Science & Mathematics - 27 November 2006

find the right option
1) highest refraction
2) multiple internal reflections
3) multiple surface reflections
4) hundred percent transmission

2006-11-27 16:02:41 · 6 answers · asked by SUGANTHANA 1 in Physics

3x+2y-z=-11
2x-3y+4z=11
5x+y-2z=-17

2006-11-27 16:00:31 · 2 answers · asked by Anonymous in Mathematics

please explain why.

2006-11-27 16:00:05 · 5 answers · asked by Anonymous in Engineering

Answers:
1) 1/5
2) 2/3
3) 1/3
4) none

2006-11-27 15:57:11 · 8 answers · asked by Anonymous in Mathematics

(5.2 x 10^-7)(5.2 x 10^2) i think the answer is 2.704 x 10^-4
but i need to know for sure. its for an online quiz that i cant fail. Please help

2006-11-27 15:56:49 · 5 answers · asked by ? 3 in Mathematics

2006-11-27 15:54:40 · 2 answers · asked by renu m 1 in Mathematics

x(t)=-t/2 y(t)=t^2

2006-11-27 15:53:26 · 2 answers · asked by louie 1 in Mathematics

why do different cells have different protiens? what is the difference.

2006-11-27 15:53:13 · 6 answers · asked by CHANDRAVADAN P 1 in Biology

You are purifying 10g of Compound A contaminated wid 1g of Compound B
Solubility of A: at 0 celsius, 0.1g/100mL at 100 celsius 7 g/100mL
Solubility of B: at 0 celsius, 0.9g/100mL at 100 celsius 1.3 g/100mL

a.)calculate minimum volume of ethanol that you will nid to completely dissolve the sample
b.)Calculate % recovery of A upon crystallization, disregarding experimental losses
c.)Is A pure after crystallization?
d.)Is A pure after crystlztion if A (10g) is contaminated wid 1.5 g of B? wat is d % of A in d crystallized prodct?

2006-11-27 15:52:49 · 2 answers · asked by john m 1 in Chemistry

or does someone have 1?

2006-11-27 15:51:01 · 1 answers · asked by J D 1 in Astronomy & Space

2006-11-27 15:50:33 · 2 answers · asked by Lindsay A 1 in Chemistry

I'm an electrical engineering student but I want to switch to civil but many people told me that civil engineers have to work outside all day and I hate the sun and the heat and I like to work in an office with air conditionated.WHAT DO YOU THINK????ANY ADVICE????

2006-11-27 15:46:39 · 9 answers · asked by The Apostle 2 in Engineering

2006-11-27 15:46:08 · 9 answers · asked by June T 1 in Biology

2006-11-27 15:45:15 · 11 answers · asked by Lindsay A 1 in Medicine

Hey all I'm having some trouble with evaluating this integral. Any help is deeply appreciated.

Evaluate the following integral:
int=integral

int[1/(5(e^x)+2) dx]= ?

Thanks in advance

2006-11-27 15:45:14 · 4 answers · asked by mk3oarder 1 in Mathematics

I am struck by the apparent contradiction that a photon or light wave can have enough energy to travel such vast distances and yet have so little energy that it can be interrupted so easily.

2006-11-27 15:44:02 · 8 answers · asked by Wannano 1 in Physics

Use completing the square to show that the x-intercepts of y+ax^2+bx+c occur at the value x= (negative b plus or minus the square root of b squared minus 4ac) divided by 2a.

If you can't type it out can you find a site where it shows how to do this step by step? Thanks in advance.

2006-11-27 15:43:36 · 3 answers · asked by culture_killer 3 in Mathematics

2006-11-27 15:41:49 · 5 answers · asked by Anonymous in Chemistry

2006-11-27 15:40:44 · 3 answers · asked by Lindsay A 1 in Chemistry

Assign an oxidation number to each atom in the following compound.


PbO2

Answer Format:


For KMnO4 the correct answer would be +1 +7 -2 for the elements K Mn and O respectivley.


That is, you must type in the oxidation numbers for each element in the compound
(reading from left to right)

Put one and only one space between each oxidation number, and include the sigh + or -,
as in the example answer format above

2006-11-27 15:40:10 · 3 answers · asked by nietzsche 1 in Chemistry

A calculator manufacturer performs a test on its calculators and finds their working life to be normally distributed, with a mean of 2,150 hours and a standard deviation of 450 hours. What should the manufacturer advertise as the life of the calculators so that 90% of the calculators are covered?

2006-11-27 15:40:06 · 2 answers · asked by John D 1 in Mathematics

In terms of temperature measurement

2006-11-27 15:37:39 · 11 answers · asked by nerd 1 in Physics

I was wondering, in mph or some other form of measuring speed like miles per hour, at what speed does blood circulate through your body?

The other day I accidentally got a big whiff of cleaning solution and it literally went "right to my head".

I know that the time it takes for oxygen to from your lungs to reach your brain has to be a matter of seconds after you inhale because the pulmonary circuit is very short in comparison with the systemic circuit, but I was wondering what the "speed" of blood was?

2006-11-27 15:36:50 · 3 answers · asked by SRS 2 in Biology

2006-11-27 15:36:20 · 4 answers · asked by Anonymous in Chemistry

Hector is performing a chemistry experiment that requires 140 ml of a 30% copper sulfate solution. He has a 25% copper sulfate solution and a 60% copper sulfate solution. How many milliliters of each solution should he mix to obtain the needed solution? I know that the answer is 120 ml of the 25% solution, and 20 ml of the 60% solution, but I can't come up with an equation. Any help you can provide would be very much appreciated.

2006-11-27 15:35:11 · 5 answers · asked by kkneisler 5 in Mathematics

2006-11-27 15:32:02 · 10 answers · asked by Mr Brightsides 2 in Other - Science

all the inf ou know ??

2006-11-27 15:30:27 · 2 answers · asked by wow!! 1 in Geography

An alloy of metals is 25% copper. Another alloy is 50% copper. How much of each alloy should be used to make 1000 grams of an alloy that is 45% copper? I know that the answer is...200 gr. of the 25% alloy and 800 gr. of the 50% alloy, but I can't come up with an equation to solve it. Any help would be so appreciated!

2006-11-27 15:29:56 · 5 answers · asked by kkneisler 5 in Mathematics

A friend agave me this puzzling proof that 1=1=3. It sounds stupid but look:
x = y
-x2= -xy
x2 - y2 = x2 - xy
(x + y)(x - y) = x(x - y)
x + y = x
1 + 1 =2
2 = 1
I can't believe it!

PS the "2" at the end is a "squared."

2006-11-27 15:29:25 · 10 answers · asked by Anonymous in Mathematics

Which of the following statements are true for the reaction


Ca(OH)2(aq) + HCl(aq) -->



a) Water is a product

b) When balanced the coefficient of HCl(aq) is 3

c) The molecular equation is the net ionic equation

d) Ca(OH)2(aq) appears in the net ionic equation

e) H2O(l) appears in the net ionic equation

Examples of species are (aq) (s) (l) etc.


you must enter all true statements in one lower case group,
in alphabetical order with no spaces
e.g., if a) b) and e) are true you would enter abe

2006-11-27 15:29:24 · 2 answers · asked by nietzsche 1 in Chemistry