Science & Mathematics - 19 January 2007

will occur

2007-01-19 13:32:51 · 5 answers · asked by Bill B 1 in Mathematics

2007-01-19 13:32:03 · 6 answers · asked by ANIRUDDHA N 1 in Mathematics

I REALLY need the answer for this because for my test question, there was this question that said,
"Give a convincing arguement that 3 to the power of 0 is 1 using the fact that 3 to the power of 4 is 81, 3 to the power of 3 is 27, 3 to the power of 2 is 9, and 3 to the power of 1 is 3."

2007-01-19 13:30:40 · 14 answers · asked by Spectrum 1 in Mathematics

2007-01-19 13:28:56 · 4 answers · asked by sarcastro1976 5 in Medicine

When I was young, I always lost my calculator, so I was often force to write my math exams without a calculator. Now I can do pretty much anything in my head, that includes multiplying numbers with decimals together. For example: 234.83 X 283.123

2007-01-19 13:28:42 · 6 answers · asked by Anonymous in Mathematics

what is the best way to teach a cat how to fetch, he allready chases little ratly balls u throw for him now how do u get him to bring it back thanks.

2007-01-19 13:28:35 · 2 answers · asked by Anonymous in Botany

I keep hearing the US government is finding tunnels under houses, how many are there ?

2007-01-19 13:28:23 · 4 answers · asked by Pink Freud 1 in Geography

2007-01-19 13:25:37 · 8 answers · asked by Anonymous in Botany

question....please help me

At t=0 the current to a dc electronic motor is reversed resulting in an angular displacement of the motor shaft given by theta(t) = (250 rad/s)t - 20 rad/s^2)t^-(1.50 rad/s^3)t^3.
a.) at what time is the angular velocity of the motor shaft zero? b.) CAlculate the angular acceleration at the instant that the motor shaft has zero angular velocity. c.) How many revolutions does the motor shaft turn trough between the time when the current is reversed and rhe instant when the angular velocity is zero? d.) How fast was the motor shaft rotating at t=0,when the current was reversed?

thanks really for the help.:)

2007-01-19 13:25:35 · 3 answers · asked by ice_cream_chico11 1 in Physics

What is the maximum number possible and the maximum number for a realistic orchard.

2007-01-19 13:24:11 · 5 answers · asked by Leslie W 2 in Botany

Thanks in advance for the help.

2007-01-19 13:21:51 · 3 answers · asked by Random G 3 in Chemistry

2007-01-19 13:20:53 · 4 answers · asked by goring 6 in Astronomy & Space

Miguel has 14 coins in his pocket. He has one more dime than quarters and three more nickels than dimes. How many of each coin does he have?

Okay, I know this is supposed to be a simple problem...I have the answer:

3 quarters
4 dimes
7 nickels

But how do you set it up? help please

2007-01-19 13:20:15 · 12 answers · asked by lety 2 in Mathematics

If the non-intersecting diagonals of adjacent sides of a cube are at a distance 'd' from each other, find the volume of the cube..
I need proper explanation.....

2007-01-19 13:19:36 · 6 answers · asked by Anonymous in Mathematics

2007-01-19 13:17:46 · 10 answers · asked by Hannah D 1 in Physics

ok. joseph is riding in an elevator which is accelerating downward at -20 meters per second squared. by summing the vertical forces, find the magnitude of the force that the cailing is exerting on joseph if he has a mass of 82 kg.

2007-01-19 13:17:23 · 7 answers · asked by judykharrison 1 in Physics

2007-01-19 13:16:36 · 7 answers · asked by ahappy38 1 in Zoology

the grinder was supplied with 22,486.1 watts of power. the grinder's fractional efficiency was .008. find the work done by the machine in 185 seconds.

2007-01-19 13:15:19 · 2 answers · asked by judykharrison 1 in Physics

I am doing a science fair project measuring the tensile strength of steel, copper, and aluminum, but I don't know where i can go to buy each type of wire in the same gauge. Anyone know?

2007-01-19 13:15:02 · 7 answers · asked by kevin s 1 in Engineering

This is from my child's science experiment. The results actually are quit good.

2007-01-19 13:13:40 · 9 answers · asked by lucy 2 in Other - Science

debra pushes the 25 kg box across the floor with a force of 134 newtons. find the magnitude of the acceleration of the box if the coeffiecient of kinetic friction between the box and the floor is .32 .

2007-01-19 13:13:35 · 3 answers · asked by judykharrison 1 in Physics

Ok, so i did out this problem, but in the answer booklet, i have no idea where this number comes from.
So the problem asks:
HF<-->H+ + F-
a. 40 g HF and 2kg water, determine mass of each substance which is needed to make max quantity of .1 molal HF solution.
i figured this out to be 4 g (0.2 mol) HF and 2 kg water.
the next part asks:
Determine the molality of F- ions and the molality of HF molecules in the solution prepared as directed in part a.
what the book does is, it says that the molality of all dissolved particles is equal to the sum of the molalites of H+ ions, F- ions, and HF molecules.
mH+mF+mHF=0.108 <<<---Where does that number come from/?????
it then explains, per kg solvent, let x=mol HF dissociated=mol H+formed=mol F- formed
0.1 - x = mHF
x+x+(0.1-x)=0.108
x=0.008
Now what confuses me is where the 0.108 came from?!?!?!?
it says no where how it comes from or where they got it?
possible explanation please?

2007-01-19 13:12:48 · 2 answers · asked by Anonymous in Chemistry

i know it's increase, but does its volume increase or decrease? and an explanation why please.

what is the minimum number of calories needed to chance 40 grams of water at 100 C to steam at the same temperature and pressure? 1. 43200, 2. 21600, 3l540, 4.40.


A gas sample is at 10 C, if pressure remains constant, the volume will increase when the temperature is changed to. 1. 263 K, 2. 273 K, 3. 283 K, 4.293 K

2007-01-19 13:12:19 · 3 answers · asked by Celia 4 in Chemistry

Thanks!

2007-01-19 13:11:20 · 4 answers · asked by Anonymous in Engineering

I forgot what their name was. Hmm... I know there are real exsisting things, they are in a package, and you put them into water and they grow with food and they look like sting rays...

2007-01-19 13:09:41 · 3 answers · asked by Anonymous in Zoology

i've been learning about them but never get a chance to see a real one.

2007-01-19 13:07:28 · 7 answers · asked by Ha!! 2 in Chemistry

especially head movements, as opposed to slow, deliberate movements?

2007-01-19 13:06:41 · 4 answers · asked by Anonymous in Zoology

I want to do plants flowers to vegetables i just cant figure out how to get it started if there is a website or book on how to do this it would be very helpful. i kinda want to mixed peppers and tomatoes or a common lily with a orange rose. if there is anything please help =(

2007-01-19 13:06:24 · 2 answers · asked by littlehetter 2 in Botany

If the principal quantum number of a shell is equal to 2, what types of orbitals will be present? Is it s and p, or just s? Also, if the principal quantum number of the outermost electron of an atom in the ground state is n=3, what is the total number of occupied principal energy levels contained in the atom? Is it 1, 2, 3, or 4?

2007-01-19 13:05:27 · 2 answers · asked by Anonymous in Physics

find the dp/dt at the boiling point.

2007-01-19 13:00:18 · 1 answers · asked by joy 1 in Physics