Science & Mathematics - 2 November 2007

Can you explain why US official time is about 8 minutes different from Internet time even though the source for both measures is the National Institute of Standards and Technology?

2007-11-02 06:47:15 · 12 answers · asked by Starte Christ 4 in Other - Science

2007-11-02 06:46:51 · 4 answers · asked by Strike 2 in Medicine

I have no idea what to call this so I can't look it up... I need to know what this is called and how to solve it if possible:

Consider the function f(x)=x^2-9x

a)Find (F○F)(5)
b)Find (F○F○F)(-1)

Solutions:
a)580
b)10

2007-11-02 06:46:47 · 5 answers · asked by soispasignunt 2 in Mathematics

2007-11-02 06:44:17 · 14 answers · asked by meeeeee 1 in Biology

I tried asking this is Society and Cluture, but no one understood it i dont think... so here i am!

Its a little known fact that Nikola Tesla invented a machine which would draw power out of the naturally occuring electric feilds of the earth and be able to send it wirelessly through the ground at almost any distance and with the capacity to send huge amounts of power this way. (Google patent search "Apparatus for transmitting electrical energy" by Nikola Tesla 1914). the only reason it didnt happen is because Thomas Edison insisted on using the wire system so that they could sell power by usage. This philosophy has lasted until this day, and very few people are aware of the alternative possibilities.

how would history have been different if free electric power were implemented in the 1910's? How would the world change today if we built enough of them to power the whole world?

btw, this machine is NOT a fake, it was tested and confirmed. if you want more info on workings, ask

2007-11-02 06:42:43 · 2 answers · asked by nacsez 6 in Physics

Using the 3-4-5 method if I measured out 18 feet on one side of the angle and 24 feet on the other angle, if the 3rd side equals to 30 will the corner be square? all three numbers being a multiple of 6. I kinda understand using smaller numbers like 12, 3x4=12 and 16, 4x4 =16 and 20 5x4=20 but I'm confused when using larger numbers. This builder use 26, 28, 35 how does that work. the corner I'm trying to measure is 26'10" by 30'10 " a little bit bigger than the acual foundation.

2007-11-02 06:40:38 · 4 answers · asked by kim s 1 in Engineering

& what is it's elevaton?

2007-11-02 06:40:35 · 5 answers · asked by bailaen_ny 2 in Geography

2007-11-02 06:38:06 · 5 answers · asked by Maro 1 in Geography

need to solve for a b and c. How do i do this

2007-11-02 06:38:01 · 5 answers · asked by Anonymous in Mathematics

AND why does mixing a strong acid with water make so much heat

2007-11-02 06:36:24 · 3 answers · asked by aghh. 4 in Weather

Im trying to work out the stress of a fishing line after connecting a fishing line to a pulleyboard and adding 100g weights one at a time onto the fishing line to create strain and stress.

I know the formula is Stress = Force divided by area

And i have already worked out the force acting on the fishing line for each 100 gram weights which are added. If i have done this right it is 0.1 (100 g) multiplied by 9.81 (gravity) to give 0.981.

Also i have the diameter of the fishing line as 35 microns (3.5 x 10 to the power of -5)

So the area of the cross section of the circular fishing line is needed and then needs to be multiplied by the length of the fishing line which is 1.2 metres.

Can anyone help me out with this please?

Thank you so much

2007-11-02 06:32:13 · 2 answers · asked by Anonymous in Physics

2007-11-02 06:29:56 · 20 answers · asked by jose l 1 in Mathematics

a. magnetic fields.
b. liquid outer cores.
c. a magnetosphere

2007-11-02 06:27:10 · 3 answers · asked by Anonymous in Earth Sciences & Geology

What are the basic things I need to know before I start to learn geometry? I want to teach myself, which I know is hard, so I can further my studies in calculus. I'm trying to learn all of the foundations. Can someone give me some tips to making my learning by myself effective.

Thank you

2007-11-02 06:26:42 · 4 answers · asked by Luvon 3 in Mathematics

F is a function with exponential decay. Explain why function G defined by g(x) = 1/F(x) is a function with exponential growth?

2007-11-02 06:20:57 · 2 answers · asked by ngathile 2 in Mathematics

2007-11-02 06:20:15 · 4 answers · asked by Anonymous in Zoology

how is it created, how is it form how long does it last? what is a falling star?

2007-11-02 06:20:10 · 6 answers · asked by vay 1 in Astronomy & Space

I heard a giant bird comes and drops it of in front of your door.

Or are they made in a factory?????

2007-11-02 06:18:30 · 10 answers · asked by lalalalala 1 in Zoology

how would i find the second antiderivative of a function using a ti 89

2007-11-02 06:15:43 · 2 answers · asked by programhelp 2 in Mathematics

2007-11-02 06:12:33 · 3 answers · asked by strawberrygirl 3 in Mathematics

2007-11-02 06:12:33 · 2 answers · asked by mansa j 2 in Physics

2007-11-02 06:12:06 · 15 answers · asked by Joe C. 3 in Mathematics

Aside from Kasamba? That site is a hidden charge rip-off.

Or does anyone do them? I have a couple of questions.

2007-11-02 06:09:57 · 12 answers · asked by Smokella v2.0 2 in Parapsychology

need help please

2007-11-02 06:08:52 · 4 answers · asked by Kitkat 1 in Mathematics

2007-11-02 06:07:20 · 5 answers · asked by Rupinder G 1 in Chemistry

are located, it also had music playing on it???

2007-11-02 06:00:41 · 16 answers · asked by ((LOON)) 6 in Astronomy & Space

Find maximum value of f(x) = -5x^2-10x+6

Solve x^2 = 4x by graphing and indicating the roots

solve x^2 + 2x = -2 by graphing and indicating the roots

If you could explain how to do these too that would be great so I would know how to work it out when it comes to the test, I read my book but I just don't get how to do it.

2007-11-02 05:58:10 · 6 answers · asked by ehrlich 6 in Mathematics

30.2 g of glycerine (C3H8O3) are dissolved in
150 g of water. What is the boiling point of
the solution? (Kb of water = 0.515±C/m)
1. 103.52±C
2. 100.10±C
3. 1.13±C
4. 101.13±C
5. 0.104±C
02

2007-11-02 05:55:14 · 1 answers · asked by uwannadonkey 2 in Chemistry

Can someone explain to me how I do this?
I have to graph this inequality

y > –2(0, -2) and (2, 0)

Also, I think that if I end up with a greater than symbol I shade above the line, and a less than symbol means to shade it below the line. Is this correct? Thanks

2007-11-02 05:52:16 · 1 answers · asked by smiley 1 in Mathematics

A satellite of mass 220 kg is launched from a site on Earth's equator into an orbit at 180 km above the surface of Earth.
(a) Assuming a circular orbit, what is the orbital period of this satellite?
s
(b) What is the satellite's speed in its orbit?
m/s
(c) What is the minimum energy necessary to place the satellite in orbit, assuming no air friction?
J

2007-11-02 05:49:12 · 1 answers · asked by Anonymous in Astronomy & Space