Science & Mathematics - 5 September 2007

7.50 x 1000= 7500, right? so how do i apply significant figures to this? is this enough for the answer?

2007-09-05 14:12:57 · 3 answers · asked by tictac 2 in Mathematics

i need it today!! ^_^ thanks, and just give me a link would be nice or you could just tell me!!!!! thanks a bunch!!!!

2007-09-05 14:10:55 · 4 answers · asked by Jordan 1 in Biology

What is a science project I could perform that involves digital photography or video?

I am an 8th grade girl

the project must have a manipulative and a controlled variable.

manipulative variable-variable that changes

Controlled variable-variable that stays the same

THANKS BUNCHES!

2007-09-05 14:09:39 · 2 answers · asked by Sarahbelle 2 in Other - Science

for example " i sold half as many executive desks as regular desks.

2007-09-05 14:09:23 · 5 answers · asked by uthmankhan1983 1 in Mathematics

"The Net" is a purple alloy with silverish striations, i think it is copper and iron but it might also be antimony. if you know what metals to use, the ratio and the temperature let me know. Ya kind of obscure but gotta start somewhere.

2007-09-05 14:08:13 · 2 answers · asked by gleipnir76 2 in Chemistry

sorry if its a stupid question. i really need to know.

2007-09-05 14:06:15 · 10 answers · asked by Anonymous in Astronomy & Space

2007-09-05 14:05:30 · 1 answers · asked by Anonymous in Astronomy & Space

Everyone I ask can not believe it, the story also said they plan a huge dam 20 miles long to hold the waste from reaching Bristol Bay, Alaska.

2007-09-05 14:01:54 · 7 answers · asked by dani_CH 1 in Earth Sciences & Geology

I have homework where I have to find the name of the element, the atomic number, the mass number, the # of protons, nuetrons and electrons.
So I found a site that helped me with the first easy ones. But then my teacher added some more difficult ones that I don't understand. Here they are:
F-
Cl-
Na+
K+
Mg+2
Ca+2

So my questions are, do these elements have the same atomic number, and mass number? Do these elements have the same # of protons and neutrons?

From what I read on this sight, the plus sign means that this is a positively charged ion. It is positively charged because a negatively charged electron was removed from the atom. So I just want to know if I am correct in saying that Fl- has an atomic number of 9, a mass number of 19 and protons = 9 and neutrons = 10 and electrons =10?
For a negative sign am I just adding one onto the electrons and not changing any other numbers? And for the postive sign am I just subtracting one from the # of electrons??

2007-09-05 14:00:29 · 2 answers · asked by Mother of 5/Madre de 5 3 in Chemistry

the length of a rectangle garden is 2 more than 3 times the width. the perimeter is 100 ft. find the length and width?

so L=3x+2
and p=100
100=3x+2+w
i gues this im so confused?

2007-09-05 14:00:02 · 2 answers · asked by dreamz 4 in Mathematics

Can you give me step by step instructions, please?

3x^2+17x-28.9207=0

2007-09-05 13:59:38 · 9 answers · asked by Anonymous in Mathematics

( hint, 1mL = 1cm(3)

2007-09-05 13:59:34 · 7 answers · asked by Anonymous in Physics

I've been having a lot of difficulty with this 3 dimensions. Can you please help!!
Show the equation 4x^2+4y^2+4z^2-12x+3y-5z =0 represents a sphere and determine its center and radius.

Also explain why the equation x^2+y^2-2xy +5 = 0 does not represent a sphere

Lastly, Describe the region represented by the equation x^2 +y^2+z^2 - 4x +2y - 6z + a > 0 for the following values of a:

(j) a = 0 (ii) a = 14 (i) a = 20.

any help is greatly appreciated and thanks alot for your time

2007-09-05 13:56:49 · 3 answers · asked by JOE 2 in Mathematics

what would happen if you were to fly to the edge of the universe in a rocket.
would the rocket just follow the Curvature of space time and end up where it started...?..or would it break through into something different..?

2007-09-05 13:56:37 · 15 answers · asked by Anonymous in Astronomy & Space

I want to create a pair of glasses, or any type of eye wear that can somehow allow you to see whats behind you, instead of the front.

although, what would be even better is if it could see whats behind and in front of you, and can be binoculars with a switch of a button or something....

any tips? I think mirrors would do the trick, but not quite sure how to do it?!?!?

2007-09-05 13:53:48 · 1 answers · asked by Anonymous in Other - Science

A 1.1058g sample of seashell was reacted with 25.00 ml of 1.000M HCl. The excess HCl required 21.70 ml of 0.1590M NaOH for neutralization.

1. Why are the eggshells dried before they are massed?

2. Why are the eggshells crushed before they are used in the reaction?

3. As the mass of the eggshell sample increases, what will happen to the volume of NaOH solution required for the titration? Explain.


if you have any idea what the answer is, pleaseee help me! thanks!

2007-09-05 13:52:15 · 4 answers · asked by Maddi J 2 in Chemistry

if it's unplugged, can i safely handle all of the parts without worrying about getting shocked?

2007-09-05 13:50:55 · 6 answers · asked by Alex 3 in Engineering

How do you figure out if it will most likely form bonds just by knowing its atomic number?

2007-09-05 13:50:49 · 5 answers · asked by Anonymous in Chemistry

Trigonometric identity question?
Could someone pls help me with this? Thx.
The identity [(1/sin x) - sin x] is equivalent to:

A) cos x / sin x
B) tan x / cos x
C) sin x /cos x
D) 1

2007-09-05 13:49:41 · 4 answers · asked by tmlfan 4 in Mathematics

Which radiation has the lowest energy?

2007-09-05 13:47:34 · 3 answers · asked by Anonymous in Chemistry

its a math problem please help its e=mc suqared!!!

2007-09-05 13:46:53 · 4 answers · asked by Alexandrea B 1 in Mathematics

I live in central indiana. i was at my friend's house and we found a big spider about an inch and a half with a really big butt. It had a brown abdomen with white underneath, and yellow and red/black striped legs. can anyone identify this spider for me pleez?

2007-09-05 13:46:16 · 5 answers · asked by Anonymous in Zoology

If tan pheta = 1/10 what does sine pheta equal?

If cos pheta=2/square root of 10 what does tan pheta equal?

2007-09-05 13:45:23 · 3 answers · asked by Ciavana 3 in Mathematics

2007-09-05 13:43:55 · 8 answers · asked by Anonymous in Biology

2007-09-05 13:43:42 · 6 answers · asked by Sayler M 2 in Chemistry

2007-09-05 13:43:00 · 1 answers · asked by PixieStix 2 in Other - Science

http://img122.imageshack.us/img122/764/scan0001jh7.jpg

Find x, and y.

2007-09-05 13:42:39 · 3 answers · asked by Anonymous in Mathematics

why is it not useful in nuclear medicine?

2007-09-05 13:42:21 · 1 answers · asked by Buttrefly-Beauty 2 in Chemistry

2007-09-05 13:41:32 · 5 answers · asked by Autum 5 in Mathematics

2007-09-05 13:41:09 · 2 answers · asked by Sayler M 2 in Chemistry