Science & Mathematics - 30 January 2007

Doing Fractions in school,Please help!!

2007-01-30 15:19:17 · 13 answers · asked by Anonymous in Mathematics

2007-01-30 15:17:50 · 3 answers · asked by Anonymous in Mathematics

This is a crossword puzzle about Seaweeds. Has 8 letters. The 2nd letter is maybe a "u".

2007-01-30 15:17:14 · 1 answers · asked by Anonymous in Botany

-3x + 4y = 11

2007-01-30 15:17:08 · 5 answers · asked by Hollywood 2 in Mathematics

today i had to send my kids to school and it was only 8 F outside with wind gust of 33 mph making it hard to catch your breath and the wind chill was -11 F. the news says it will only get worse because a huge cold snap is coming in. when is it too cold to send these young children to school...... i know that i myself do not feel comfortable going out in this myself and i am 30 and big enough to withstand the weather longer.

what temperature F is considered tooooooo cold? sorry my key froze.

2007-01-30 15:15:46 · 17 answers · asked by painfully yours 3 in Weather

2007-01-30 15:15:34 · 20 answers · asked by Jerry 6 in Other - Science

At an intense emotional moment, like sorrow, sadness, or immense joy, why do we cry?
What is the scientific expalnation behind this, and please don't make it too complicated for me to understand. Thanks.

2007-01-30 15:14:05 · 5 answers · asked by Nicole 4 in Biology

Lets say the temperature is 55 F on monday and tuesday but on monday the humidity is 80 and on tuesday the humidity is 30 which day will form the most condensation?

2007-01-30 15:13:39 · 3 answers · asked by Anonymous in Weather

I want to be a cardilogist or a pediatrician.At which age I will finish my studies????

2007-01-30 15:13:02 · 10 answers · asked by The Apostle 2 in Medicine

You're d1=7.09 m from one wall of a house. You want to toss a ball to your friend who is d3= 7.09 m from the opposite wall. The house is d2=7.09 m wide and has a height of h1=3.12 m. The throw and catch each occur h2= 1.02 m above ground. What minimum speed will allow the ball to clear the roof?

WHAT DO I DO? i'm looost

2007-01-30 15:12:08 · 2 answers · asked by theleprechaunsarecoming 1 in Physics

2007-01-30 15:11:22 · 4 answers · asked by Anonymous in Mathematics

I am trying to learn how to do algebra but I am totally lost. My professor really tried to help me but I just couldnt pick up on the way that he was teaching me. Do you know of any easy ways or shortcuts to remember that would help me really learn algebra and keep it in my head?

2007-01-30 15:11:19 · 6 answers · asked by misskashmere 2 in Mathematics

2007-01-30 15:10:06 · 2 answers · asked by Anonymous in Mathematics

it also has to show how to build it if possible. i need it for a science project.

2007-01-30 15:09:54 · 1 answers · asked by curious 1 in Biology

2007-01-30 15:08:45 · 3 answers · asked by little.clown 2 in Chemistry

Na2O, BaO, CO2, N2O5, P4O10, SO3.
Please, Im lost!

2007-01-30 15:07:48 · 1 answers · asked by Me 3 in Chemistry

Or someone know a research about the pattern...

2007-01-30 15:07:43 · 4 answers · asked by killercuy 2 in Zoology

Given the following data:


2O3 → 3O2 DH = −427 kJ


O2 → 2O DH = +495 kJ


NO + O3 → NO2 + O2 DH = −199 kJ


Calculate DH for the reaction


NO + O → NO2

I know that I have to manipulate the equation but I am getting some off answers. Can anyone point me in the right direction?

Someone answered me saying that Oxygen is not a monotomic element and yes i know that -- thats why the reaction is + it requires work. I need more direction than that.

