Science & Mathematics - 18 October 2006

my nephew is doing an experiment on how different acids affect teeth. We are going to use egg shells for teeth. How do they compare to each other. Don't just say calcium because I know that
Queastion is for people who know what they are talking about

2006-10-18 16:32:14 · 6 answers · asked by kristina n 2 in Biology

3x+5/5x-3 - 5x-3/3x+5 over 5x-3/3x+5 - 3x+5/5x-3

If you can solve that, that would be great lol.

2006-10-18 16:30:45 · 5 answers · asked by severedangel1776 1 in Mathematics

Knowing the time of flight, the initial velocity in the x direction, and the final velocity in the y direction, how do i find the impact velocity ?(whatever that is)

2006-10-18 16:30:14 · 4 answers · asked by bep 2 in Physics

2006-10-18 16:26:05 · 25 answers · asked by Melanie B 1 in Geography

I have no clue what this is or how to do it! i`ve went to a zillion websites and i don`t understand any of it!

1. the atomic mass of Mo is 95.94. calculate the a)mass is grams of one Mo atom. b)number of atoms in one fram of Mo.

2.Determine the mass of 2.00x10^15 Ag atoms.

3.239 g of C5H10O5 would be how many a)moles of C5H10O5 b)C5H10O5 molecules c)moles of carbon d)hydrogen atoms e)protons

2006-10-18 16:25:11 · 3 answers · asked by spoiledCHiC. 1 in Chemistry

Biology question

2006-10-18 16:22:11 · 4 answers · asked by esvskater87 1 in Biology

an object is at rest on a frictionless incline supported by a string parell to the incline. What is the magnitude of the tension in that string in terms of mass of the object and the incline angle theta. What forces would be found on the mass. I know that there are no numbers. Problem is supposed to make you think

No numbers

2006-10-18 16:21:16 · 2 answers · asked by Anonymous in Physics

I need help answering this question...science is not really my thing...even basic science. "suppose you want a precise measure of rainfall, in your area, so you set a rain gauge outside. After it rains, you measure the level of water in the gauge and record the results. you then empty the gauge and wait for the next rain. There are at least tow possible sources of experimental error with this procedure. One will lead to a measurement that is too high and the other will lead to one that is too low. What are these sources of error?

TEN PIONTS TO THE FIRST HELPFUL ANSWER!!!!!!!!!!!!!!

2006-10-18 16:19:27 · 9 answers · asked by nootherlikeme 3 in Weather

A person holds an egg in his hand. If he raised his arm to be 6ft from the ground and dropped the egg, how long would it take the egg to reach the ground??

2006-10-18 16:16:41 · 2 answers · asked by mathteacher 1 in Mathematics

A) CuI2 dissolves in NH3.
B) AgBr dissolves in NaCN.
C) HgCl2 dissolves in KCl.
D) AgCl dissolves in NaCl.

2006-10-18 16:15:17 · 1 answers · asked by Erin C 1 in Chemistry

2006-10-18 16:14:48 · 9 answers · asked by Ryan Z 1 in Mathematics

How many bonds does each have:
carbon?
hydrogen?
oxygen?
nitrogen?
phosphorus?
sulfur?

2006-10-18 16:12:09 · 6 answers · asked by Anonymous in Chemistry

If you are a science student you may know that!
just analyse chromosomal basis of inheritance! you may get answer to my question!

2006-10-18 16:11:47 · 5 answers · asked by Trish 1 in Biology

It's nearly a law that most big men faint or complain about getting blood more than old grandmothers do. Is there some relation that big body mass or dense muscles effect how patients perceive shots? I personally get very lightheaded and dizzy when getting blood. Not because I'm scared or anxious, I'm almost certain it's a natural effect due to something I can't explain.

2006-10-18 16:11:21 · 8 answers · asked by Anonymous in Medicine

We all know that the universe is expanding into nothing- What is nothing?

