Science & Mathematics - 28 November 2007

2007-11-28 15:41:07 · 9 answers · asked by CARLOS L 2 in Mathematics

(1) dQ/dt = -Q/RC
(2)Q=Qoe^-t/RC note:Qo is the initial charge.

For equation 2 is called the solution, because when Q(t) is plug into equation 1, the left side will equal to the right side.

How do i demonstrate that RC has the dimensions of time?

2007-11-28 15:40:11 · 1 answers · asked by dav s 2 in Physics

y = (x - 5)(x + 3)


I think the answer is -4 or 8. But I may be wrong. Help is highly appreciated. :)

2007-11-28 15:37:36 · 3 answers · asked by dumbhoe 1 in Mathematics

i need it quick hurry!!!! its for my science project

2007-11-28 15:35:20 · 2 answers · asked by Anonymous in Chemistry

The catergories are
Kingdom
Phylum
Class
Order
Family
Genus
Species


Remember to use the first letter of each catergory.
Good Luck

2007-11-28 15:35:17 · 9 answers · asked by ♥Amor♥ 2 in Zoology

pls.explain!thank you..=)

2007-11-28 15:34:31 · 5 answers · asked by rexie13 1 in Physics

OK, Let w(m) give the weight of an avg. sized baby girl who is m months old.

2. An 8-month baby girl weighs w(13) pounds. Is she of avg. weight, above avg., or below avg.? Justify your answer....and yes...it IS w(13) pounds...definately.

Ok, I pretty much think this is an inverse but I have absolutely no clue on how to solve it...HELP!

So far I've gotten all three here so I need the right answer...I'm leaning towards overweight but not sure...

can u explain in kinda detail why too?


THANKS!!!

2007-11-28 15:32:45 · 5 answers · asked by Anonymous in Mathematics

2007-11-28 15:31:27 · 1 answers · asked by Anonymous in Chemistry

2007-11-28 15:30:13 · 8 answers · asked by Jerry H 1 in Zoology

2007-11-28 15:24:03 · 4 answers · asked by Nam N 1 in Biology

2007-11-28 15:21:41 · 2 answers · asked by Anonymous in Chemistry

i tried and i got -4sin12x-3cos12x, but i dont think its right. after you get the differentiation, could you set it to 0 and solve for x? and show the steps? i completely forgot how to do trig but i think this will help. thanks!

2007-11-28 15:20:55 · 1 answers · asked by Anonymous in Mathematics

6^(2n-1) + 1 prove its divisible by 7. (please note that the +1 is not in the power (2n-1) )

Base case (n=1) 6^(2(1)-1) +1 = 7/7 = 1
since its an integer the base is satisfied.
Now assume the property holds for n=k such that 7 divides 6^(2k-1) +1.
Now let n=k+1

6^(2(k+1)-1) +1 ---->
6^(2k+2-1) + 1 = ?? im lost here...

2007-11-28 15:20:09 · 6 answers · asked by Ray 3 in Mathematics

what is the answer to this (√2+√3)*(√2-√3)
and explain please because i don't get it

2007-11-28 15:18:28 · 10 answers · asked by Anonymous in Mathematics

the length and width of a rectangle are 6m. by 4m.. when each dimension is increased by the same amounth, the area of the new rectangle is 50 m (squared)...... solve it in quadratic form....

2007-11-28 15:18:22 · 1 answers · asked by desu_shigaisen 1 in Mathematics

Also known as paraffin oil, liquid paraffin or unscented baby oil. I need it to submerge a computer in.

Alternatively, I need a commonly available clear liquid that is non conductive, doesn't dissolve anything associated with computer components, and preferrably doesn't freeze above -30 degrees celsius.

2007-11-28 15:17:33 · 1 answers · asked by Anonymous in Chemistry

what is the melting and boiling point?
is it a medal? wat family it belong to

2007-11-28 15:16:59 · 3 answers · asked by jeanah m 1 in Chemistry

we did this reactions lab and watch the chemical reaction,
what are 3 sources of experimental error and how it could affect your results?

all i could think of is contamination, i need two more!

2007-11-28 15:14:30 · 4 answers · asked by Anonymous in Chemistry

f(x) = (2+x^2) /( 1 +x^2)

2007-11-28 15:12:53 · 3 answers · asked by Anonymous in Mathematics

I am trying to find the answer to this integral problem

9 dx
-------
xln3x

I had a previous question that was the same but the answers were incorrect...
I'm completely lost when it comes to integrating fractions, could someone give me a boost?

2007-11-28 15:12:40 · 2 answers · asked by ret80soft 1 in Mathematics

which is better

Honolulu City Haunts night walking tour
Orbs of Oahu night driving tour
Sacred Spirits day driving tour

http://www.oahughosttours.com/

i cant decide which one to do

2007-11-28 15:08:48 · 5 answers · asked by Jon J 1 in Paranormal Phenomena

x^4-13x^2+36=0
i got x^2- 6.5x=-36
then i needed to square the 6.5 but I don't have a calculator..

Formula -(b)+-RARICAL (B^2-4ac)/(2A)
3x^2-6x=24
a.3
b.6
c.-24
I got 22 and 12

write 4 and -1 in quadratic formula
I got (x-4) (x--1)

2007-11-28 15:08:44 · 2 answers · asked by Anonymous in Mathematics

Love of physics, To be able to ask why how and what if.To see water burn(yes it dose)Not for just the love of the science,but, It could save our collective@!#$&%$#@! butts.knowlege is power.

2007-11-28 15:08:29 · 3 answers · asked by Little Wing 2 in Other - Alternative

just a procedure will do

thanks a lot!

2007-11-28 15:07:45 · 3 answers · asked by coolchic 3 in Chemistry

2007-11-28 15:07:08 · 13 answers · asked by Anonymous in Astronomy & Space

Suppose you lived on the moon. Suppose the earth was directly over your head. How long would it be before you would see the earth set?

a) one day (one earth day, 24 hours)
b) one-fourth of a day (6 hours)
c) one month (the time it takes the moon to orbit the earth)
d) one-fourth of a month
e) you would never see the earth set

2007-11-28 15:06:36 · 3 answers · asked by ? 6 in Physics

2007-11-28 15:05:19 · 5 answers · asked by To-the-Stars 4 in Chemistry

2007-11-28 15:04:35 · 7 answers · asked by 123456 2 in Medicine

2 beads of mass m and charge q.
when placed in a hemispherical bowl of radius R with a frictionless, nonconducting walls, the beads move, and at equilibrium they are a distance R apart. Determine the charge on each bead.


____________/\....
___________/__\...
__________/____\
_________/______\
________/________\
_______/__________\
______/____________\
m [bead]=======[bead]m

the diagram is in an equilateral triangle ignore the "_"
so it will be R on each side of the triangle and the two beads m , m on the left and right side on bottom.
and ofcourse this triangle is inscribed in a semi sircle.. where the beads are the only parts of the triangle touching the semi sircle and the top of the semicircle is empty space.


The answer in the book is R(mg/[(k)(sqrt(3])^1/2 i tried forever and cant figure it out
Thanks

2007-11-28 15:04:14 · 1 answers · asked by MeNeedHelp 2 in Physics

3x^2 - 2x = 10

I did.

x = 2 (2)^2 - 4 (3) (10) divided by 2 ( 3)

x = 2 4 - 120 divided by 6

I got 2 + 4.3 divded by 10 equals 0.83

2 - 6 divided by 6 equals 0.6

The final answers I got are 0.83 and 0.6 is that correct, if not could someone please help me.

2007-11-28 15:02:19 · 10 answers · asked by gizzie76 1 in Mathematics