Science & Mathematics - 7 January 2007

and why do we hear the sound?

2007-01-07 02:18:36 · 9 answers · asked by Chris91 2 in Physics

2007-01-07 02:16:57 · 8 answers · asked by Anonymous in Physics

2007-01-07 02:15:55 · 4 answers · asked by Anonymous in Engineering

2007-01-07 02:14:53 · 1 answers · asked by Anonymous in Engineering

2007-01-07 02:14:51 · 6 answers · asked by goring 6 in Biology

a) Dirt.
b) Ice.
c) Meteors.
d) Clay.

2007-01-07 02:13:46 · 5 answers · asked by Anonymous in Astronomy & Space

2007-01-07 02:11:47 · 6 answers · asked by Anonymous in Earth Sciences & Geology

1. An area where there is an absence of matter is called?
2.What is the name for the place where the edge of a body of water meets the land?
3.A type of arctic community having only small plants,which is found north or the tree line and above it is known as....?
4. What is the way heat moves through empty space?
5.When wood turns into stone, it is said to have...?
6.The flap that prevent food from entering the windpipe during swallowing is called what?
7.Bees that lay eggs are..?
8.The ability of an object to pick up energy waves of its own natural frequency is called what?
9. A condition caused by slow dehydration of frozen food?
10. The living and nonliving things that surround and organism are called what?
11.What is the term used to describe animals that are awake durring the day?
12 What are the twelve background constellations or stars thruogh which the sun,moon, and planets, pass every year?
13.What are two areas of radiation surrounding the earth?

2007-01-07 02:11:24 · 3 answers · asked by lov2surfbabe 1 in Botany

2007-01-07 02:10:10 · 13 answers · asked by tony_ 0 2 in Astronomy & Space

2007-01-07 02:09:37 · 4 answers · asked by dr_ardalan_uk 1 in Engineering

2007-01-07 02:09:26 · 4 answers · asked by yo yo ma 2 in Physics

2007-01-07 02:07:57 · 6 answers · asked by goring 6 in Physics

2007-01-07 02:05:39 · 11 answers · asked by harry t 1 in Biology

2007-01-07 02:02:36 · 1 answers · asked by festusky 1 in Earth Sciences & Geology

and how did alfred wagner account for these observations?

2007-01-07 02:02:27 · 2 answers · asked by Anonymous in Earth Sciences & Geology

2007-01-07 02:00:35 · 14 answers · asked by majedehseyyedi 1 in Earth Sciences & Geology

i have a math promblem whats 12 times 10089

2007-01-07 01:59:47 · 25 answers · asked by adam h 1 in Mathematics

i connected the two-pins of an electric fan to a voltmeter. when i rotated its wings, it showed 200V AC at peak.when i touched the ends of the two-pins and rotated it, it gave shock. what can be done with the voltage generated? can this be used to light a bulb?? can this be used to charge a battery?
can this be converted to DC to light a 3V bulb used in torch??
please help

2007-01-07 01:55:26 · 4 answers · asked by crazymetal 1 in Physics

2007-01-07 01:54:32 · 5 answers · asked by sarah 1 in Zoology

2007-01-07 01:54:19 · 11 answers · asked by dainty 1 in Chemistry

She had bruises on her hands and arms from drawing blood.

2007-01-07 01:53:59 · 6 answers · asked by ¡El lobo del norte del fuego! 1 in Medicine

A monochromatic light source provides 5 W of light of wavlength 4.40 x 10 ^ -7 m

This light falls on a clean potassium surface and liberates 3.2 x 10 ^ 11 photoelectrons per second.

The photoelectrons are collected by an electrode just above the metal surface and the photoelectric current measured.

Charge of Electron = 1.60 X 10 ^ -19 C

Speed of Light In Vacuum = 3.00 x 10 ^ 8 m/s

Explain whether or not photoelectorns would be emitted if a 20W source operating at a wavelength of 6.00 x 10 ^ -7m were used to be used.

The threshold frequency is 5.46 x 10 ^ 14 Hz

2007-01-07 01:53:19 · 1 answers · asked by Phlow 7 in Physics

If a bolt is rated with a tensile strength 10,000 psi and it is tightened to a force of 5,000 psi, how much pressure can tha bolt hold back? Is there a chart or a easy to use definitive guide available?

2007-01-07 01:51:51 · 2 answers · asked by BOB R 1 in Engineering

The kind I found only absorb humidity and do not readily absorb and expand when soaked in water

2007-01-07 01:51:24 · 1 answers · asked by Anonymous in Chemistry

please explain in simple english. do not explain the structure of apophysis of female cone. i want to cone this structure in female cone.

2007-01-07 01:50:22 · 1 answers · asked by rajeev sharma great 1 in Botany

to stop the threat of the world flooding due to climate change?

2007-01-07 01:46:59 · 2 answers · asked by happytaffy 4 in Earth Sciences & Geology

Like whta are the lowest common factors of 625 and 30

2007-01-07 01:40:35 · 11 answers · asked by jennifer yi 1 in Mathematics

you know how mammals give milk to their children,but do marsupials do the same?

2007-01-07 01:40:25 · 7 answers · asked by Anonymous in Zoology

When the age of the universe was - say - equal to Planck time, it was obviously below Schwarzschild's radius. Then why didn't it collapse back under its own gravity as any well-behaved black hole? I thought only Hawking's radiation could escape a black hole. In this case a whole universe did!

2007-01-07 01:40:21 · 3 answers · asked by bestalexguy 2 in Astronomy & Space

2007-01-07 01:39:21 · 18 answers · asked by Anonymous in Mathematics