2007-01-30 15:07:10 · 1 answers · asked by Shannon M 1 in Chemistry

is there evidence of a genetic predisposition to a belief in god?
i was brought up in a church going family but i am (to be honest) contemptuous of pushy believers. the entire god arguement never "clicked" with me. is faith or skeptisism hardwired?
please don't say repent or die. this is a serios question.
if you believe or disbelive explain why and don't be rude please

2007-01-30 15:07:01 · 11 answers · asked by rick m 6 in Other - Science

what do you believe about ufos?

2007-01-30 15:06:58 · 21 answers · asked by wayne s 1 in Astronomy & Space

I know I learned this at some point...
I only have one for each, one of those fill-in chart type things.

2007-01-30 15:06:05 · 3 answers · asked by Anonymous in Chemistry

2007-01-30 15:05:19 · 13 answers · asked by person 2 in Mathematics

Im competely lost!! HELP! ME UNDERSTAND!

Ocatane, C8H18 is a desirable component of gasoline. Octane burns cleanly and prevent engine knocking in automobiles. The thermochemical equation showing the combustions of octane is shown below.
C8H18(L)+25/2 O2(g)--> 8CO2(g)+ 9H2O(g)
then is says: triangle thing H = -5472kJ

1. What is the heat reaction for the combustion of octane in Kcal/mol ? (4.184 J= 1cal)

2.Before octane combusts, what type of energy is present in the system?

3. After octane combusts, what type of energy is present in the system?

Im so lost! Any info on this prob would be wonderful!!!!

2007-01-30 15:05:09 · 3 answers · asked by Tracey Lee ♥ 2 in Chemistry

The largest island in Oceania is Australia. What is the smallest island in Oceania?

2007-01-30 15:04:56 · 3 answers · asked by aunty_sar 1 in Geography

I can find the forecast for my zip, but I can't find the precipitation level for the day. Help!

2007-01-30 15:04:37 · 36 answers · asked by Anonymous in Weather

log16 4

i know the answer is 1/2 but how do you get it?

and

log2 1/32

know the answer is -5 but how do you get it?

2007-01-30 15:03:57 · 7 answers · asked by Zac 2 in Mathematics

Im Stumped with this problem:

Calculate the standard enthalpy change in kJ for the production of 14.6 g of Fe(s) from a reaction where the reactants and products are:

reactants: Fe2O3 (s) CO (g)

products: Fe(s) CO2 (g)

2007-01-30 15:03:11 · 4 answers · asked by Jessica R 1 in Chemistry

I have recently just done a experiment that has to do with mass, capacity, weight and volume. I filled the beaker with 100ml of water. It turned out to be 90.4 grams after I subtrated the weight of the beaker. Then I tried doing it with 200ml of water. I got 197gram after I subtracted the weight of the beaker. Shoudn't it be 180grams instead of 197 cause it's doubled? I made sure I used the triple beam balance correctly and I used the same beaker. Basically what im wondering is, does it have to do with the particle theory? like what happened to the particles?

2007-01-30 15:02:48 · 5 answers · asked by Matt 2 in Chemistry

is there evidence of a genetic predisposition to a belief in god?
i was brought up in a church going family but i am (to be honest) contemptuous of pushy believers. the entire god arguement never "clicked" with me. i
s faith or skeptisism hardwired?
please don't say repent or die. this is a serios question.
if you believe or disbelive explain why and don't be rude please

2007-01-30 15:01:56 · 7 answers · asked by rick m 6 in Other - Science

A boat moves through the water with two forces acting on it. One is a 2.62x10³ Newtons (N) forward push by the motor, and the other is a 1.70 x 10³ N resistive force due to the water.

a) What is the acceleration of the1349.4 kg boat? Answer in units of m/s²

b) If it starts from rest, how far will it move in 13.5 s? Answer in units of m.

c) What will its speed be at the end of this time interval? Answer in units of m/s.


My teacher is not very understanding. I have been absent for a week for a family funeral and I really do not understand what has been going on in physics class. Please help me solve any of these or all of them and show how you got the answer. ANYTHING helps. Thank you so much!

2007-01-30 14:59:27 · 2 answers · asked by susie q 2 in Physics