Science & Mathematics - 9 October 2006

Please can someone show me how

(cos^2(x))(d^2y)/(dx^2) + (2cosx)(sinx)(dy/dx) + 2y = xcos^3(x)

simplifies to

(d^2z)/(dx^2) + z = x

using the substitution

y = zcosx where z is a function of x

2006-10-09 07:26:02 · 3 answers · asked by Anonymous in Mathematics

2006-10-09 07:24:25 · 8 answers · asked by jammy.greeny@talk21.com 1 in Other - Science

when a,b,c are the lenghts of an triangle then:
a/(b+c-a)+ b/(c+a-b)+(a+b-c) > or = 3

2006-10-09 07:20:37 · 1 answers · asked by Stiuler E 1 in Mathematics

It's a cosmetic product that claims to "protect your DNA from cell damage."
Now my knowledge of biology isn`t encyclopedic, but isn`t DNA present in our cells? as oppesed to being a cell it'self?.Am I right in thinking there`s no such thing as a "DNA cell"?
so, is this just all pseudo-scientific nonsense designed to sway the "scientificly ignorant masses"?

2006-10-09 07:15:08 · 18 answers · asked by badger_shaman 3 in Biology

will someone help me this is one of my questions on my science review due tomarrow :00

2006-10-09 07:12:39 · 4 answers · asked by nicole 1 in Physics

Like actually be born and raised there? Or is it too cold??

2006-10-09 07:05:10 · 14 answers · asked by Anonymous in Geography

i have a problem for derivatives and it says :
x^3=y^3=y

is this a typo since there are 2 equal signs, or does it mean y is equal to x^3, so the derivative is 3x^2?

2006-10-09 07:04:06 · 11 answers · asked by Anonymous in Mathematics

2006-10-09 07:01:21 · 3 answers · asked by Normandy 1 in Earth Sciences & Geology

According to a creationist view

2006-10-09 07:01:09 · 8 answers · asked by Anonymous in Earth Sciences & Geology

gating in the biology sense

2006-10-09 06:54:27 · 2 answers · asked by christianjameling 1 in Biology

Give reasons for your response.

2006-10-09 06:54:14 · 11 answers · asked by hunnk33 1 in Astronomy & Space

2006-10-09 06:54:09 · 5 answers · asked by Anonymous in Biology

2006-10-09 06:52:18 · 5 answers · asked by christianjameling 1 in Biology

2006-10-09 06:51:51 · 0 answers · asked by Dallas B 1 in Chemistry

2006-10-09 06:51:47 · 6 answers · asked by hunnk33 1 in Astronomy & Space

2006-10-09 06:48:07 · 16 answers · asked by nadia 1 in Biology

2006-10-09 06:46:25 · 25 answers · asked by Dirty Rob 3 in Biology

i have a riddle here and was wondering if anyone can get it? here it goes:
"Suppose that someone put down a copper coin, a silver coin, and a gold coin and asked you to make a statement, with the understanding that if your statement is true, then you will be given one of the 3 coins, not saying which one, but if your staement is false, then you will be given no coin. what statement could you make that would guarentee that you would get the gold coin?"

and yes there is an answer

2006-10-09 06:45:04 · 2 answers · asked by crl_hein 5 in Other - Science

initial speed of the marble is 3.0meters/second. Each step is .18 meters high and .30 meters wide. Which step does the marble strike first? (The answer given is "step 4", but I need to know how- using the kinematic equation)

2006-10-09 06:44:21 · 3 answers · asked by Anonymous in Physics

If the camera is 3.7m in front of mirror at what distance should the camera lens be focused in meters?

2006-10-09 06:44:06 · 2 answers · asked by bluedevilbabygirl 1 in Other - Science

i hate school and that stupid mathematics never goes into my brain.

2006-10-09 06:43:19 · 23 answers · asked by Anonymous in Mathematics

I cant concentrate, i procrastinate everything, Im a senior in college and i might fail all my classes. I just dont understand why i cant study. I dont think i have ADD, but no matter what i do or how i try i cant focus.
i know your suggestions find a quiet place or study before hand a little bit each day. I have tryed everything, but i open my book and wonder off thinking of other things.
I think i have a mental problem or i am not determined, which i think i am. What do you think?

2006-10-09 06:43:18 · 8 answers · asked by James 2 in Biology

i have been studying about the sequences od DNA but i have seen in many detective programmes that the experts of the foreinsic sciences find out the type of DNA from a hair follicle. how is it done? i am very curious to know. can anybody tell me the proper answer for this?

2006-10-09 06:42:18 · 5 answers · asked by Anonymous in Biology

Where in the mirror must he look to see his feet? (Measured from the floor in meters)

2006-10-09 06:41:43 · 3 answers · asked by bluedevilbabygirl 1 in Other - Science

waht are 5 secondary compounds found on plants that we use for medicine?

ex opium poppy>codeine>pain

2006-10-09 06:37:06 · 4 answers · asked by Jorie 1 in Medicine

2006-10-09 06:36:45 · 6 answers · asked by angeleyes3789 1 in Mathematics

2006-10-09 06:34:17 · 44 answers · asked by Elle J Morgan 6 in Weather

i read a fish and game magazine that explained to much details for me to understand.. so can some einstein help me out with this theory like bring it down to a page.

2006-10-09 06:30:58 · 7 answers · asked by Wesley!!! 3 in Biology

An Elavator of Mass 800kg is descending at a speed of 4.0 metres per second. Find the shortest distance over which this elavator could be stopped if the greatest force the cable can withstand is 11000 newtons?

2006-10-09 06:29:20 · 6 answers · asked by Anonymous in Physics

curve is - r(t) =

i got r'(0) = <π,3π,0>

and r'(1/2) = <0,0,-π>

what is my next step?

2006-10-09 06:27:45 · 2 answers · asked by Faraz S 3 in Mathematics