Science & Mathematics - 13 August 2007

I understand how an antenna absorbs RF radiation at a certain frequency. What I need to know is, how does the electricity from an antenna get into a circuit? If it is just a piece of wire attached at one end, how does electricity go through it? I thought that a circuit had to be joined at both ends for electrons to go through it. Please help me understand how I could for example, charge a battery from radio waves. Thanks a bunch!

2007-08-13 14:49:30 · 6 answers · asked by Anonymous in Engineering

ok its pretty simple but i dont know wat to put on my answer sheet.

Test the number for divisibility by 2, 3, 4, 5, 6, 8,9, and 10.
1. 128 2. 432 3. 22,480 4. 638,928

2007-08-13 14:48:02 · 9 answers · asked by Anonymous in Mathematics

2007-08-13 14:45:20 · 9 answers · asked by cemuni2 1 in Astronomy & Space

An urn contains 6 red and 4 white balls. Three are drawn without replacement. If the third ball is red, determine the probability that the second was white.

And can I plz get an explanation? Thanks!

2007-08-13 14:44:49 · 5 answers · asked by Anonymous in Mathematics

(9m)^3/2

(27b)^1/3 / (9b)^-1/2

if x^3/4 = 27, what is the vaule of x?

if b^-1/2 = 4, what is the value of b?

if (2m)^-6 = 16, what is the vaule of 2^3m?


PLEASE HELP?! MY ANSWERS ALWAYS COME UP TO BE LARGE NUMBERS THAT DO NOT FIT.

best answer = 10 points! <3

2007-08-13 14:42:33 · 5 answers · asked by Anonymous in Mathematics

How do you solve this:

3 ( x + 1) = 2 ( x + 11)

- I know to use the distrubuting prop. but after the 2nd step I get confused,pleez help!


The length of a rectangle is 5 cm greater than it's width. The perimeter is 58 cm. Find the dimensions of the rectangle.

~thankz!

2007-08-13 14:41:12 · 18 answers · asked by Anonymous in Mathematics

It is a celestron powerseeker 50 with the follwoing spicefactions:
OPTICAL DESIGN Refractor
APERTURE 50 mm (1.97 in)
FOCAL LENGTH 600 mm (23.62 in)
FOCAL RATIO 12
EYEPIECE 1 20 mm (0.79 in)
MAGNIFICATION 1 30 x
EYEPIECE 2 12 mm (0.47 in)
MAGNIFICATION 2 50 x
EYEPIECE 3 4 mm (0.16 in)
MAGNIFICATION 3 150 x
BARLOW LENS 3 x
FINDERSCOPE 5x24
STAR DIAGONAL 0.92 in
MOUNT Altazimuth
TRIPOD Aluminum
CD ROM The Sky Level 1
WEIGHT 6 lb (2.72 kg)
LIMITING STELLAR MAGNITUDE 11
RESOLUTION 2.77 arc seconds
RESOLVING POWER 2.32 arc seconds
PHOTOGRAPHIC RESOLUTION 167 line/mm
LIGHT GATHERING POWER 51 x
ANGULAR FIELD OF VIEW 1.4 °
LINEAR FIELD OF VIEW (@1000 YDS) 72 ft (21.95 m)
OPTICAL COATINGS Fully-Coated
OPTICAL TUBE LENGTH 24 in (609.6 mm)
TELESCOPE WEIGHT 6 lb (2.72 kg)

2007-08-13 14:41:02 · 5 answers · asked by Anonymous in Astronomy & Space

i just want to know.. ;)

2007-08-13 14:40:32 · 1 answers · asked by yacekiih 3 in Earth Sciences & Geology

2007-08-13 14:40:32 · 7 answers · asked by ladysosureone 6 in Physics

I believe that some species might have.

2007-08-13 14:40:10 · 2 answers · asked by luv2rite 2 in Zoology

For a school assignments I have to do six precis with a partner (three each) I need to find a scientist/ professor to do with cloning that is neither for nor against cloning but is sort of sitting on the fence. Any answers would be greatly appreciated!

2007-08-13 14:36:59 · 2 answers · asked by Giraffe 3 in Other - Science

How do i explain this equation to her? My friend, i mean. She has a bit of a problem with math...

