Science & Mathematics - 6 September 2007

sqrt(x)

Is it a "square root function"? Or exponential, since sqrt(x) = x^(1/2)? Or would it be more proper to call it an "inverse quadratic" since y=sqrt(x) is the inverse or y=x^2

2007-09-06 05:51:25 · 2 answers · asked by de4th 4 in Mathematics

Suppose you have 1A DC current flowing through 1 inch of straight wire. Physics textbooks always show circular, concentric magnetic lines around the wire at a cross-section "slice" of the wire where the direction of the lines is determined by the right-hand rule.

In reality, the lines extend across the entire length of the wire. So are the "lines" really discrete or are they continuous like a cylinder (length-wise) ? If not, then what's the distance between the lines along the length of the wire? Also, what's the distance between the concentric lines for a given cross-area?

I'm not even sure if these are meaningful questions but it'd help me to visualize what inductance really is (# of magnetic lines divided by current).

Thanks.

2007-09-06 05:51:21 · 6 answers · asked by ckrich_99 1 in Physics

I think its crazy and they have no idea what hapened even a few thousand years ago...its just another example of the arrogance of those who consider themselves to be the Elite amongst us. Do you really believe them?

2007-09-06 05:50:40 · 14 answers · asked by ronald b 2 in Astronomy & Space

2007-09-06 05:50:23 · 4 answers · asked by Renee V 1 in Mathematics

Do phenols react with carboxylic acids to form esters? If not, then why not?Thanks!

2007-09-06 05:48:10 · 3 answers · asked by Muneeb 1 in Chemistry

i have this dehumidfier it has alredy collected 5 lts of water in about 15 hours,has all this water come from the room its in,or could some of the water come from the unit it self as it works on refridgaration and condensing,it just seems alot of water for a short space of time.hope you can help

2007-09-06 05:46:07 · 8 answers · asked by tugboat 4 in Engineering

2007-09-06 05:41:32 · 8 answers · asked by Froda 2 in Other - Science

2007-09-06 05:39:45 · 12 answers · asked by nisha 2 in Mathematics

where in england can i buy this stuff for etching?

2007-09-06 05:38:26 · 4 answers · asked by olie b 1 in Chemistry

and they crossed the border into Scotland.
The train conductor looked out the window and said look, a black sheep.
The NASA engineer predeclared, the sheep in Scotland are black.
The NASA Mathematician said, no, at least one or more sheep in Scotland are black.
The NASA physicist says no we know that at least one side of one sheep in Scotland is black.
The NASA statistician declared the sample size is too small and therefore not statistically significant.
The NASA administrator after hearing that says that settles it, there are no black sheep in Scotland.

** Explain Why the NASA Administrator is correct. **

2007-09-06 05:37:11 · 12 answers · asked by Anonymous in Astronomy & Space

The position of a particle moving along an x axis is given by x = 15.0t^2 - 4.00t^3, where x is in meters and t is in seconds. Determine (a) What is the maximum positive coordinate reached by the particle and (b) at what time is it reached? (c) What is the maximum positive velocity reached by the particle and (d) at what time is it reached? (e) What is the acceleration of the particle at the instant the particle is not moving (other than at t = 0)? (f) Determine the average velocity of the particle between t = 0 and t = 3.00 s

2007-09-06 05:35:36 · 2 answers · asked by Tastytaint 1 in Physics

Along with a description of their job. Please don't use common one's such as civil; aerospace; mechanical.

2007-09-06 05:30:01 · 10 answers · asked by freezing_out_here 2 in Engineering

I'm flying to Kentucky soon, and we're suppose to be getting thunder-showers the day I take off. Is it safe for a plane to fly in a thunderstorm, and if so, what if it gets struck by lightning? Does it bounce off, or does it do damage to the plane? Also, I'm flying by Southwest

2007-09-06 05:29:34 · 7 answers · asked by kelmarie1985 2 in Weather

2007-09-06 05:29:18 · 22 answers · asked by tootybug31 1 in Geography

You have 8*8 matrix & 6*1 matrix. 8*8 matrix divide for only once (Eg:- 7*8 & 1*8) ; By using this create the 7*9 matrix.

