Science & Mathematics - 23 September 2007

i hav'nt got one i just wonderd.

2007-09-23 21:57:17 · 5 answers · asked by strongbow 3 in Astronomy & Space

i.e take a rocket in space that is firing its engine, what is the propulsion propelling itself against?

2007-09-23 21:56:20 · 8 answers · asked by sicoll007 4 in Astronomy & Space

2007-09-23 21:34:13 · 5 answers · asked by unsure why 1 in Medicine

2007-09-23 21:29:30 · 10 answers · asked by Anonymous in Physics

Its 3:21 here. That means it's 4:21 in the next coast over (I think). Each coast's time goes up by an hour all the way around the world. It keeps going up an hour all the way around. So if you could travel at the speed of light around the world, in the direction that the coasts' time increse, would you go forward, faster in time?

2007-09-23 21:26:38 · 15 answers · asked by bartman2d 1 in Astronomy & Space

Now no super maths here.
Just Define energy..
And what it is made of...

2007-09-23 21:19:30 · 11 answers · asked by Anonymous in Physics

The big bang has been proven. The Wmap satellite orbiting Earth has already taken images of the big bang in its infancy, roughly 370,000 years after its birth. How about we just accept it being that it has been shown true. I'm sick of hearing people talk about how the big bang is ludicrous, ITS NOT!

2007-09-23 21:10:57 · 15 answers · asked by Anonymous in Astronomy & Space

When it is naturally occuring in nature (sun, stars, etc)

2007-09-23 21:10:38 · 4 answers · asked by ap_152 1 in Chemistry

2007-09-23 21:05:20 · 4 answers · asked by endzone 1 in Zoology

As far as I know artery carries pure blood - it braches into arterioles - it reaches cells - arterioles divide into fine capillaries- interact with cells- provides oxygen , take CO2 and other waste materials out. Then this capillaries join to make larger vessel known as vein -veins carry waste materials , CO2 etc.
But I have recently learned that the renal arteries do contain waste materials and they are filtered via neprons located at two kidneys.
Now my question is, how are this waste materials get into artery blood which(artery) is not supposed to interact with any cells?
Please help!!

2007-09-23 20:51:30 · 7 answers · asked by Anonymous in Biology

A. allele

B.gene

C. chromosomes

D.factor

2007-09-23 20:50:40 · 2 answers · asked by Wolrd_gansta 1 in Biology

2007-09-23 20:50:33 · 4 answers · asked by Anonymous in Biology

A The tilt of the Earth’s axis constantly changes between 0 and 23.5 degrees, giving us summer when the Earth is tilted more and winter when it is straight up.
B As the Earth goes around the Sun and the Earth’s axis remains pointed toward the North Celestial Pole, the Northern and Southern hemispheres alternately receive more and less direct sunlight.
C The Earth’s distance from the Sun varies, so that it is summer when we are closer to the Sun and winter when we are farther from the Sun.
D Seasons are caused by the periodic changes in the Sun’s surface temperature. When the temperature is highest, we have summer. When the temperature is lowest, we have winter.
E Seasons are caused by the influence of the planet Jupiter on our orbit.

2007-09-23 20:50:05 · 10 answers · asked by fundamentalz27 1 in Astronomy & Space

A Jupiter will be to the West from the celestial meridian.
B Jupiter will again be on the celestial meridian.
C Jupiter will again be on the celestial meridian but more to the South from its position 3 months ago.
D Jupiter will be to the East from the celestial meridian.
E Jupiter will again be on the celestial meridian but more to the North from its position 3 months ago.

2007-09-23 20:48:36 · 1 answers · asked by fundamentalz27 1 in Astronomy & Space

2007-09-23 20:11:12 · 5 answers · asked by Kayleigh 3 in Geography

2007-09-23 20:09:48 · 3 answers · asked by mr. nice and slow 1 in Engineering

AT89 is a series of microcontrollers made by ATMEL . it belongs to the 8051 family of microcontrollers .
i am using one of the microcontroller of this series and want this databook in ebook format , free of course , so that it can help i my project work .

