Science & Mathematics - 9 September 2007

2007-09-09 23:45:33 · 1 answers · asked by angelacute_girl 1 in Chemistry

Hello folks!

How can i solve this quadratic equation using the QUADRATIC FORMULA?

5x^2+13x -6=0

I tried doing it but i got stuck on the way....

2007-09-09 23:40:56 · 9 answers · asked by Anonymous in Mathematics

a)2x^4-4x^3-3x^2-x-3=0
b)6x^4+5x^3-x^2+x+1=0
c)x^4-3x^3+3x^2+x-6=0
d)2x^4+3x^3-3x^2+4=0

2)How do you graph polynomial functions like this:
a) f(x)=-x^3+2x^2+4x-8
b)f(x)=x^3-6x-9

2007-09-09 23:27:58 · 1 answers · asked by Boxster 2 in Mathematics

Question 5
Liyana made the following notes when she observed organisms A,B,C and D in a particular ecosystem:
A grows well only if it can find a spot on B. As A grows, B also grows. B and C will reproduce only if D is present. When B reproduces, A and will die. C feeds on D, and D feeds on B.

Which of the organisms, A, B, C or D, is the parasite in this ecosystem?

Pls submmit your answers by 6.30pm. Thank you for your help.

2007-09-09 23:25:49 · 2 answers · asked by danieltay93 3 in Physics

1. A closed box, whose length is twice its width, is to have a surface of 192 square inches. Find the dimensions of the box when the volume is maximum.

2. What number exceeds itself by the maximum amount?

2007-09-09 23:20:50 · 1 answers · asked by trevor 1 in Mathematics

2007-09-09 23:15:18 · 3 answers · asked by najeeb alarefi 1 in Weather

What is the percentage...
I earn £200 per day, and out of te £200 i have to give my partner £60. What percentage (%) does my partner recieve.

Thanks..

2007-09-09 23:15:07 · 27 answers · asked by Anonymous in Mathematics

2007-09-09 23:12:44 · 2 answers · asked by *Angel* 1 in Earth Sciences & Geology

How clean is water that comes from the rain

2007-09-09 23:10:30 · 13 answers · asked by eacard 1 in Weather

Sometimes science is straightforward - you can just measure data to support your case eg toss a coin and count it and you can show head/tails is roughly 50/50.

Sometimes it is about having a theory that explains the data and slowly building on this case so that the scientific community accepts it as the most likely explanation. If your case it strong enough it almost becomes accepted as 'fact'.

An example is evolution - the fossil record, mutations in genes and observation of microbial evolution all support it as the most likely explanation.

However Creationists would say that God fits the same purpose, a single unifying theory that explains all the observations.

Philosophically how can you differentiate between these two?

2007-09-09 23:09:25 · 16 answers · asked by James T 3 in Biology

You can spin the egg. Since viscosity is a measure of a liquid's resistance to shear forces, seeing how the egg resists spinning (or continues to spin after you stop it) will tell you something about its viscosity. A thin yolk will continue to spin after you stop it because the inner yolk continues to spin even though the outer layers are stopped. As the inner yolk spins, it applies a shear force to the outer layers, which eventually cause the egg to spin again. A very viscous yolk (say, a hard boiled egg) resists shearing altogether, and the inner yolk stops when you stop it, so there is no spinning afterwards.

2007-09-09 22:41:59 · 3 answers · asked by physics maniac 2 in Physics

could someone tell me what it represents please?

2007-09-09 22:22:46 · 5 answers · asked by BFCP 3 in Astronomy & Space

2007-09-09 22:19:21 · 0 answers · asked by aloke dg 1 in Medicine

To all you top contributors, answer honestly.

Around how many percent of the questions asked in math do you guys think you can answer?

Just interested to know.

2007-09-09 22:16:31 · 7 answers · asked by Axis Flip 3 in Mathematics

Question Details: i've been taking a tablet (10mg) every other day for 2 weeks, and not taken one at all now for 5 days, but over the last 2 days i've felt really light headed, dizzy and tingly. is this normal? i know i had some strange side effects when i started on them, but is it the same when i come off?

also, i've been a bit weepie the last few days, without feeling depressed... another side effect?

2007-09-09 22:15:13 · 8 answers · asked by very_slightly_drunk 2 in Medicine

That's the one part of my project I can't seem to figure out, but more generally, how would I figure out the measurements to construct an 8-foot-wide concave semi-globe using 24 flat, long, bendable panels that are 3/16" thick? I know that the panels will be 12.56 feet long, and I know they will be 0.523333 feet wide in the middle, but they taper off at a curve until they have zero width at the poles. I need to figure out the width of the panels at each increment, such as every 12 inches, or maybe at 10%, 20%, and so on. Any takers?

