Science & Mathematics - 4 November 2007

I think this answer is wrong 13 is not the solution.
Can someone tell me if I am right

2007-11-04 14:26:19 · 47 answers · asked by m&m 1 in Mathematics

hey there! :)
i've developed a new tree structure for organizing semantics.
can anyone give me some pointers on how to prove a tree.
is it good to prove it by analyzing the way the tree is being used to solve a particular problem, say text segmentation?
how should I write a paper on it? like, what are the angle i should focus on and etc.

thanx!

2007-11-04 14:26:17 · 1 answers · asked by thinker 1 in Mathematics

Consider the dissolution of CaCl2:

CaCl2 -> Ca+2 + 2Cl- Delta H= -81.5 kj

An 11.0 g sample of CaCl2 is dissolved in 125g of water, with both substances at 25.0 degress celcius. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat of 4.18 J/g * C.

2007-11-04 14:26:16 · 1 answers · asked by jotham4200 1 in Chemistry

And if we are looking and seeing it head-on is it coming towards the Earth? The Mayan Calendar ends in 2012.
Someone here on Yahoo put it down as 12/12/2012. I read that Comet 17P/Holmes is in the Northern Skies and looks pretty fuzzy right now. All that dust reflecting light, a comet with no tail.

2007-11-04 14:24:46 · 10 answers · asked by blueridgemotors 6 in Astronomy & Space

2007-11-04 14:22:06 · 6 answers · asked by Anonymous in Chemistry

2007-11-04 14:17:40 · 5 answers · asked by chaniquana 1 in Chemistry

2007-11-04 14:15:09 · 2 answers · asked by lovelylittlelady 3 in Mathematics

Find a positive number such that the sum of the number and its reciprocal is as small as possible.

2007-11-04 14:14:09 · 3 answers · asked by Britt R 1 in Mathematics

and how do you balance this one?

Sn + KOH ----> K(2)SnO(2) + H(2)

This (2) means that the two is on the bottom of th element

thanks?!

2007-11-04 14:13:32 · 2 answers · asked by Alessandra 2 in Chemistry

2007-11-04 14:12:56 · 9 answers · asked by mztana820 1 in Mathematics

A grindstone in the shape of a solid disk with diameter 0.52 m and a mass of m=50kg is rotating at omega=820 rev/min. You press an ax against the rim with a normal force of F = 230 N, and the grindstone comes to rest in 7.30 s.
http://session.masteringphysics.com/problemAsset/1040261/1/yf_Figure_10_44.jpg

2007-11-04 14:12:47 · 1 answers · asked by zoro-kun 2 in Physics

explain the difference between WHMIS symbols and safety symbols used on commercial products

2007-11-04 14:08:19 · 1 answers · asked by Anonymous in Biology

like i mean when does the mom stop feeding them and also when do they start flying?

2007-11-04 14:07:37 · 1 answers · asked by jag2618 3 in Zoology

like any other kind of good explosive
thanks :)

2007-11-04 14:07:04 · 2 answers · asked by rightt onn 1 in Chemistry

y= (1+3x) / (5-2x)


How to do it..??

2007-11-04 14:06:55 · 3 answers · asked by alexo 4 in Mathematics

2007-11-04 14:06:37 · 2 answers · asked by Cassandra C 1 in Chemistry

Why is it there can be 100% humidity and won't rain for days? I was watching man vs. wild, and he said humidity is often 100%. So, does it involve pressure to get right until it will rain or what?

2007-11-04 14:05:06 · 2 answers · asked by levi rulZ 2 in Weather

I can't take it any more, at begining I just thougth that was just another controversial profesy from Nostradamus, but now I found that the maya calendar ends 2012, the solsistic solar alingment with the center of the galaxy is at 2012, Nasa predicts exchange of magnetic polarities for the sun and the earth at 2012, The chinese calendar finish its cicle at 2012 begining the year of the dragon, the lost book of nostradamus points the apocalipsis at 2012, the popes profesy will gives its 112 pope by this year, the bible in the book of revelations points the apocalipsis too. Thats it, I can't take it no more I resign my job, start spending 100% time with my love ones and getting in all the debt I can who cares this is going too end anyway, why not to enjoy the last of it? Before answering something stuped do some research about this events and you will see that there is some cientific point and a spiritual too that is too much coinsidence dont you?