2006-10-18 16:05:42 · 25 answers · asked by Anonymous in Astronomy & Space

2006-10-18 16:05:13 · 23 answers · asked by poopassboob 2 in Other - Science

A) NaOH
B) HNO3
C) NH3

I think its A because NaOH is a stong base?

2006-10-18 16:03:26 · 3 answers · asked by Erin C 1 in Chemistry

Could you help me answer the following questions?
1) If a cell that is about to divide has 22 chromosomes, how many chromatids does it have? How many centromeres does it have?

2)Are homologous chromosomes normally found in gametes? Why/why not?

2006-10-18 16:02:34 · 2 answers · asked by =] 2 in Biology

no

2006-10-18 16:02:16 · 1 answers · asked by CookFrNW 3 in Earth Sciences & Geology

2006-10-18 16:02:00 · 4 answers · asked by Somebody 2 in Mathematics

diagramB is a glass jar with a rubber sheet tightly fixed to the bottom opening of the glass jar. it also has a tube fixed into the cork at the top opening of the glass jar. it has two balloons fixed to the tube. the tube and the balloons are acting as the lungs while the rubber sheet is acting as the diapragm.

2006-10-18 16:01:35 · 1 answers · asked by 3littlepigs 1 in Other - Science

I'm doing math homework with my child, and I don't remember how to do this. I need to be reminded of the simple steps to find how many of each item at different prices were sold in order to reach the given amount of money. HELP!

2006-10-18 16:01:16 · 7 answers · asked by maytee h 1 in Mathematics

v_y = v_y_0 + a*t

y= y_0 + v_y_0 * t +1/2*a*t^2

v_y^2 = v_y_0^2 + 2*a*(y-y_0)

I know that v_y_0 = 0 and y_0 = 0 (a ball is rolling off a ramp and I need to figure out the final velocity in the y direction) I know the values of y, a (9.8), and time. Each equation I use, however, produces different results. What am I doing wrong here?

2006-10-18 15:57:18 · 3 answers · asked by bep 2 in Physics

Four strong men kidnap a man. They tie him up tightly and lock all the doors. One of the men says "We will each make 2 statements. If you can tell us which of us lies and which of us tell the truth, we will release you. #1 said: 3 people are lying, & 1 tells the truth. #2 said: #1 is a liar & #3 tells the truth. #3said: #2 tells the truth & #1 tells lies. #4 said: #1 tells the truth & #3 liesl Who lies and who tells the truth?

2006-10-18 15:56:25 · 3 answers · asked by Rich G 1 in Mathematics

The half life of 52 Mn is 5.6 days.
25
How many half lives are past after 50.4 days?
How much of a 100g sample would be left after that time?

2006-10-18 15:54:16 · 9 answers · asked by xxgodsgift2youxx 1 in Physics

a swimmer is capable of swimming 0.45m/s in still water.
(a) if she aims her body directly across a 75 m wide river whose current is 0.40m/s, how far down stream will she land? (from a point opposite her starting point).
(b) how far will it take her to reach the other side?

2006-10-18 15:54:11 · 2 answers · asked by 3ajeeba_q8 2 in Physics

2006-10-18 15:53:52 · 4 answers · asked by proud2beme4shittz 1 in Biology

i have a biology test tomorrow

2006-10-18 15:51:23 · 4 answers · asked by proud2beme4shittz 1 in Biology

and what could it increase the amount of oxygen in water and how can we reduce it?

2006-10-18 15:49:27 · 2 answers · asked by plz help me 1 in Biology

From what I understand, this speciality pumpkin, or it could be a winter squash, is in the 15 pound range. It has been requested by one of our customers and we have never heard of it or seen it before. I have checked in the 2006 seed catalog for both Rupp and Harris and had no luck. Anyone know where we may be able to fine this seed for next years pumpkin season?

2006-10-18 15:46:42 · 1 answers · asked by Blonde 1 in Botany