-6-3(2k+4)=18

I know its foil but she cant ver much get it. So can someone explain it in a way youd tell a say, 9 year old? I don't mean to insult you!

2007-08-13 14:36:17 · 10 answers · asked by ????????? 4 in Mathematics

I am about to buy a house that has a huge tension cable as a neighbor. I cannot find any serious information about the possible effects.

2007-08-13 14:35:01 · 5 answers · asked by jackie 1 in Physics

The atmosphere is made out of over 75% nitrogen. My question is how do humans obtain this nitrogen.

2007-08-13 14:34:41 · 4 answers · asked by techtonick.com 2 in Chemistry

I am AB-

2007-08-13 14:34:18 · 18 answers · asked by Kira 4 in Medicine

My b/f asked me out of the blue one day, "How can water get on fire?" My reply was, "The only way there will be fire on the water is if there is gas, petrol or anything chemical that can catch on fire" Maybe there is a better way of explaining this. He also asked, "So, how long can we keep the fire burning on the water?" I guess as long as there is enough gas,petrol or other chemical on the surface of the water. Am I right? Can someone please explain this science in a simple english term, thank you.

2007-08-13 14:31:50 · 3 answers · asked by Matahari 1 in Chemistry

2007-08-13 14:28:00 · 8 answers · asked by D. G 1 in Biology

2007-08-13 14:24:54 · 3 answers · asked by donutlover15 1 in Physics

y - 7 > 3 + 2y


i got -1y>10?

2007-08-13 14:24:17 · 11 answers · asked by Anonymous in Mathematics

The Mayan calender and the Book of changes (I Ching) say it will be a very bad day for humanity.
Not to mention the black hole in the middle of our universe will be directly between the earth and the sun. Are we all doomed?

2007-08-13 14:23:57 · 18 answers · asked by Anonymous in Astronomy & Space

Find an equation of the circle with center at
(-3, 5) that is tangent to the y-axis in the form of (x-A)^2+(y-B)^2=C where are constants.

A=_____
B=_____
C=_____

2007-08-13 14:23:23 · 2 answers · asked by Anonymous in Mathematics

If a group III unknown produces a pink precipitate with a basic solution of thioacetamide, which cations are probably absent?

Group III cations are Ni +2, Co +2, Fe +2, and Mn +2

2007-08-13 14:22:54 · 1 answers · asked by greensock 5 in Chemistry

2007-08-13 14:22:23 · 5 answers · asked by Gypsy Gal 6 in Earth Sciences & Geology

2007-08-13 14:12:40 · 9 answers · asked by Dreaming83 1 in Astronomy & Space

These are mah problems,I am clueless.....HOW? "^"carrot means exponent! "/" equals fraction/division.

#1 V= 3.14/3 r^2h,solve for h #2 S=L(1 - r) ,solve for r

Solve for x

#3 4/9 (x + 3) = g

#15 1/2 (x - 3) + (3/2 - x) = 5x

#18 u/5 + u/10 - u/6 = 1


I am so lost,If you can make any since of any of these please explain,thanky!

2007-08-13 14:11:01 · 3 answers · asked by None 3 in Mathematics

2007-08-13 14:05:52 · 1 answers · asked by Julie B 1 in Mathematics

Please show all work.

Thank you very much :)

2007-08-13 14:05:18 · 5 answers · asked by Elizabeth 3 in Mathematics

A friend of my mine tried ecstasy on Friday and I have only done it once, so I don't know what kind it was or what it was based with.

He said it was circular, blue and had the money sign ($) on it.

I know ecstasy is based with certain drugs like, herion, speed, coke, but I don't know too well so I was wondering if someone could tell me, and also tell me how strong the pill was? Was it good, bad, okay?

Thanks.

2007-08-13 14:05:17 · 3 answers · asked by Anonymous in Medicine

I'm currently writing a report on chicken eggs, and I was wondering about the colour of egg yolk... What affects the egg yolk colour? and what exactly is the "industry standard" as far as colour goes? If someone can link me to an internet site with this kind of info, that would be great.

2007-08-13 14:00:40 · 8 answers · asked by Anonymous in Agriculture

2007-08-13 14:00:01 · 7 answers · asked by april b 1 in Physics