Search results

appears i have the last 2 threads aha i feel needy :O anwho aha when we are doing volume V = pi(integral) y^2 Just say the equation is y=(x^2 - 4) and then we do the volume V=pi(integral) (x^2 + 4)^2 do we have to expand this before integrating i.e. x^4 + 8x + 16 ?? and then wed integrate or...

alrite kool i got it after a while. I think because u do 4unit u left out a few steps thinking id see them aha but all is well now i did: 2^(-2/3) + 2^1/3 = 1/(2^2/3) + 2^1/3 (cross multiplied) = (1+2)/2^2/3 = 3 x 2^(-2/3) :)

thanks heaps you were heaps of help it doesnt make it confusing it made it easier. Well the wikipedia links were confusing so i sorta read only the first paragraphs of each to get the idea. Atleast i know that there are things to explain it that i havent learnt. I thought i should have known it...

i see i didnt quiet get it aha now i do. I didnt realise paired electrons could be from the same atom i.e. oxygen has 6 electrons and 3 pairs, no unpaired; Nitrogen has 5 electrons, 1 unpaired electron and 4 paired. So yeh. i was looking at it as if even though the oxygen has the 2 pairs of...

i changed it once again lol :S i didnt know how to represent it on computer but the main point i dont understand is how they get from the second line and factorise to get 2^2/3 x (2+1)

hello :p thankyou heaps for all u effort it is really helpful :):):) ps whats excess form? so this means the the actual entire number is 0 yeh? so then there shouldnt be numbers in the mantissa ? and then what would be the value for 0? so 256 - 2 special characters = 254. 254/2 = 127 numbers...

i had half sorry its fixed now

haha i drew it but yeh i dont quiet undersand this?

partway through a question they get: (e^ln2)^-2/3 + (e^ln2)^1/3 = 2^-2/3 + 2^1/3 = 2^2/3 x (2+1) <----how do they get this factorisation or whatever they did? = 3*2^(2/3)

yeh thats what i did its a bit longer tho wouldnt you agree :P

thanks heaps i understand now just to clarify: if there different terms we multiply indices yeh? EDIT: when we do (5^2m) = (5^m)^2 so we can sub is this like 5^m x 5^2 which implies we multiply like terms: or is it like: 5^m x 1^2 and as there different terms we multiply to get 5^2m :S

why do u multiply by 5 in the second line :S i understand it is saying: 5^1-2m =5^-2m (do we diregard the 1?:S) = 1/5^2m but i dont know where the 5 comes from for the numberator

i know this should be an easy question. I got it the first time using heaps of logs n what not lol but the answers did it really simply given 5^m = 4, find the value of 5^1-2m answer: 5^m = 4 therefore: 5^1-2m = 5/5^2m <--how do they get this lol :S = 5/(15^m)^2 = 5/16

alrite sweet, yeh your both got eutrophication down pat So from this a chelating agent would also be used in water treatment to remove hardness yeh? or is it added just to detergents n stuff...If so in water treatment any1 know what step? and also: [SIZE=-1] does this mean it could be used...

ah k yeh thanks heaps so its to do with the electrons kool so in nitrogen dioxide if we look at the dot lewis example "http://www.madsci.org/posts/archives/2000-02/951452623.Ch.2.gif" (using the molecule on the right) we see the O to the bottom left has brought 6 e's and attached to the N which...

lol but how can something exist as an ion and then just as a molecular compound like i understand it for say an element like Ag can be Ag or Ag+. but how can a molecule be both?

one is NO2 and the other is NO2-. what makes one an ion and the other a molecule?

any1 know an quantitative way to test for detergent? would it be adding an acid or somthing? and when we titrate a sample with EDTA to determine CaCO3 (ppm) for hardness, i thought we didnt use weak acids as its hard to determine their end point... would any1 like to shed some summary info on...

apparently its an arc examination 2007 sample :S i didnt see that before aha its got this hard question in it no idea lol but then again if its not a legit HSC the algorithms may not be as strightforward or have errors or seomthing. my teacher printed it off for me i shall do the actual 2007 one...

that was the funniest thing i have read in ages lol i was actually laughing ahaha just imagine all those addicted people just seeing dead people around them and then their life going down ahaha like they were loosing their soul ahaha