Science & Mathematics - 18 January 2007

this sounds simple but really is'nt

2007-01-18 06:53:45 · 25 answers · asked by fred f 1 in Geography

I thought I knew what it was... Isn't it where you continue to work it into the demcials?

2007-01-18 06:53:25 · 5 answers · asked by AlienJack J 3 in Mathematics

prove:-
(1)int(e^(ax)sin(bx))dx
=e^(ax){(asinbx-bcosbx)/
(a^2+b^2)}+C
(2)int(e^(ax)cos(bx))dx
=e^(ax){(acosbx+bsinbx)/
(a^2+b^2)}+C

-a similar question was asked
yesterday,however,this is
more difficult

-use integration by parts from
first principles and you will
get it!

ra

2007-01-18 06:50:15 · 2 answers · asked by Anonymous in Mathematics

Looking for flasks to perform bacteria growth

2007-01-18 06:46:48 · 3 answers · asked by Marika 1 in Biology

2007-01-18 06:46:44 · 3 answers · asked by Rose 2 in Biology

CH3CH2CH3 + Br2 ---> ?
i need to know how to find three different possible products and how to balance the reaction. above the arrow is the word Light.
i think i should replace the H with Br, but do i do that to all the H or just one.
Thanks for your help!

2007-01-18 06:46:25 · 6 answers · asked by Anonymous in Chemistry

2007-01-18 06:46:22 · 4 answers · asked by Brett/Becky T 1 in Weather

∫C(0,1) of ((z^2-3z+1)/(z(z^2-3)))dz
calculate the integral and find all the redisudes.

*C(0,1) is the circle center at 0 with radius 1.

2007-01-18 06:45:46 · 1 answers · asked by kula o 2 in Mathematics

2007-01-18 06:43:12 · 7 answers · asked by ladona c 1 in Mathematics

2007-01-18 06:42:02 · 15 answers · asked by Anonymous in Earth Sciences & Geology

1.What is obesiety?
2.What can happen to a obbese person?
3.What is anarexia?
4.WHat kind of desise is it?
5.WHat is the term 'milk teeth mean?
6.What is the permanent teeth?

please short answers...when answering put the number of the question next to the answer..thanks!

2007-01-18 06:40:33 · 3 answers · asked by ▐▀▀▼▀▀▌ ►۩BaM۩ ◄ ▐▄▄▲▄▄▌ 3 in Biology

2007-01-18 06:40:26 · 3 answers · asked by hoopkid139 2 in Weather

I have an algorithm which produces an X/Y coordinate for a map based on Latitude and Longitude.
I would like to create an algorithm which does the exact opposite - takes an X and Y coordinate and returns the appropriate Lat/Long.

In my code, earthRadius, earthCircum and earthHalfRadius are constants which can be taken as given.

My program also has a zoom level, which has been taken into account in the code you see below:

Parameters: latitude, longitude, zoomLevel

double arc = earthCircum / ((1 << (zoomLevel)) * 256);
double sinLat = Math.sin(latitude);
double metersY = earthRadius / 2 * Math.log((1 + sinLat) / (1 - sinLat));
double y = (earthHalfCirc - metersY) / arc;

double metersX = earthRadius * longitude;
double x = (earthHalfCirc + metersX) / arc;

return: x, y

In case you are not familiar with code, the term (1 << (zoomLevel)) can be read as (2^zoomLevel).

Any ideas?

2007-01-18 06:39:45 · 3 answers · asked by Liam D 1 in Mathematics

I'm doing a science experiment, and I need to see what agents I can use to show if calcium is present in a solution.

Help!

2007-01-18 06:39:15 · 2 answers · asked by Lost@Sea 3 in Chemistry

We all know that the physical markers for the Celsius temperature scale are the freezing and boiling points of water at one atmosphere of pressure equaling 0 and 100 respectively.

So what are the physical markers of the Fahrenheit scale?

2007-01-18 06:36:30 · 6 answers · asked by sprcpt 6 in Physics

2007-01-18 06:35:21 · 2 answers · asked by hoopkid139 2 in Weather

2007-01-18 06:33:37 · 2 answers · asked by Latsy B 1 in Earth Sciences & Geology

I need help integrating:

1/cos^2(y) with respect to y.

