Science & Mathematics - 8 October 2007

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2007-10-08 13:21:10 · 1 answers · asked by Anonymous in Mathematics

Determine the maximum perimeter of a rectangle inscribed in a parabolic arch modeled by the equation y = 7 - 3x^2 so that the base of the rectangle is along the x-axis.

I have no idea what this problem is asking. Any help?
I don't need the answer, just help on getting it started.
(What is parabolic arch?)

2007-10-08 13:15:24 · 3 answers · asked by bucknell 2 in Mathematics

2007-10-08 13:13:49 · 1 answers · asked by erica w 1 in Mathematics

if u can add da source u got it from if u got it from any source

2007-10-08 13:13:47 · 2 answers · asked by NaNa 1 in Weather

2007-10-08 13:12:03 · 4 answers · asked by Anonymous in Physics

High-voltage power lines are a familiar sight throughout the country. The aluminum (resistivity = 2.82 x 10^-8 Ohm *m) wire used for some of these lines has a cross-sectional area of 4.4 x 10^-4 m^2. What is the resistance of 12 kilometers of this wire?

2007-10-08 13:10:37 · 2 answers · asked by Anonymous in Physics

2007-10-08 13:10:31 · 9 answers · asked by ridgerat01 1 in Chemistry

2007-10-08 13:10:02 · 5 answers · asked by marilinda ♥ 1 in Earth Sciences & Geology

Rutherford's alpha scattering experiment showed that most alpha particles directed toward a thin metallic foil passed through with only slight deviations. From this evidence we can coclude that
1. mass of the atom is concetrated in a small area
2. alpha particle are uncharge
3. foil too thin
4. alpha particle is type of light should not be deflect

2007-10-08 13:09:52 · 2 answers · asked by Anonymous in Chemistry

What's the difference of polarity between water (H20) and isopropyl alcohol (C3H8O)?

2007-10-08 13:08:57 · 2 answers · asked by Anonymous in Chemistry

2007-10-08 13:07:56 · 5 answers · asked by triniking08 1 in Earth Sciences & Geology

I'm stuck on this one.

(16b^-2c)(25b^4c^-5)
------------------------------
(15b^5c^-1)(8b^-7c^-2)

2007-10-08 13:06:48 · 3 answers · asked by Anonymous in Mathematics

sucrose------------> glucose + fructose ??
sucrase

what are the reactants and the products? what is the type of chemical bonding and reaction?
and what is the function of the enzyme?

2007-10-08 13:05:34 · 2 answers · asked by Mario F 1 in Chemistry

The problem is: Solve for X:

(x+1)^2 (x-3)^2 (x+3)^2 - (x+1)^3 (x-3)^2 (x+3)^2 = 0


Would the (x-3)^2s and the (x+3)^2s just cancel leaving (x-1)^2 - (x+1)^3??

Where do I go from there??

2007-10-08 13:05:10 · 3 answers · asked by beans1196 1 in Mathematics

Anyone know???

2007-10-08 13:04:55 · 6 answers · asked by Anonymous in Mathematics

2007-10-08 13:04:18 · 15 answers · asked by Anonymous in Physics

Help. :(

2007-10-08 13:01:30 · 7 answers · asked by xy z 1 in Mathematics

A 3.40 kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.410. Determine the kinetic frictional force that acts on the box for each of the following cases.
(a) the elevator is stationary
___N
(b) the elevator is accelerating upward with an acceleration whose magnitude is 1.40 m/s2
___N
(c) the elevator is accelerating downward with an acceleration whose magnitude is 1.40 m/s2
___N

2007-10-08 13:01:15 · 1 answers · asked by Marianna E 1 in Physics

It's well established that it takes an amount of time (about 3 minutes) for a photon to reach the earth from the sun. Relativity says that as an object approaches the speed of light that time, for the object, slows. So it follows that a photon leaving the sun at t=0 arrives at the earth at t=0. This is contradicted obviously by observable evidence. How is this so?

2007-10-08 12:59:18 · 4 answers · asked by Anonymous in Physics

2007-10-08 12:58:47 · 16 answers · asked by Anonymous in Paranormal Phenomena

2007-10-08 12:58:36 · 3 answers · asked by linqs 1 in Engineering

What would

y = -x
y = -x - 4

We're learning to find the distance between parallel lines. My teacher tells us to pick of the y's and she always does the top one, but it's just -x how would that work?

2007-10-08 12:56:12 · 3 answers · asked by LoverNotFighter91 1 in Engineering

____ are unstable at surface temperatures and break down into clay.

I cant find the answer in any of my notes or the website for the course =(
I was thinking either 'igneous' or 'metamorphic' or I'm not sure if the teacher wanted something more like 'olivine' or something like that.

ideas??
thanks!

2007-10-08 12:52:21 · 1 answers · asked by Sarah 2 in Earth Sciences & Geology

Also what is the difference between evolution and speciation? And, what is the difference between natural selection and descent with modifications?

2007-10-08 12:52:14 · 1 answers · asked by Anonymous in Biology

(y/x)+(x/y)=2y

2007-10-08 12:51:40 · 2 answers · asked by Mr. Vill 1 in Mathematics

can anyone explain the process of identifying minerals to me?

2007-10-08 12:51:18 · 2 answers · asked by JoAnna 2 in Earth Sciences & Geology

2007-10-08 12:50:22 · 2 answers · asked by spideredu 1 in Engineering

Has anyone ever lived and or worked in a place that was haunted. I have lived in a few, what are your experiences? Is it possible to communicate with these ghosts/spirits?

2007-10-08 12:48:32 · 9 answers · asked by Yahoo Sucks 5 in Paranormal Phenomena

Okay so just a few things...
I cant seem to figure this out: Species is to population, population is to community and ect all the way up to biosphere.

Also,2 types of fermentation..

And, Macromolecules and their monomers.

Thanks for the help!

2007-10-08 12:47:04 · 1 answers · asked by Random Girl 4 in Botany

A ladder 10 ft long rests against a vertical wall. If the bottom of the ladder slides away from the wall at a rate of 1 ft/sec, how fast is the top of the ladder sliding down the wall when the bottom of the ladder is 6 ft from the wall?

2007-10-08 12:46:58 · 2 answers · asked by Anonymous in Mathematics