of a hemisphere then I found the derivative of that which makes the rate of change of the SA to be 8*pi.
Then I took that and divided by 18(in^2)/second
which comes out as (4*pi/9) seconds.
Here is where I am stuck and I do not know if the work I have done is even remotely close to my final goal rate of change of volume of the cone at 4 radius h.

Help Plz

2006-09-19 18:14:09 · 5 answers · asked by Morph 1 in Mathematics

My son birth date is 13th august 2006. so i want a name of his which is suitable for him in future education, job and good healthy life

2006-09-19 18:13:52 · 2 answers · asked by Anonymous in Astronomy & Space

No other info is given just the picture of the graph. The graph I'm working on is a positive slope starting at (0,.5) and ends at (2, 5)

Any help is greatly appreciated!

2006-09-19 18:13:39 · 7 answers · asked by ecogrl23 2 in Mathematics

2006-09-19 18:10:59 · 9 answers · asked by frane_pe 2 in Engineering