2007-09-09 22:14:28 · 2 answers · asked by Artisphere27 1 in Engineering

a regular tetrahedron is a three-dimensional object that has four faces, each of which is an equilateral triangle. Each of the edges of such an object has a length L. The height H of a regular tetrahedron is the perpendicular distance from one corner to the center of the opposite triangular face. Show that the ratio between H and L is H/L = sqrt 2/3.
Please help if you can. Answers only are great but they don't help come test time. Can anyone break this down in understndable terms?? All help is appreciated!! Thanks!

2007-09-09 22:12:08 · 2 answers · asked by Curt 2 in Physics

A cart with mass 19.5 kg is intitally at rest. You get it moving by pushing on the cart at an angle of θ = 33.9° from above the horizontal. The magnitude of your force as a function of time is given by: Fyc(t) = Foe-b t, where b = 0.46 s-1 and Fo = 141.6 N. You can assume that the wheels on the cart are good enough that you can neglect friction between the cart and ground.
What is the speed of the cart when t = 4.7 s?

I know that i need to use newton's second law. I worked on it for hours, but can not get it. please help. Thank you so much.

2007-09-09 21:57:38 · 3 answers · asked by moonlightNY 1 in Physics

Arithmetic means are inserted between 12 and 36 so that the sum of the first three means is to the sum of the last three means as 3:5. How many means are inserted?

2007-09-09 21:51:07 · 2 answers · asked by Anonymous in Mathematics

2007-09-09 21:46:01 · 3 answers · asked by g 2 in Mathematics

2007-09-09 21:44:18 · 3 answers · asked by Anonymous in Engineering

2007-09-09 21:38:50 · 2 answers · asked by g 2 in Mathematics

Suppose, for example, you have two x-intercepts and two y-intercepts. They're not additive inverses of each other. Is there a way to find the center and radius? Best answer will have a complete explanation.

2007-09-09 21:31:55 · 4 answers · asked by Timothy H 4 in Mathematics

2007-09-09 21:22:09 · 3 answers · asked by nobelprize_geetha 1 in Earth Sciences & Geology

A cart with mass 19.5 kg is intitally at rest. You get it moving by pushing on the cart at an angle of θ = 33.9° from above the horizontal. The magnitude of your force as a function of time is given by: Fyc(t) = Foe-b t, where b = 0.46 s-1 and Fo = 141.6 N. You can assume that the wheels on the cart are good enough that you can neglect friction between the cart and ground.
What is the speed of the cart when t = 4.7 s?

I know that i need to use newton's second law. I worked on it for hours, but can not get it. please help. Thank you so much.

2007-09-09 21:04:26 · 1 answers · asked by moonlightNY 1 in Physics

http://farm2.static.flickr.com/1059/1353556555_27ebe0af87_b.jpg

It's about the size of a half dollar when it's legs are spread out. The pattern on the back looks skeletal to me. It kind of looks like a mushroom too.

Thanks for any help!

2007-09-09 20:57:13 · 4 answers · asked by ? 2 in Zoology

and thought there was someone in the room or sitting on the bed breathing into your ear .then you try to move to get up but you cant.then after a few long seconds it goes away and no ones there. its realy scary and it realy feals like your about to be murdered or something.its happened to me loads of times.what is it?id like to know if anyone else has experienced this and what did you do.

2007-09-09 20:55:20 · 26 answers · asked by muse 32 2 in Paranormal Phenomena

Find the equation of the plane that passes through (-1,2,0), (2,0,1) and (-5,3,1)

2007-09-09 20:51:59 · 2 answers · asked by Anonymous in Mathematics

The no load voltage in the voltage divider circuit shown below is 20 V. The smallest load resistor that is ever connected to the divider is 48 kilo ohms. When the divider is loaded, V0 is not to drop below 16 V.
a) Design the divider circuit to meet the specifications just mentioned. Specify the numerical value of R1 and R2
b) Assume the power ratings of commercially available resistors are 1/16, 1/ 8, 1/4, 1, and 2 W. What power rating would you specify?

http://img466.imageshack.us/img466/236/gtuw0.jpg
please help me, i'd be grateful forever!!!!

2007-09-09 20:49:29 · 5 answers · asked by Anonymous in Engineering

A block is resting on a ramp. You can change the inclination angle (theta) by raising one end of the ramp. The block has a mass m = 9.5 kg. At the interface between the ramp and the block, the coefficient of static friction is ms = 0.45, and the coefficient of kinetic friction is mk = 0.315.
If you raise the end of the ramp very slowly so that you can assume a = 0 for the block, at what angle will it slip?

Also,If it slips at that angle, what will the magnitude of its acceleration be?

And, if you can, How long does it take from the time it slips to travel a distance d = 0.90 m down the ramp?

Thank you so much.

2007-09-09 20:14:02 · 3 answers · asked by moonlightNY 1 in Physics