Science & Mathematics - 17 September 2007

2007-09-17 19:39:26 · 3 answers · asked by Darcy C 1 in Mathematics

2007-09-17 19:38:33 · 2 answers · asked by Mashy 1 in Chemistry

Hi,

Is it spirit or brain or something else?
What do they claim?

PLEASE DO NOT ANSWER WITH LINKS.
PLEASE SHOW YOUR SOURCES.

Thank you very much.

2007-09-17 19:35:11 · 8 answers · asked by survey taker 2 in Parapsychology

500g to kg to mg
2.5kg to g to hg
0.45mg to g to cg
2500cg to g to kg
2600g to mg to kg

2007-09-17 19:30:39 · 3 answers · asked by Jeniv the Brit 7 in Mathematics

Does anybody know a good site where i can get a good clean list of Math formula's

please list the sites if you do, thanks

2007-09-17 19:29:12 · 3 answers · asked by Charles R 2 in Mathematics

find the speed of an object having the position vector:
r(t) = sin(t) i +sqrt(2) cos(t) j + sin(t) k

2007-09-17 19:25:28 · 2 answers · asked by Anonymous in Mathematics

A 50.0g piece of iron @ 152 C is dropped into 20.0g H2O(l) at 89 C in an open, thermally insulated container. How much water would you expect to vaporize, assuming no water splashes out? The specific heats of iron and water are 0.45 and 4.21 J/ g C , respectively, and Hvaporization = 40.7 KJ/mol H2O.

Help!!!


:(

2007-09-17 19:22:04 · 1 answers · asked by iQuestions 2 in Chemistry

2007-09-17 19:18:22 · 4 answers · asked by lexi p 1 in Mathematics

identify the plane curve given by the vector-valued function: r(t) = 3t^(2)i + (1 - t)j

is it a parabola, a hyperbola, a line, a circle ... or none of those???

2007-09-17 19:17:30 · 1 answers · asked by Anonymous in Mathematics

The desert temp, H, oscillates daily between 40 degrees F @ 5am and 80 degrees F @ 5pm. write a possible formula for H in terms of t, measured in hours from 5 am. Explain your answer please or at least how to get the answer.

2007-09-17 19:12:43 · 3 answers · asked by tigersfan48111 2 in Mathematics

y' = sqrt(x+y+1)

We've normally been substituting vx for y, and vdx + xdv for dy, but i'm so lost from the start :(

THANK YOU VERY VERY MUCH IN ADVANCE!!!

2007-09-17 19:10:09 · 2 answers · asked by stackinchips11 2 in Mathematics

2007-09-17 19:02:24 · 4 answers · asked by kamilyn75 1 in Geography

ive been trying forever to figure out this problem and id really appreciate some help.

"A rectangle inscribed in an equilateral triangle with a perimeter of 30 cm.

a) express area 'A' of the rectangle as a function of the height 'H' cm of the rectangle.

b) Find the dimensions of the rectangle with the largest area."

2007-09-17 19:01:15 · 2 answers · asked by nasgmx,zncv xc 2 in Mathematics

A piece of Styrofoam maving a mass m carries a net charge of -q and floats above the center of a very large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet?

The force of gravity must be equal to the electric force for the Styrofoam to "float"..

Fg = Fe
mg = qE

I'm at a loss as to what to do next. I think there's a relationship that ties the field strength to the charge density, but I have no clue what it is. Some help?

2007-09-17 18:59:27 · 2 answers · asked by darkhydra21 3 in Physics

a. Consider f(x), g(x) E Z(subscript 7)[x], where f(x)=x^7, g(x)=x
Prove that f(c)=g(c) for all c E Z(subscript 7)?

b. Now let f(x), g(x) E Z(subscript 7)[x], where f(x) does not equal g(x) and deg f <7, deg g<7.
Prove that there exists c E Z(subscript 7) such that f(c) does not equal g(c)?

Help would be much appreciated!

2007-09-17 18:52:17 · 2 answers · asked by James S 1 in Mathematics

2007-09-17 18:50:01 · 1 answers · asked by beeboppinbippity 1 in Mathematics

Can someone please determine q(x) and r(x) as described by the division algorithm such that f(x)=g(x)q(x) + r(x) so that i can check my answers for the following:

a. f(x)= x^6+3x^5+4x^2-3x+2 and g(x)= x^2+2x-3

and

b. f(x0=x^6+3x^5+4x^2-3x+2 and g(x)= 3x^2+2x-3

Cheers

2007-09-17 18:47:09 · 2 answers · asked by James S 1 in Mathematics

plz provide a link or the name of the book.
also do not provide a simple answer of one or two words, a description must be provided

thnx

2007-09-17 18:47:03 · 4 answers · asked by Similo 1 in Engineering

What is the mass of the beaker with the added mercury?

2007-09-17 18:46:03 · 1 answers · asked by Anonymous in Chemistry

2007-09-17 18:44:54 · 4 answers · asked by JAMES 4 in Engineering

Reiteration of question goes [here].

2007-09-17 18:43:32 · 14 answers · asked by C'thulhu 1 in Chemistry

2007-09-17 18:38:33 · 7 answers · asked by Anonymous in Astronomy & Space

2007-09-17 18:38:26 · 9 answers · asked by engelfeurs 2 in Astronomy & Space

(quadratic equations)

.

2007-09-17 18:35:59 · 6 answers · asked by scarface 1 in Mathematics

http://answers.yahoo.com/question/index;_ylt=Ag4PHVQqHlZcwBo9kRhAlT3sy6IX;_ylv=3?qid=20070917221238AADFhbI

2007-09-17 18:33:55 · 3 answers · asked by Anonymous in Astronomy & Space

Thanks, I'm working on math homework and for some reason my brain can't figure this out....I've been working on it for some time.

2007-09-17 18:32:37 · 7 answers · asked by cosmicgirl 2 in Mathematics

2007-09-17 18:30:04 · 5 answers · asked by kryptosgenio 2 in Astronomy & Space

What purpose does the addition of finely divided charcoal serve during the recrystallization of impure solids?

2007-09-17 18:22:34 · 2 answers · asked by David N 1 in Chemistry

it wasnt the north sky definitly the east

2007-09-17 18:22:03 · 18 answers · asked by Anonymous in Astronomy & Space

Do the people of callifornia have nothing to worry about from this fault??? explain.

2007-09-17 18:13:08 · 2 answers · asked by ~~xx{Stelth[k9]}xx~~ 1 in Earth Sciences & Geology