2007-09-23 20:09:25 · 1 answers · asked by ravi k 1 in Engineering

2007-09-23 20:08:45 · 26 answers · asked by Life goes on... 6 in Paranormal Phenomena

Two pipes are bound tightly together with a very thin wire as in the diagram. The radii of the pieces are 2in and 6in. Neglecting any practical allowance for security (meaning only wrapped once), determine the minimal length of the wire.

i tried my best to do the diagram and upload it here, its rough but i think you can get the general idea. could someone please help me with it?

http://www.imagehosting.com/show.php/1174338_circle2.GIF.html

2007-09-23 19:51:37 · 3 answers · asked by Dancerx 4 in Mathematics

This learning centre has computer rooms, theatre halls, meeting rooms, and so on. It functions as an engineering multimedia library.

No description is available for "small electrical workshop" so some ideas would be great. THANKS!

2007-09-23 19:27:37 · 2 answers · asked by s3an_looi 1 in Engineering

our professory wants us to use ((x+h) -f(x))/h but anything will help

2007-09-23 19:21:53 · 6 answers · asked by stefankims 1 in Mathematics

tell me that?

2007-09-23 19:18:28 · 5 answers · asked by Anonymous in Zoology

4GB (GB = 10^9 bytes)
MP3 player dimensions: 32mm X 24mm X 2.1mm

how many bytes of memory are stored in a cube whose sides are 100 micrometers?


so i understand that there is a total of 4.0X10^9 bytes in the entire mp3 player. there is also 10X10^6 micrometers cubed for each cube. i believe i should convert the total volume to micrometers, then divide the total volume by the volume of 1 cube. once i have that value, it should provide the total number of boxes. if that's correct, then i should be able to divide that value by the total number of bytes... but it's not workin' out.

someone please help me =)

2007-09-23 19:06:58 · 2 answers · asked by dBug 2 in Mathematics

how is a 3 months weather forecast made?
methods of conducting a weather forecast

2007-09-23 19:06:16 · 16 answers · asked by dem 1 in Weather

Given the curve with parametric equations x= t^2 - 1, y= 1-t^3, z=1-2t+t^2

Does it pass through the point A(3,-7,1)?

2007-09-23 19:04:52 · 5 answers · asked by km1988 1 in Mathematics

Let L:R^2 ------> R^2 be a linear transformation such that
L(i+2j) = -2i+3j and L(i - j) = 5i+2j
a)Determine the matrix representing the linear transformation
b) Determine the value of L(7i+5j)

please help me :(

2007-09-23 19:02:32 · 2 answers · asked by Anonymous in Mathematics

2007-09-23 19:02:29 · 2 answers · asked by Anonymous in Earth Sciences & Geology

I have a 1/6 scale dune buggy and i would like to mount it in the back of my 4x4 so i can remove it with the flick of a switch.I would like to use an electromagnet but i dont want to damage the electronics in the RC car.Help!

2007-09-23 18:58:14 · 2 answers · asked by isaacchef 3 in Engineering

2007-09-23 18:52:34 · 1 answers · asked by Anonymous in Engineering

An Avian Biologist studying a species of parakeet in Australia noticed that in the wild the parakeets had either red or green tail feathers. After many crosses the scientist obtained a true breeding red individual and crossed it to a second true breeding red individual that she had obtained in a separate series of crosses. Much to her surprise when the F1 progeny were obtained all of the birds were green. She then self crossed the F1 birds with the following results: 45 green birds and 35 red birds. After seeing these results she thought she understood what was going on but continued crossing F1 birds over the next year and obtained these results: 921 green birds and 704 red birds.

What mode(s) of inheritance are demonstrated by the above crosses? How many genes are involved?





What were the genotypes of the original true breeding red stocks and the green progeny?














Why was it important to continue crossing F1 birds over the course of that year instead of relying only on the original results?
15 minutes ago - 3 days left to answer.

2007-09-23 18:49:10 · 1 answers · asked by Anonymous in Biology