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Science & Mathematics - 8 January 2007

[Selected]: All categories Science & Mathematics

Agriculture · Alternative · Astronomy & Space · Biology · Botany · Chemistry · Earth Sciences & Geology · Engineering · Geography · Mathematics · Medicine · Other - Science · Physics · Weather · Zoology

i am stuck on a problem all i need is to know how to plug in sec^2 into the calculator. Or what is the derivative of tangent

2007-01-08 13:25:29 · 6 answers · asked by Anonymous in Mathematics

I have recently belived it is possible to go forward,and I know the explination but i dont think it could ever be possible to go back.

2007-01-08 13:24:46 · 16 answers · asked by Anonymous in Astronomy & Space

TO ME. MY HANDS WERENT WET AND I WASNT TOUCHING NO METAL. WHAT DO YOU THINK CAUSED IT TO SHOCKME? AND WHAT HAPPENS TO YOUR BODY WHEN YOU GE T SHCOKED ?COULD I HAVE DIED. THERE WAS NO METAL OR WATER NEAR ME, WHY DID THAT HAPPEN? WHY DOES ELECITY DO THAT AND HOW CAN I PREVENT FROM HAPPENING AGAIN?

2007-01-08 13:24:30 · 5 answers · asked by jennifer 1 in Zoology

1.78 grams of an unknown solute is dissolved in 22.43 grams of a solvent having a K(sub f) of 7.11 C/m. The normal freezing point of the solvent is 48.91 C. The solution freezes at 46.38 C. Find the molecular mass of the unknown.

All I need is an equation to solve for this problem, thanks!

2007-01-08 13:24:15 · 1 answers · asked by shanerox2005 1 in Chemistry

Here is the problem
Calculate delta E (change in internal energy) and determine whether the process is endothermic or exothermic for the following cases:
a a system absorbs 85 kj of heat from it's surroundings while doing 29 kj of work on the surroundings.
B. Q equals 1.50 kj and w equals -.657kj
c the system releases 57.5 kj of heat while doing 13.5 kj of work on the surroundings.
answers.
a 56kj endothermic
b. .84kj endo
c. -71 exothermic

What I don't understand is why the formula changes. I thought it is always supposed to be change in E = q + w but for a it is q-w, b it is q+w, and c it is -(q+w). Could someone please explain? It's probably something simple I just am missing. Thanks a lot.

2007-01-08 13:23:59 · 2 answers · asked by Sam 3 in Chemistry

what type of electrical cell is in a common battery?
a.) piezoelectric
b.) electrochemical
c.) thermoelectric
d.) photoelectric

2007-01-08 13:23:05 · 6 answers · asked by Anonymous in Engineering

Here are the only 2 questions I cant answer:

1. -x/3 - 12 = x

2. x/4 - 9 = -(x - 3)/ 2

For question #2: the whole thing in parenthasis is being divided by 2.

plz tell me the answer plus the work so that i understand. thanks!

2007-01-08 13:22:35 · 4 answers · asked by funkypolak17 3 in Mathematics

x + y - z = -1
x + y + z = 3
3x - 2y - z = -4

...these are the equations, first i tried the 1st and 2nd and i ended up canceling everything out and then i just tried the 3rd one and i put everything equal to Z and then i input it back into the 1st and 2nd equation and then i just ended up canceling everything out again..can someone please show me how to get an answer because i am so connnnfused

2007-01-08 13:22:13 · 4 answers · asked by Lily 2 in Mathematics

I know these are simple problems but i can't seem to get them right:

find the distance between the pts. (-1, 4) and (3,1)

use the function f(x)= x and g(x)= 2x-4 to find f(x) * g(x)

thanks for the help for those who helped me!!!

2007-01-08 13:21:43 · 2 answers · asked by Mia16 3 in Mathematics

A variation of a triathlon competition has a contestant swimming from a point, A, on one shore of a lake, to a point C on the opposite parallel shore, then running to the finish, B, further along the lakeshore. The lake is 4km wide and the finish line is 10km down the lake. If a contestant can swim at 2km/h and run at 10km/h, determine the point C that will minimize the total time for the race.