2007-11-04 14:02:46 · 12 answers · asked by enproblemado 2 in Astronomy & Space

2007-11-04 14:02:12 · 4 answers · asked by tarheel2381348 1 in Mathematics

In a manufacturing plant involving use of methanol, is it safer to have a full tank or a half/less than half full tank (ie. quantity of methanol is less) of methanol?
Which is more dangerous? the fumes or the burning of methanol?

2007-11-04 14:00:28 · 2 answers · asked by LCM 1 in Engineering

Can anyone help me with these last few problems on a review?Thanks!

1.) find a formula for the general term, an for 1/2, 1/4, 1/8, 1/16, ...

2.) Write down the first five terms of the following recursively defined sequence.
a1 = 2; an+1 = - 2an - 3 (the "n" are subscripsts)
(i got 2, -7, -16, -25, -34 which is wrong)

3.) Scott and Amanda want to purchase a house. If they invest 400 dollars per month into a mutual fund how much will they have for a downpayment after 8 years if the per annum rate of return of the mutual fund is assumed to be 9.5% compounded monthly?

4.) Evaluate
Summation from 1 to infinity of 2/(n(n+2))

5.) If the following series converges, compute its sum. Enter INF if it diverges to infinity, MINF if it diverges to minus infinity, and DIV otherwise.
Summation from 1 to infinity of (e^(-1n)-e^(-1(n+1)))

6.) Evaluate
Summation from 1 to inifinity of (-4^(n-1))/(8^n)
(i got -1/4 which is wrong)

7.) Evaluate
Summation from 1 to inifinity of (4^(n)+6^(n))/(10^n)

2007-11-04 13:56:50 · 2 answers · asked by Anonymous in Mathematics

use complete the square method

2007-11-04 13:56:39 · 3 answers · asked by Jake 1 in Mathematics

2007-11-04 13:56:39 · 3 answers · asked by AnonymousNickname 1 in Astronomy & Space

Like I know someone cloned a sheep but do you think the goverment actualy cloned people?

2007-11-04 13:55:55 · 5 answers · asked by Little Miss Perfect 2 in Biology

not quite sure how to work this, tried graphing it out, and I was able to make some pretty pictures but not sure if that's really how you're supposed to do it. :D

A triangle is defined by the following vertices: (40,85), (15,0), and (-40,35). Is it a right trangle?

2007-11-04 13:55:45 · 4 answers · asked by dustin_r_85 1 in Mathematics

2x+3y=28
4x-5y=-10

2007-11-04 13:53:54 · 3 answers · asked by Jamie M 1 in Mathematics

2007-11-04 13:49:31 · 3 answers · asked by Anonymous in Engineering

What are the mechanics (steps involved) in doing this? My text just provides examples without explaining what is going on, how things are moved, etc. Example:

1.
6x -5y = 9
(1/2)x +2y =6

2.
x-7y = -6
4x-5y = 28

2007-11-04 13:47:22 · 1 answers · asked by dustin_r_85 1 in Mathematics

1. Patient suffers head injury in car accidnt, now has large blind areas in visual field, cannot see "shapes" of objects, etc.

2. Stroke victime diagnosed w/ agnosia (semantic agnosia) ; has to handle objects in order to remember their name.

Select area of brain damaged in each:
occipital lobe
right temporal lobe
Broca's area
limbic system
cerebellum
reticular formation

I know it's probably not the last three, but these are the choices. I'm confused because it seems both could be due to damage in occipital lobe, but can only use each one once. Since language is basically in the left temporal lobe, right temporal lobe didn't seem correct, either. Help!

2007-11-04 13:42:05 · 2 answers · asked by neni 5 in Medicine

2007-11-04 13:39:47 · 4 answers · asked by abraymond5 1 in Mathematics