Science & Mathematics - 30 October 2007

2007-10-30 06:24:03 · 8 answers · asked by tommiejbrothers 1 in Astronomy & Space

find the difference quotient of:
f(x)=-7x^2+9x-6


please show all work so I can start to understand this!!!!
:)

2007-10-30 06:18:18 · 3 answers · asked by Ayy Girl! 1 in Mathematics

2007-10-30 06:16:59 · 3 answers · asked by JACKIE 3 in Mathematics

2007-10-30 06:13:32 · 8 answers · asked by sam 2 in Engineering

Can I have a scientific explanation why and how metal expands?

2007-10-30 06:13:12 · 6 answers · asked by Anonymous in Physics

4x^2 + 10x + 3 = 0

x^2 = 3 - 4x

-4x^2 - 3x - 1 = 0

(3x + 5)^2 = 100

I know I'm suppose to use the quadratic formula for the first one (which I did, but I came up with a different answer than the choices given) but I don't know how to work the others. HELP!

2007-10-30 06:09:51 · 4 answers · asked by starscream 1 in Mathematics

Cobalt-60 is a radioactive isotope used to treat cancers of the brain and other tissues. A gamma ray emitted by an atom of this isotope has an energy of 1.33 MeV (million electron volts; 1 eV = 1.602 10-19 J). What is the frequency (in Hz) and wavelength (in m) of this gamma ray?
frequency
Hz
wavelength
m

2007-10-30 06:05:49 · 1 answers · asked by jnester0289 1 in Chemistry

As everyone knows, since winter has arrived, its been getting darker a lot earlier!

How long till its start lightening up again?

2007-10-30 06:05:44 · 12 answers · asked by CompleteCreation90 1 in Weather

ok i forgot how to these problems p(10,3)

&& i jus need sumone to work it out so i can see how u do it again thanxs
thiis would help out alot cuz i got homework on this
thanxs.

2007-10-30 06:05:21 · 1 answers · asked by cutejaz18 1 in Mathematics

2007-10-30 06:03:36 · 5 answers · asked by Fantastic 1 in Biology

2007-10-30 05:59:32 · 2 answers · asked by Erica 1 in Mathematics

Dr. Bob is preparing to operate on Sally for an immediately life-threatening condition. Just before he begins the operation, he discovers that she is 17 years old. Her parents, with whom Dr. Bob has never discussed the operation, are in the waiting room of the hospital. Using this scenario, discuss "informed consent" and describe what Dr. Bob should do in this situation and how his obligations might be different if Sally's parents were unavailable.

2007-10-30 05:59:00 · 3 answers · asked by crismarie 4 in Medicine

Buildings corode after hundreds of years...Fossils have survived millions of years. But after a certain about of time do people, living, things, planets, paintings, buildings, history, everything will just be forgotten and disappear with time?

2007-10-30 05:58:43 · 8 answers · asked by Anonymous in Astronomy & Space

Highway partol: A highwasy partol plane flies 3 mi above a level, straight road at a a steady 120 mi/h. the pilot sees an oncoming car and with radar determines that at teh instant the line of sight distance from ot car is 5mi, the-line-of-sight distance is decreasing at the rate of 160mi/h. find the car's speed along the highwasy.

2. The diameter of a tree was 10 in. during the following year, the circumference increased 2 in. abour how much did the tree's diameter increased? The tree's cross- section area?
my answer: it 6.28 in is this right please let me know. i don;t know how to find the trees cross section.

please help me i tried so many ways to solve these problem!

2007-10-30 05:56:57 · 1 answers · asked by Facilitate 1 in Mathematics

No stupid answers please

2007-10-30 05:55:24 · 8 answers · asked by Anonymous in Geography

construct an exclusive-NOR gate by interconnecting 2 3-state buffers and two inverters

2007-10-30 05:54:08 · 1 answers · asked by Anonymous in Engineering

2007-10-30 05:53:54 · 3 answers · asked by dwltpa 1 in Mathematics

2007-10-30 05:52:46 · 2 answers · asked by raymysterio_91 1 in Mathematics

how come I can basically read people's minds or just read a person even after I've only known them like 10 minutes? and can anyone else read minds and see my past lives or how my life will unfold I kind of have an idea of it but just want more advice and please dont say it cant be done on the internet because some other person asked the same question and got good answers. thanks

2007-10-30 05:52:46 · 5 answers · asked by Leomonade 1 in Parapsychology

I want to know if they work in boats and underrwater with sharks or if they spend more time on equations and in a desk.

2007-10-30 05:50:38 · 5 answers · asked by Sara S 1 in Zoology

Showing the statement below seems to be a cute problem (f^k denotes the k-th derivative of f). I don't have the proof yet, but I was assured by a top dog that the statement is true.

Suppose that, for some positive integer n, the function f: R->R is (n +1) times differentiable and that both f and f^(n+1) are bounded on R. Then, for every k=1,2,3.... , f^k is bounded on R

2007-10-30 05:49:58 · 2 answers · asked by Steiner 7 in Mathematics

2007-10-30 05:48:43 · 8 answers · asked by brutalhonesty 2 in Mathematics

An alpha particle (mass = 6.6 10-24 g) emitted by radium travels at 2.5 107 0.1 107 mi/h.
(a) What is its de Broglie wavelength (in meters)?

(b) What is the uncertainty in its position?

2007-10-30 05:48:37 · 1 answers · asked by jnester0289 1 in Chemistry

A particle is moving along the curve y = x^(1/2). As the particle passes through the point (4,2), its x-coordinate increases at a rate of 3 cm/s. How fast is the distance from the particle of the origin changing at this instant?

Can someone show me how to figure this out?

2007-10-30 05:47:34 · 1 answers · asked by the Jam 2 in Mathematics

I've played around with a Van de Graaff generator before in the special projects program at my school and I've seen a Tesla Coil in action at the McWane Center in Birmingham, AL. I know about the inner working of the Van de Graaff gen. Rubber belt, copper wire, steel ball, motor. Easy enough. But what about a Tesla Coil? Our school doesn't have one of those laying around for us to mess with (our science classes are very general) and I just want to know. Please don't copy something from Wikipedia. I hate that. Would someone who knows what they're talking about explain it?

By the way, I don't have a project or anything, I just love science but biology is boring me to death. This question came to me while I was watching some Tesla Coil videos on Youtube.

2007-10-30 05:47:24 · 6 answers · asked by lizzzardbreath 2 in Engineering

How fast must a 148 g baseball travel in order to have a de Broglie wavelength that is equal to that of an x-ray photon with wavelength = 100. pm?

2007-10-30 05:47:00 · 1 answers · asked by jnester0289 1 in Chemistry

Are there two ends? or Are the ends different for different people?

2007-10-30 05:46:40 · 24 answers · asked by Anonymous in Geography

how do i solve for x

3x (x+2)(x-2)=0

how do i divide this equation.
(3x – 2)(x - 4) – (x - 4)(6 – 5x) / (4 – x)(8x – 1)

2007-10-30 05:40:19 · 5 answers · asked by Anonymous in Mathematics

2007-10-30 05:38:23 · 2 answers · asked by Ben 1 in Mathematics

Country : Cuba
Population is : 11, 394,043
Growth Rate: 0.273%

Use the growth rate to approximate the population in the year 2008. Show how each of the approximations were made by including your calculations.

Example: The population of India in 2005 was 1,080,264,388. The growth rate is 1.4%
In 2006 , the approximate population is 1,095,388,089.
" 2007 is 1,110,723,523
" 2008 is 1,126,273,652

2007-10-30 05:38:07 · 2 answers · asked by yuleydis77 1 in Mathematics