1/(2x^(1/2)) with respect to x.

I need to know the technique to solve these. I am kind of rusty on these things.

thanks!

2007-01-18 06:31:59 · 4 answers · asked by abe_cooldude 1 in Mathematics

1. Solve the rational equation below.
(z^2)/(8) - (7z)/(8) = 1

2. Solve the rational equation below.
(n^2)/(2)-(5n)/(6) -2 =0

3. Solve the rational equation below.
(x+1)/(2x)=(x-1)/(2x-1)

4. Find one ordered pair solution for the equation below, when x=2.

f(x)=2x3+x2-10x-5

(2,3)
(2,-3)
(2,5)
(2,-5)

5. Find the remainder when x3-5x2+8 is divided by x-2.

Note: You must make adjustments for the missing x-term.
0
-4
-20
-32

6. Is (x-3) a factor of p(x)=x4-5x2-27x+15?

7. Find the zeros of the polynomial:

f(x) =(x-4)(x+2)(x-1)

8. For the polynomial P(x)= 2x3+5x2-3x-4

a. Use Descartes' Rule to analyze the zeros of the function.
b. Use the Rational Zeros Theorem to identify the possible rational zeros.

9. Given a zero: x=2, of the polynomial: x3-4x2+21x-34=0, find the others.

Thanks for helping guys, algebra is really my worst subject and i cant figure out how to do these.

2007-01-18 06:31:49 · 5 answers · asked by Anonymous in Mathematics

2007-01-18 06:26:06 · 6 answers · asked by logan2012 1 in Astronomy & Space

A) F
B) Br
C) Po
D) Pb

I picked C, because it has the largest atomic mass, and the polarizability is directly related to the atomic/molecular mass.

Yet somehow the answer is D.

The question is followed one.

Which has the smallest polarizability?
A) Si
B) S
C) Te
D) Bi

I picked Si, because it has the lowest atomic mass. Again, the answer is different. The correct answer is written as B.

What am I doing wrong?

Are the shells which the electrons occupy to be taken into account?

2007-01-18 06:23:59 · 1 answers · asked by other_user 2 in Chemistry

When people talk about emmissions of CO2 they often talk about it in tons. Do they actually mean the weight of it or the volume? If they mean the weight, how would they measure Hydrogen or helium?

2007-01-18 06:23:58 · 9 answers · asked by Chrisssy 2 in Other - Science

A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×104 Pa, while in the region of blockage it is 1.15×104 Pa. Furthermore, she knows that blood flowing through the normal artery just before the point of blockage is traveling at 30.0 cm, and the specific gravity of this patient's blood is 1.06.What percentage of the cross-sectional area of the patient's artery is blocked by the plaque?

I would appreciate any kind of help, hints in how to start the problem thank you.

2007-01-18 06:23:49 · 1 answers · asked by Anonymous in Physics

49 mL of .200 M HCl is mixed with 50 mL of .2 M NaOH to reach endpoint.

Calculate the [H+] and [OH-]

2007-01-18 06:22:46 · 1 answers · asked by Anonymous in Chemistry

...or is it an extremely expensive wild goose chase?

How do we know when to give up, or is it a blank cheque?

2007-01-18 06:21:54 · 9 answers · asked by mesun1408 6 in Physics

it's just a light snow here in NJ

2007-01-18 06:21:54 · 9 answers · asked by start 6-22-06 summer time Mom 6 in Weather

How do I integrate:

1/((e^-y)+1) dy

2007-01-18 06:21:37 · 4 answers · asked by takeashot30 4 in Mathematics

2007-01-18 06:21:17 · 8 answers · asked by Anonymous in Astronomy & Space

What is the correlation between a circle graphed on a cartesian plane and the formula (x-a)²+(y-b)²=r²? In other words, how did they come up with the previous formula to graph a circle? How does this work?

2007-01-18 06:18:37 · 7 answers · asked by TPCAN 3 in Mathematics

2007-01-18 06:17:31 · 3 answers · asked by Anonymous in Chemistry