Thank you =D

2007-01-08 13:18:17 · 2 answers · asked by Mickey mouse 1 in Mathematics

2007-01-08 13:16:44 · 14 answers · asked by Gabriel D 1 in Mathematics

The Supplements of Angle Proof (no picture given)

***NOTE: < is used for the angle symbol (I dont have a way to make an angle symbol)

Given: < 1 is a supplement of < 2
< 3 is a supplement of < 4
m < 2 = m < 4

Prove: m<1=m<3

Statements and Reasons

2007-01-08 13:15:15 · 1 answers · asked by hoopmaster1 1 in Mathematics

I hope not.

2007-01-08 13:14:43 · 5 answers · asked by Anonymous in Weather

ok............check out these questions ya'll:

1. Before the seventeenth century, what ideas did people have concerning motion, velocity, and acceleration?

2. How did philosophers in ancient times explain motion in the solar system?

2007-01-08 13:14:20 · 2 answers · asked by Yisi 3 in Mathematics

I was in class today and we were talking about the moon and somebody brought up the dark side of the moon. I was really curious to know the answer. Also, wouldn't be cool if they made a scary movie about it?

2007-01-08 13:14:07 · 5 answers · asked by Anonymous in Astronomy & Space

I need Information of engineering simulation,its application in future and present,and different tools used forfor engineering simulation?I wud gratefully feel happy to Answers.
thank you

2007-01-08 13:13:40 · 2 answers · asked by Vamsi V 1 in Engineering

Given:
1
11
21
12 11
11 12 21



What are the next two rows?

2007-01-08 13:13:36 · 8 answers · asked by Sean D 2 in Mathematics

what is the solubility of :
suger
napthalene
sulfer
salt
and PDB (para-diclorabenzyne)

any of the answears would be great

2007-01-08 13:13:14 · 4 answers · asked by Anonymous in Chemistry

a. CsF
b. CsCl
c. NaCl
d. NaF
e. LiF

2007-01-08 13:12:47 · 3 answers · asked by Stephanie 2 in Chemistry

i need it fast!! please!!

2007-01-08 13:10:29 · 9 answers · asked by Anonymous in Geography

ok. for my parents valentines day gift I need 675$ ( not including tax) by february 10/12 (because i still need time to wrap it.)
How much money do I need to earn a day in order to have 675$+extra for tax by february 10th or 12th?

2007-01-08 13:09:55 · 5 answers · asked by adancez 1 in Mathematics

2007-01-08 13:08:51 · 2 answers · asked by LaLaLoo 1 in Engineering

if it takes an employee 1 hour to uncrate and stack 160 boxes, at a rate of 8 bucks per hour, much does it cost to uncrate a box?
is it 160/8 or 8/160.
I know it's easy, but my brain isn't working, im getting really confused.

2007-01-08 13:07:33 · 5 answers · asked by Mikail 2 in Mathematics

The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/gK and 2.3 J/gK, respectively. How much heat is required to convert 62.0 g of ethanol at -135°C to the vapor phase at 78°C? Please, if anyone can figure this out, thank you so very much.

2007-01-08 13:07:28 · 3 answers · asked by magicalplaygirl 1 in Chemistry

The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. The specific heats of solid and liquid ethanol are 0.97 J/gK and 2.3 J/gK, respectively. How much heat is required to convert 62.0 g of ethanol at -135°C to the vapor phase at 78°C? Please, if anyone can figure this out, thank you so very much.

2007-01-08 13:06:03 · 3 answers · asked by magicalplaygirl 1 in Engineering

2007-01-08 13:05:58 · 2 answers · asked by Skittles 2 in Physics

2007-01-08 13:04:28 · 5 answers · asked by nagant39@sbcglobal.net 2 in Biology

Ok so I don't understand how to do these...I can do regular factors like x2+31x+30 but I need help with the following::
6x2+23x+6 10x2+23x+6 16x2-56x+49

2007-01-08 13:02:48 · 7 answers · asked by rach 1 in Mathematics

well im only a sophomore in highschool, but the pharmacy career has interested me. My parents have told me about it, and want me to pursue it. I have a couple questions though, what EXACTLY do they do? i mean i searched and found replies that you need to know math and physics. whats that have to do with medicine? im not the GREATEST math wiz or physics person so thats why i ask. I like general chemistry and sciences though.

2007-01-08 13:02:30 · 5 answers · asked by markp9114 2 in Medicine

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