Science & Mathematics - 15 September 2007

i know its used for

toaster
electric fire
electric oven
light bulbs
dimmer switches


but i need more anyone know any other appliances?

2007-09-15 21:56:24 · 5 answers · asked by Anonymous in Engineering

2007-09-15 21:54:52 · 4 answers · asked by sapet 1 in Engineering

2007-09-15 21:50:30 · 12 answers · asked by tickled pink 1 in Mathematics

i really want to learn telekinesis, electrokinesis, and maybe even pyrokinesis. And I found a few sights on electrokinesis and i tried it and i felt like i just drank monster.

2007-09-15 21:33:43 · 9 answers · asked by Walter 5 in Parapsychology

what are sub-atomic particles? umm please explain in a common language (for example big for massive). thank you!

2007-09-15 21:30:09 · 4 answers · asked by SIMONE 5 in Astronomy & Space

ok, I need some help with my math homework. At the top, it says analyzing the graph of a function. Then it says for the graph f(x) below, find the indicated information. And it shows a graph with seven points on it.

and it says a) find f(0)
b) find f(2)
c) find f(-6)


so, can you tell me how to find f? Is it just a point on the x axis? Any help would be great.

2007-09-15 21:25:19 · 5 answers · asked by Coma White 5 in Mathematics

2007-09-15 21:19:35 · 1 answers · asked by gini 1 in Physics

what problems arise when we try to find the 200th term of the sequence

An+1=1+1/An

when A1=1+1
A2=1+ 1/1+1 etc.....

i can't find the problem that's supposedly there.... any help please?

2007-09-15 21:14:18 · 1 answers · asked by googleme 2 in Mathematics

What is the general equation for this type of reaction?

2007-09-15 21:14:08 · 8 answers · asked by Brigette 1 in Chemistry

For my Chemistry homework.
Please and thank you.
xx

2007-09-15 21:12:25 · 2 answers · asked by Anonymous in Chemistry

What are the sideeffects? How can I overcome/prevent these?

2007-09-15 21:11:09 · 2 answers · asked by de5tiny06 2 in Medicine

A portable CD player uses a current of 6.8 mA at a potential difference of 3 V. (a) How much energy does the player use in 41 minutes? (b) Suppose the player has a mass of 0.65 kg. How many minutes should the player operate on so that the energy can lift the CD player through a height of 1m?
(a) Energy consumed in 41 minutes is J.
(b) The time for the CD player is minutes.

I am extremely bad with physics so along with an explanation, and answer would be much appreciated! Thanks!

2007-09-15 21:10:03 · 2 answers · asked by Anonymous in Physics

It has something to do with the physiology of hearing.

2007-09-15 21:09:47 · 2 answers · asked by poppkornguy 1 in Medicine

The resistor in an RC circuit has a resistance of 181 Ω. (a) What is the capacitance must be used in this circuit so that the time constant is 2 ms? (b) Using the capacitance determined by (a) calculate the current in the circuit 4 ms after the switch is closed. Assuming that the capacitor is uncharged initially and the EMF of the battery is 9.0 V.
(a) The capacitance is ? µF.
(b) The current in the circuit is ? mA.


Im extremely bad with physics so along with an explanation, an answer would be much appreciated! Thanks!

2007-09-15 21:08:34 · 2 answers · asked by Anonymous in Physics

The picture tube in a particular television draws a current of 13 A. How many electrons strike the viewing screen every second?
?electrons/s

2007-09-15 21:03:15 · 2 answers · asked by Anonymous in Physics

2007-09-15 20:52:11 · 2 answers · asked by Anonymous in Mathematics

i'm so damn stuck..

1. Fe(s) + CuSO4(aq) --> Cu(s) + FeSO4(aq)
What mass of copper would be obtained if 1.0 kg of scrap iron was added to enough copper sulfate to react all the iron?

2. What mass of iron is produced by reacting 25g of zinc with excess iron (III) oxide according to the equation:
Fe2O3(s) + 3Zn (s) --> 3ZnO + 2Fe(s)

3. Hydrogen burns in oxygen to produce water.
(a) write a balanced equation for this reaction
(b) calculate the mass of oxygen required to react with 10.0 g
of hydrogen.


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Thanks heaps!! and just do what u could be bothered doing. much appreciated!! so are stars!

2007-09-15 20:49:08 · 4 answers · asked by jo 2 in Chemistry

The first term is x cubed. The second term is two x squared.

2007-09-15 20:43:14 · 4 answers · asked by ableego 7 in Mathematics

I have a friend who is an astrophysist at a major university and he has presented what are two opinions in the science community. One being it is and will be within the next two generations, the other being likely never. I would like to hear some other opinions from other physists and methematicians just out of curiousity.

2007-09-15 20:41:24 · 2 answers · asked by steve s 2 in Physics

2007-09-15 20:41:15 · 18 answers · asked by Grinning Football plinny younger 7 in Geography

How is the kinetic energy formula derived? From where does it derive?

2007-09-15 20:36:22 · 3 answers · asked by mehrdad_baghery 2 in Physics

Does some out there have any circuit diagram that they can share with me for my electric vehicle project or recomemd any web site to look at.

2007-09-15 20:30:00 · 2 answers · asked by Onin 3 in Engineering

2007-09-15 20:29:45 · 12 answers · asked by WA R 1 in Astronomy & Space

2007-09-15 20:27:22 · 6 answers · asked by Anonymous in Astronomy & Space

I need help on using limits to determine the behavior of the function at any discontinuity. I also need to use limits to determine the end behavior and to sketch the graph. How do I find the discontinuities, intercepts, and asymptotes of these questions?

1. f(x) = (x^3+2x^2-35x) / (x^2-x-20)
2. f(x) = (-x-3) / (2x^2+x-15)

I first factored everything. However, like #1, I got stuck after finding out that -4 was an asymptote. How should I come about finding these requirements of the problems?

Thank you!

2007-09-15 20:26:05 · 2 answers · asked by Anonymous in Mathematics

Hey, I just got multiplying part of the polynomials, and now dividing is confusing me! I don't know how to go about this. Any ideas?

One

{(12m^2n^5)/(m+5)}/{(3m^3n)/(m^2-25)}

Two

{(n^2-n-12)/(2n^2-15n+18)}/{(3n^2-12n)/(2n^3-9n^2)}

Three

{(17mn^3)/(m^2+2m-35)}/{(34m^8n^4)/(m^2+7m)}

Four

{(16-2m)/(m^2+2m-24)}/{(m-8)/(3m+18)}

If anyone can help me on how to do these it will be great! I need advice and pointers, and then i can do the rest! There are 20 of these!!

I don't know why Y! Answers cuts the equations off, but here's the link with the questions:

http://oregonstate.edu/~patelu/scan0004.jpg

Help on any one of these will be great.

HELP

thank

2007-09-15 20:25:57 · 2 answers · asked by abe_cooldude 1 in Mathematics

2007-09-15 20:25:23 · 6 answers · asked by Anonymous in Mathematics

2007-09-15 20:23:46 · 2 answers · asked by Duna 2 in Physics

2007-09-15 20:21:12 · 10 answers · asked by Anonymous in Mathematics

2007-09-15 20:08:47 · 3 answers · asked by Anonymous in Chemistry