Science & Mathematics - 4 September 2006

2006-09-04 18:02:06 · 25 answers · asked by charis 1 in Astronomy & Space

I went to another person's house one day and noticed that the ants there seem a lot blacker than the ones at mine.

Another thing: I've also noticed a difference between the ants at my house which is that some have a lighter "end"--that last circle is a clearish dark brownish color--while the rest are just a normal black.

What causes these color changes?

And yes, I know I must have a lot of time on my hands to observe these things, haha.

2006-09-04 18:01:13 · 2 answers · asked by blank 4 in Zoology

I require some concrete answers, not just some phenomenon like Ideomotor effect, please ?

2006-09-04 18:00:22 · 6 answers · asked by Anonymous in Physics

Tonight I was watching a Katrina documentary and started getting very nervous and then started crying a lot,not sobbing(that was the first week after) just steady crying even after I turned it off, I thank God my whole family made it, my best friends son did not & she could not even get in touch with me till after the funeral. I know many people who can not handle these shows either, is something wrong with us or is this normal. If we would not have been prepared I do not know where we would have gotten help,we were cut off from the world. Although I have never been more proud of MS because we pulled together, why can I not watch, it seems we try to act if life is still the same. It has changed, crime far exceeds what we have ever seen, more people want hand outs with many jobs avalible,police are quiting, we can not go out at night without getting robbed, murdered, & rape is rampant,not all but a lot of the new people are mean, and our officials tell us everything is the same!

2006-09-04 17:54:59 · 5 answers · asked by livlafluv 4 in Weather

2006-09-04 17:53:55 · 4 answers · asked by Willem V 3 in Physics

2006-09-04 17:52:34 · 12 answers · asked by LadyRebecca 6 in Other - Science

TI-83 Plus...is this right? I can't find notes on it! If not, what is the right formula to enter into the calculator?

2006-09-04 17:49:45 · 4 answers · asked by Helzabet 6 in Mathematics

Beaker A and Beaker B contains 320ml of water. 3 metal rods and 4 beads were put in to Beaker A and the volume is 433cm cube. 4 metal rods and 3 beads were put in to Beaker B and the volume is 438cm cube. What is the volume of each metal rod and bead?

2006-09-04 17:49:30 · 6 answers · asked by megal 1 in Mathematics

2006-09-04 17:48:13 · 2 answers · asked by ? 2 in Biology

2006-09-04 17:47:18 · 2 answers · asked by ? 2 in Biology

2006-09-04 17:45:56 · 3 answers · asked by ? 2 in Biology

1. Find the prodct:
(0.0028x + 0.38)(0.4x + 0.46)


2. The polynomial function I(t) = -.1t^2 + 1.9t represents the yearly income (or loss) from a real estate investment, where t is time in years. After what year does incomebegin to decline?

Year 19, Year 8.5, Year 9.5, or Year 12.67 ?????

3. Add or subtract as indicated:
(5x^5 + 2x^7 - 7+4x^6) - (9 - 9x^6 + 7x^7 -7x^5)


I would greatly appreciate some help with these because I'm totally stumped.

2006-09-04 17:44:25 · 8 answers · asked by EARNEYW 3 in Mathematics

i'm thinking its polarity, let me know if i'm wrong

2006-09-04 17:44:13 · 4 answers · asked by ? 2 in Biology

2006-09-04 17:44:02 · 23 answers · asked by Buzz Lightyear 1 in Astronomy & Space

We use Gnu 2.1.73 and SciTE

fprintf('\nThis program solves the equation ax^2+bx+c=0 for x.\n\n');
a = input('Enter the coefficient a: ');
b = input('Enter the coefficient b: ');
c = input('Enter the coefficient c: ');

if(a==b==c==0)
fprintf('all possible solutions\n');
elseif(a==b==0)
fprintf('no possible solutions\n');
elseif(b^2-4*a*c < 0)
fprintf('no real solutions\n');
elseif(b^2-4*a*c ==0)
x = -b/(2*a)
fprintf('%3.2f.\n', x);
elseif(b^2-4*a*c > 0)
x1 = (-b+(((b^2)-4*a*c)^(1/2)))/(2*a)
x2 = (-b-(((b^2-4*a*c)^(1/2))))/(2*a)
fprintf('The quadratic equation has two solutions:');
disp([x1 x2]);
end;

2006-09-04 17:39:28 · 4 answers · asked by Anonymous in Engineering

2006-09-04 17:35:44 · 2 answers · asked by Xiufeng Jinglong 1 in Biology

I hate just asking the same questions from the assignment, but time's running out and I've never done anything like this before, so I know if I try to work through it and ask specific questions I'll get nowhere, but if I ask hopefully someone can explain. So:

