Science & Mathematics - 25 October 2007

If you are told the purity of compund Z is 85% and the reported value for its molar extinction coefficient is 19,200 M-1cm-1 at 605 nm. What should the molar extinction coefficient of this impure compound Z measure as? Can someone show me how this is done?

2007-10-25 05:48:13 · 1 answers · asked by raleighzia 1 in Chemistry

How can this be done???
-8 = w
4

2007-10-25 05:47:27 · 4 answers · asked by Anonymous in Mathematics

There are two fields- magnetic and electric which are parallel to each other. If a particle is placed on the magnetc field, what would be the direction of this particle.(how would it move)

2007-10-25 05:43:40 · 1 answers · asked by meeta1704 2 in Physics

I thought it was purple but i am having seconds thoughts.

2007-10-25 05:35:21 · 11 answers · asked by allstarcatcher75 2 in Other - Science

Well, had a debate about gravity, and was wondering, does gravity pull down, or does it pull in, towards the Earth's core? Are down and in the same thing, or are they differant? If they are differant, how so? Please provide any examples and referances for this question.

2007-10-25 05:30:19 · 5 answers · asked by Obsidian 2 in Physics

if leaves lose water through their stomata, would you expect to find more or fewer stomata on large leaves? what other advantges are ther for a leaf to have a large surface area?

2007-10-25 05:29:20 · 3 answers · asked by schloe7 2 in Botany

it should be cool looking.
cab be of any topic but should be impressive.
u can also give me topic on probablity or circles

2007-10-25 05:28:03 · 1 answers · asked by parth k 2 in Mathematics

Also, what experiments could i use to test cloud formation

2007-10-25 05:27:12 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Can,t find any info on these plants..Anyone know?? thanks
http://i221.photobucket.com/albums/dd26/pixsur/fall023.jpg
http://i221.photobucket.com/albums/dd26/pixsur/fall021.jpg
http://i221.photobucket.com/albums/dd26/pixsur/fall025.jpg

2007-10-25 05:27:10 · 4 answers · asked by billybob 2 in Botany

What is the largest mining company of Malachite?
Sources welcome!
thanks in advance!

2007-10-25 05:23:25 · 1 answers · asked by F-Baby! 5 in Earth Sciences & Geology

2007-10-25 05:19:56 · 6 answers · asked by bluenose159 1 in Chemistry

X^2 must be added nd subtracted to factor the problem

2007-10-25 05:19:47 · 4 answers · asked by Anonymous in Mathematics

Who would win?

2007-10-25 05:16:15 · 16 answers · asked by Anonymous in Zoology

I solved this problem by hand and by calculator(pretty print is on so i know i typed it in correctly)

but i got a different answer doing it both ways

the problem is
triple integrate (y dz dy dx) where:
0 <= z <= 2-2x-y
0 <= y <= 2-2x
0 <= x <= 1

i got 4.4222
and the calculator got .3333

can someone tell me the right answer?

*maybe show some work if possible*

2007-10-25 05:15:17 · 1 answers · asked by Anonymous in Mathematics

This was classified as a hurricane, and hurricanes are given names. What was the name of the hurricane the press call "The Great Storm" which battered England 20 years ago?

2007-10-25 05:14:45 · 8 answers · asked by Phil McCracken 5 in Weather

2007-10-25 05:13:47 · 2 answers · asked by arnisboy93 1 in Botany

2007-10-25 05:05:40 · 3 answers · asked by gkay84 1 in Earth Sciences & Geology

A 34.0 kg seal at an amusement park slides down a ramp into the pool below. The top of the ramp is 1.55 m higher than the surface of the water and the ramp is inclined at an angle of 30.0° above the horizontal. The seal reaches the water with a speed of 4.90 m/s.
(a) What is the work is done by kinetic friction?
(b) What is the coefficient of kinetic friction between the seal and the ramp?

I am having some trouble with this one. Any help would be much appreciated. Thanks!

2007-10-25 05:04:48 · 4 answers · asked by Tana 1 in Physics

2007-10-25 05:04:25 · 14 answers · asked by clappinhands 1 in Mathematics

A 2.8 kg block slides with a speed of 1.1 m/s on a frictionless, horizontal surface until it encounters a spring.

(A) If the block compresses the spring 5.7 cm before coming to rest, what is the force constant of the spring?

(B) Find the greatest height of the rock as measured from the base of the cliff.

Ok, I feel rather dumb for not being able to get this, but I get the wrong answer every time. Help please!

2007-10-25 05:02:39 · 2 answers · asked by Anonymous in Physics

2007-10-25 05:01:06 · 12 answers · asked by MARTIN 2 in Mathematics

2007-10-25 04:56:24 · 10 answers · asked by Anonymous in Mathematics

A carnival game requires you to knock over a wood post by throwing a
ball at it. You're offered a very bouncy rubber ball and a very sticky
clay ball of equal mass. Assume that you can throw them with equal
speed
and equal accuracy. You only get one throw.

Which ball will you choose? Why?

2007-10-25 04:54:26 · 2 answers · asked by You Know Who 2 in Physics

In other words, do particular birds typically play certain roles based on characteristic preferences or "personalities"? (e.g., are some birds just "natural leaders"/"followers", etc?) Or instead is it the case that, at any given time, the flight position of any particular bird is just a random thing?

2007-10-25 04:52:43 · 4 answers · asked by eroticohio 5 in Zoology

Have you ever seen this?

2007-10-25 04:52:30 · 8 answers · asked by Anonymous in Astronomy & Space

some one asked me to find out the n th term of the following number sequence

1 2 4 8 16 32 64 128 512 1024 2048....

2007-10-25 04:51:33 · 10 answers · asked by Johny E 1 in Mathematics

I was always told that microwaves work better to heat food with a higher moister content (Water). But recently I heard it is food with a high fat content that makes it heat the food better. The more fatty the food the better it heats. The latter makes no sense to me because you would not be able to heat a cup of water then. Anyone know the real answer?

2007-10-25 04:50:18 · 2 answers · asked by jennifer P 1 in Engineering

To determine the NortonEquivalent circuit for a circuit containing a voltge dependent current source, you can use which of the following techniques(maybe more then 1 ans)
A Find the TheveninEquivalent circuit and then use source transformation
B The Norton current is equal to the current through the load resistance connected between the terminals of interest, and the Norton equivalent resistance is equal to the load resistance
C The Norton current is equal to the dependent current source value, and the NortonEquivalent resistance can be found by zeroing all sources(independent and dependent) and using resistor combinations(series and parallel) to reduce the circuit to one equivalent resistance
D Place a short circuit between the terminals of interest and find the short circuit current, then zero all independent sources and determine the equivalent resistance of the circuit by applying a test voltage at the terminals of interest and solving for the current out of the test voltage source

2007-10-25 04:48:52 · 2 answers · asked by humphrad 1 in Engineering

1) Calculate the frequency associated with light of wavelength 740 nm.

2) Microwaves have frequencies in the range 109 to 1012 /s (cycles per second), equivalent to between 1 gigahertz and 1 terahertz. What is the wavelength (in meters) of microwave radiation whose frequency is 2.157 x 1010 /s ?

2007-10-25 04:48:17 · 2 answers · asked by keya_na 2 in Chemistry

2007-10-25 04:46:56 · 2 answers · asked by Anonymous in Mathematics