2007-09-06 05:29:10 · 3 answers · asked by amit_pawar2007 1 in Mathematics

How all the matter can fit into one atom.

2007-09-06 05:27:59 · 8 answers · asked by fantastic 2 in Astronomy & Space

2007-09-06 05:27:19 · 7 answers · asked by Anonymous in Physics

Hi everyone! I just wanted to know how to expand brackets when you have an equation like 4x-(x+3)=x-3. It's just mainly the first part of the equation that I'm stuck on so if you could please find the time to help me, it would really be appreciated. Thanks!!!

2007-09-06 05:14:28 · 10 answers · asked by nisha 2 in Mathematics

Combine like terms to simplify the algebraic expression: 4x2 + 2x + 5x2 + 3x

14x3

9x2 + 5x

6x2 + 8x

9x2 + 6x
Combine like terms to simplify the algebraic expression: 4a + 5b + 2a + 3b

6a + 8b

14ab

9a + 5b

7a + 7b

Combine like terms to simplify the algebraic expression: 2x + 7y + 8 + 3x + y - 1

13xy + 7

5x + 7y + 7

5x + 8y + 7

5x + 8y + 9
Match the expression with the word phrase:
6 less than twice a number.

2n – 6

2n + 6

6n – 2

6 – 2n
Match the expression with the word phrase:
The difference between a number and 4.

4 – n

4n

n – 4

n ÷ 4

2007-09-06 05:14:09 · 3 answers · asked by Anonymous in Mathematics

If you have a room covered in magnets and they are super stong if you walked in would you get pulled a part from the force or would you float? Or if you had a room that had the two negative sides on the floor and on the ceiling, would it squish anything in that room from the two pushing away from each other?

2007-09-06 05:11:09 · 9 answers · asked by Anonymous in Other - Science

HVAC has water chiller system.
Firefighting has sprinklers as well as hose reel systems.
Water supply and drainage are with normal ppr and upvc pipes respectively.

2007-09-06 05:08:04 · 1 answers · asked by Ansar A 1 in Engineering

2007-09-06 05:04:43 · 8 answers · asked by jijiji 1 in Medicine

2-4x < 6 or 3 -x > 9

2[ 8 - 3 (y-2) ] = 5 - 2 (y = 4)

2007-09-06 05:00:08 · 4 answers · asked by tinabug 1 in Mathematics

I know there's a lot of them out there. I wish to know which one you consider the best in terms of screen output and good interactive interface.

2007-09-06 04:59:35 · 2 answers · asked by 700BILLIONPOORER 3 in Physics

from the top of a 35.3-m tall building. The ball then passes the top of a window that is 13.3 m above the ground 2.00 s after being thrown. What is the speed of the ball as it passes the top of the window?

2007-09-06 04:58:16 · 2 answers · asked by Fashionably lame 1 in Physics

vertically upward from ground level at time t = 0. At time t = 1.6 s it passes the top of a tall tower, and 1.5 s later it reaches its maximum height. What is the height of the tower?

2007-09-06 04:57:24 · 1 answers · asked by Fashionably lame 1 in Physics

2007-09-06 04:52:11 · 12 answers · asked by redbone001 1 in Mathematics

Can successful researchers be absolutely certain of their results, prove theories once and for all?

2007-09-06 04:52:02 · 9 answers · asked by ? 1 in Astronomy & Space

2007-09-06 04:51:00 · 7 answers · asked by SAD 1 in Weather

15 1/3 - 7 4/5
18 1/5 - 3 7/8

2007-09-06 04:47:04 · 4 answers · asked by Jolene 2 in Mathematics