The random variable X measures the concentration of ethanol in a chemical solution, and the random variable Y measures the acidity. They have a joint probability density function f(x,y) = A(20 – x – 2y) for 0<=x<=5 and 0<=y<=5 and f(x,y)=0 elsewhere.
A)What is the value of A?
B)What is P(1<=X<=2, 2<=Y<=3)?
C)Construct the marginal probability density functions fX(x) and fY(y)
D)Are the ethanol concentration and the acidity independent?
E)What are the expectation and the variance of the ethanal concentration?
F)What are the expectation and variance of the acidity?
G)If the ethanol concentration is 3, what is the conditional probability density function of the acidity?

Explanations, not just answers, please.

2006-09-04 17:33:05 · 1 answers · asked by Anonymous 3 in Mathematics

Do any of the scientists know or have they proven that ,as we know eventualy or sun will grow like all bigs stars do and then collapse into themselves,now , how many stars has that happened to since they begin of the universe?And what is the propabilty of previous solar systems like ours were created,a sun like ours was created,then destoyed itself leaving black hole and all evidence of its existance destroyed????

2006-09-04 17:32:59 · 5 answers · asked by Eoin M 1 in Earth Sciences & Geology

2006-09-04 17:31:53 · 4 answers · asked by Prasoon 1 in Biology

when we talk of total resistance in a circuit, is internal resistance also counted? can a circuit have both parallel and series connections?

2006-09-04 17:31:21 · 7 answers · asked by mugdha_coolgirl8 1 in Chemistry

ok you have 0.1 M NaNO3

which has a greater osmolarity...

0.1 M NaCl or 0.1 M NaNO3?

and please explain in details.

2006-09-04 17:26:27 · 2 answers · asked by Anonymous in Chemistry

Oklahoma will celebrate its centennial of statehood in 2007
You can visit my blog http://rwnug.multiply.com

2006-09-04 17:26:25 · 26 answers · asked by Anonymous in Geography

One of the steps in the commercial process for converting ammonia to nitric acid is the conversion of NH3 to NO.

4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g)

In a certain experiment, 4.70 g of NH3 reacts with 5.83 g of O2.

Which is the limiting reactant? The answer is O2

How many grams of NO form? The answer is 4.37

How many grams of the excess reactant remains after the limiting reactant is completely consumed? THIS IS MY QUESTION. 4 was my original answer, but my teacher said it was wrong.

2006-09-04 17:25:09 · 1 answers · asked by cheezzznitz 5 in Chemistry

Pluto is not a planet anymore. It is now called a dwarf planet. Will Pluto be used in the curriculum?
What is going to happen to the exhibits in museums which feature Pluto (talk about its details)?

2006-09-04 17:24:20 · 10 answers · asked by Tegeirian2003 3 in Astronomy & Space

According to popular belief man landed on the moon in 1969. Setting aside various problems with the official version of events let me ask a simple, scientific question. Given the state of scientific knowledge in 1969 (which knew little of the huge effect of radiation that exists within the Van Allen belt circling the earth) how does one explain the fact that (1) when questioned the astronauts said they barely noticed passing throught it and (2) no provision whatsoever was made to protect the astronauts from the deadly concentrations of radiation they would have met if they really did travel to the moon. Let us have some real answers this time and not just fudge on this issue. The facts simply do not suggest that these astronauts would have survived travelling through this huge and deadly belt of radiation.

2006-09-04 17:21:25 · 11 answers · asked by democracynow 2 in Astronomy & Space

2006-09-04 17:19:54 · 10 answers · asked by kunalpimpalkar4u 1 in Engineering

is there really a gene of fate?
based in the film Gattaca...

2006-09-04 17:19:04 · 2 answers · asked by Anonymous in Biology

2006-09-04 17:17:03 · 1 answers · asked by appolo 1 in Chemistry

2006-09-04 17:16:06 · 9 answers · asked by John G 5 in Physics

An airplane is flying at a speed of 340 mi/h at an altitude of one mile and passes directly over a radar station at time t = 0.

There are 3 parts to this question. I found the first part but need the second two.

(a) Express the horizontal distance d (in miles) that the plane has flown as a function of t.
d(t) = 340t

(b) Express the distance s between the plane and the radar station as a function of d.
s(d) = ???

(c) Use composition to express s as a function of t.
s(t) = ???

2006-09-04 17:13:00 · 3 answers · asked by Anonymous in Mathematics