Science & Mathematics - 10 December 2006

The Volume,V of a mass of gas varies directly as the temperature, T and inversly as the pressure, P.If V=12 T=42 P=20, what is the volume when T=30 and P=15?

2006-12-10 09:25:23 · 1 answers · asked by robby_miami05 1 in Mathematics

2006-12-10 09:23:32 · 14 answers · asked by luna y 1 in Biology

Describe how the graph of f(x)=54(x-5/3)^3-16 is related to the graph of y=x^3 by specifying the various horizontal and vertical movements and expansions or contractions which are produced by the numbers 54, -5/3 and -16 in the expression f(x)=54(x-5/3)^3-16.

Can somebody help explain what this means and the ans pls?

2006-12-10 09:23:31 · 2 answers · asked by SHIBZ 2 in Mathematics

Phosgene was used as a poisonous gas in World War I. At high temperatures it decomposes as follows:


COCl2(g) ↔ CO(g) + Cl2(g)


with Kc = 4.6×10-3 at 800 K. A sample of 6.76 g of COCl2 is placed in a 1.00-L reaction vessel and heated to 800 K. What are the equilibrium concentrations of all of the species? Enter concentration for COCl2 first, then for CO and then for Cl2.

also what fraction of COCl2 has decomposed?

2006-12-10 09:20:24 · 1 answers · asked by Anonymous in Chemistry

A farmer has two pieces of land. 20% of the first plot is planted with cotton and 40% of the second plot is planted with cotton. Can we calculate the percentage of the farmer's total land that is planted with cotton by adding 20% + 40%? Please explain your answer.

I am giving my students a test, and I was wondering on a scale of 1-10 how easy this problem was. 1 being easy, 10 being hard. Thank you! Also, I would like to see how different people go about answering this question! Thank you so much!

2006-12-10 09:19:45 · 12 answers · asked by Courtney Jane 1 in Mathematics

1)
ln x + ln (x-5) = ln 4x

x=??

2)

2^2x+4=3^x-34



please show work

2006-12-10 09:19:06 · 2 answers · asked by j.ollyroger 1 in Mathematics

2006-12-10 09:18:40 · 3 answers · asked by snakexxx25 1 in Engineering

2006-12-10 09:17:25 · 6 answers · asked by Cool Ramlows 1 in Physics

2006-12-10 09:17:00 · 2 answers · asked by oscar d 1 in Geography

I need to prove that:

[X_n - E(X_n)]/[var(X_n)

tends in distribution to a standard normal distribution, where

X_n~Bin(n,p)

I know that E(X_n) = np, var(X_n) = np(1-p), and letting Y_n equal what i need to show, and finding the mgf of Y_n, i get

[p(exp{t/sqrt(np(1-p))) + (1-p)]^n times exp{-npt/sqrt(np(1-p))}

Where sqrt is the square root. I have taken logs of both sides, to get

[-n^2pt/sqrt(np(1-p))] log [p(exp{t/sqrt(np(1-p))) + (1-p)]

Now i think i need to use the taylor expansions for exp(x) then for log(1+x), but this doesn't simplify to exp(t^2/2) which is what i need to show this expression does simplify to. Am i on the right tracks, or am i totally wrong? If i'm wrong, could you point me in the right direction, step by step please? Thanks

2006-12-10 09:15:12 · 2 answers · asked by drummanmatthew 2 in Mathematics

what is the best telescope I can get with $200 or $300? what will I be able to see with it?

2006-12-10 09:14:40 · 8 answers · asked by wormhole 2 in Astronomy & Space

2006-12-10 09:14:31 · 9 answers · asked by Anonymous in Geography

A box weighing 70N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Determine the force that the table exerts on the box if the weight hanging on the other side of the oulley weighs (a) 30N (b) 60N and (c) 90N.

2006-12-10 09:14:12 · 2 answers · asked by Anonymous in Physics

2006-12-10 09:12:29 · 12 answers · asked by Anonymous in Geography

2006-12-10 09:11:08 · 4 answers · asked by Anonymous in Geography

You remember E=mc2.But he said mass increased with velocity.
That is not correct - the potential energy increases, The energy, not the mass, the mass will always be the same but weigh differently according to the ambient gravity.

2006-12-10 09:10:57 · 14 answers · asked by Anonymous in Physics

wat is the formula for argon gas?

2006-12-10 09:10:31 · 2 answers · asked by Rachel 2 in Chemistry

2006-12-10 09:10:20 · 4 answers · asked by peace 1 in Engineering

2006-12-10 09:09:25 · 16 answers · asked by sarah k 2 in Chemistry

Likw OH, CO2, H2O, and what is the name for thoose long eguations, like O2H+CO2+ w/e...and if i wanted to find what elements in cooking oil what can i do???

2006-12-10 09:09:02 · 3 answers · asked by Fritz J 3 in Chemistry

Dry hot boxes like Phoenix or Las Vegas? Or maybe the hot humid swampy cities like Houston or New Orleans?

2006-12-10 09:08:58 · 8 answers · asked by Jumpin' Jack Flash 1 in Weather

2006-12-10 09:08:42 · 5 answers · asked by Gabriella 2 in Zoology

Are the two synonymous or same genus or biological family? What is their biological family? I tried looking for it on various sites and found confusing answers.

ps: Please do not answer this question casually

2006-12-10 09:08:07 · 11 answers · asked by rhij 1 in Botany

please can you give me five facts about antibiotics if they were short and in bullet points that would really help thanks :D

2006-12-10 09:07:45 · 8 answers · asked by louise 2 in Medicine

2006-12-10 09:07:41 · 2 answers · asked by toomanyqs 1 in Earth Sciences & Geology

Where do you find sand ex. beahes, deserts, etc.
3 possible ways on how sand is made. :-)

2006-12-10 09:06:54 · 7 answers · asked by Arvind 2 in Earth Sciences & Geology

Please help me with this problem.
It seems so easy.
But I'm having trouble setting it up.

2006-12-10 09:05:05 · 3 answers · asked by vicky p 1 in Physics

Why is the sum of the forces on colliding objects zero? (momentum is conserved)

2006-12-10 09:04:00 · 2 answers · asked by coolguy0603 1 in Physics

2006-12-10 09:03:04 · 9 answers · asked by wrighty_222 1 in Astronomy & Space

2006-12-10 08:59:58 · 5 answers · asked by j train 2 in Chemistry