Science & Mathematics - 8 December 2006

2006-12-08 16:38:34 · 1 answers · asked by Anonymous in Astronomy & Space

I keep hearing about how They proved a knot can't exist in more then 3 dimensions, or how the ricci flow was proved in the fourth and fifth dimensions, etc. But we have no direct evidence that these extra demensions exist, save that of time, or if they did how they would fit. So how can mathematicians prove laws in theoretical worlds?

2006-12-08 16:36:47 · 8 answers · asked by Curious George 1 in Mathematics

why are they both getting infected... shouldn't they counter each other

2006-12-08 16:35:39 · 10 answers · asked by legionmober 2 in Zoology

This question has 3 parts to it, here is the information for the questions:

The inventor of a new product believes that the cost of producing the product is given by the function C(x) = 1.75x + 7000. If the inventor charges $4 per unit, then her profit for producing and selling x units is given by the function P(x) = 2.25x – 7000

a) What is her profit if she sells 2000 units?
I already did this one and got -$2,500

b) What is her profit if she sells 5000 units?
I did this one as well and got $4,250

c) What is the break-even point for sales stated in the number of units?
This is the one I'm having troubles with. What is a break-even point.. and how do I find it in this scenario?

Thanks in advance.

2006-12-08 16:35:23 · 3 answers · asked by glitteringfairywings 2 in Mathematics

2006-12-08 16:34:42 · 2 answers · asked by bob k 1 in Medicine

1. A 0:32 g sample of H2O contains how many
molecules of water? Answer in units of molec.


2. How many grams do 3:6£1023 atoms of mag-
nesium weigh? Answer in units of g.


3. How many molecules of aspirin (C9H8O4) are
there in a 150 mg tablet of aspirin? Answer
in units of molec.



5. How many atoms of carbon are present in
54:8 g of a compound that is 23:3% carbon,
by weight? Answer in units of atoms.



tell me how hyou do iit or jus thte answer even.

2006-12-08 16:32:54 · 1 answers · asked by dojorno5 2 in Chemistry

I need help with this math equation and i can only solve it using the matrix method.

x + y + z = 3
3x + 3y + z = 0
x + 2y + z = 0

Please help me and explain how you did it as well, Thank you.
- solve it using matrix only.

2006-12-08 16:31:53 · 5 answers · asked by adel q 2 in Mathematics

2006-12-08 16:31:33 · 10 answers · asked by legionmober 2 in Physics

What is the order of the continents in the size variations ?

2006-12-08 16:29:21 · 16 answers · asked by Nature's fall 2 in Geography

I walked into a hundred or so year old church the other day, and beside from being beautiful on all accounts, i saw series of pipes displayed all around the church, in the tops of the walls to the left and right of the main seating area, in walls of seperate sections, and most surprisignly the mean organ device appeared to be all the way opposite these pipes over the entrance door, where another plethora of pipes were placed. This raised many questions: First, how does an organ work, Second, most of the pipes looked the same height, how do they play different notes, Third, the pipes seemed to run through solid rock columns and walls, how had they not been crushed and put out of tune by pressure, and Fourth, if one of the pipes did break, how could you possibly service or repair that if it exists within those hard and mastercrafted walls.

2006-12-08 16:29:06 · 3 answers · asked by Curious George 1 in Engineering

the differences i mean here is the potentiometer reading...highest to lowest are:rubber tubing(0.8 V), porous cup(0.3 V) and thread(0.05 V)...so what accounts for these differences? pls. be specific and better if you could state your reference...tnx a lot!

2006-12-08 16:28:59 · 2 answers · asked by angelgwen24 2 in Chemistry

2006-12-08 16:28:31 · 5 answers · asked by Anonymous in Physics

2006-12-08 16:26:59 · 2 answers · asked by blah blah 1 in Chemistry

I need to no this 4 home work

2006-12-08 16:26:11 · 11 answers · asked by beth 1 in Weather

2006-12-08 16:23:55 · 12 answers · asked by Anonymous in Astronomy & Space

-5 & -3 are under 4 & 6 all in the bracket

2006-12-08 16:23:27 · 3 answers · asked by shumonicagraham 2 in Mathematics

I'm 36, woman, and I got my geology degree at 33. I'm planning to do a two year Masters about Oil. Do you think this could make sure a job for me in an oil company?......... Thanks!

2006-12-08 16:23:21 · 4 answers · asked by Esperanza M 1 in Earth Sciences & Geology

I need 3 examples.

IT WAS A QUESTION ON MY TEST THAT I GOT WRONG

2006-12-08 16:20:14 · 6 answers · asked by Anonymous in Chemistry

i have often times wondered, what lies beyond our planet, this floating speck, what lies far, far away, is there an edge of the universe? WHat is the universe inside of? Is there a point to anything? What is the arcane truth behind all this exisence? Please, someone answer me. It may be with philosophy...it may be with science...i dont care. Will we ever find out?

2006-12-08 16:20:13 · 9 answers · asked by John Frusciante 1 in Astronomy & Space

What type of reaction is exhibited by alkenes? Why?

these question are from the experiment entitled "Hydrocarbons – Structure and Chemical Properties"
the substances used are: benzene, n-hexane, cyclohexane, kerosene and gasoline.
the test are: ignition test, baeyer's test, reaction with sulfuric acid and Br2 in CCl4

2006-12-08 16:19:01 · 1 answers · asked by blah blah 1 in Chemistry

2006-12-08 16:15:39 · 11 answers · asked by Anonymous in Engineering

2006-12-08 16:15:27 · 7 answers · asked by susheel 1 in Weather

I graphed a lot of power functions on my calculator, from X^.01 to X^2.3 to X^5, etc., and it seems between 0 and 1, where no matter what the two points are always the same, there is a bend that determines the the shape of the curve. This bend seems very defined, and it seems it must be important mathematically. I know that maximum and minimum are determined by first deriviative, and inflection points by second, is this bend point determined by third derivative. IF not, is there a way to find the exact point where the bend is the most pronounced?

2006-12-08 16:15:08 · 4 answers · asked by Curious George 1 in Mathematics

2006-12-08 16:10:36 · 3 answers · asked by HARISH KUMAR R 1 in Physics

a. sun
b. milky way galaxy
c.pluto
d.Io(one of jupiter's moons)


pls proof why you choose that letter..ty ^^.

2006-12-08 16:08:59 · 11 answers · asked by maye29 2 in Earth Sciences & Geology

2006-12-08 16:08:21 · 6 answers · asked by Anonymous in Chemistry

if so what effect do they have of ocean life

2006-12-08 16:07:53 · 11 answers · asked by ertw t 2 in Earth Sciences & Geology

If plants can can convert carbon dioxide into oxygen and release energy, and animals can convert oxygen into carbon dioxide and release energy, could those two organs came together in one creature, so that it would only need one breath, and then run the rest of it's energy off of circulating it's oxygen and carbon dioxide?

2006-12-08 16:07:53 · 4 answers · asked by Curious George 1 in Biology

What exacly, in terms that an average college student would understand, is protein synthesis? As in, where it takes place and the function of each step, etc.

2006-12-08 16:03:33 · 3 answers · asked by germainassasin 2 in Biology

An ice rescue team pulls a stranded hiker off a frozen lake by throwing him a rope and pulling him horizontally across the essentially frictionless ice with a constant force. The hiker weighs 1040 N, and accelerates across the ice at 1.35 m/s2. What is the magnitude of the tension in the rope? (Ignore the mass of the rope.)

2006-12-08 16:02:17 · 2 answers · asked by Spirit of Vengeance 2 in Physics