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Hey guys, could u have a look at this question? <a href="http://www.codecogs.com/eqnedit.php?latex=\\$A small amount of pure sodium metal is dropped ino 1.2L of water. The reaction is summaries in the following equation...

*all organic acids are weak (don't ionise 100%)

/unaware

Re: 2012 HSC MX2 Marathon m8. please explain

http://lmgtfy.com/?q=cd-rom

Re: HSC 2012 Chemistry Marathon (i) According to the Bronsted-Lowry Theory of acids and bases, an acid is a proton donor and a base is a proton acceptor. (ii) In reaction (1), HCO_3^- acts as a base. It accepts a proton from H_3O^+, resulting in the H_2CO_3. In reaction (2) HCO_3^- acts as an...

Re: 2012 HSC MX2 Marathon P(acos\theta,bsin\theta)\\\therefore m_{tangent}=\frac{bcos\theta}{-asin\theta}\\\therefore $Equation of OQ $\Rightarrow y=-\frac{bcos\theta x}{asin\theta}\\$Sub into $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ and you get $ y=\pm asin\theta $ $ \therefore x=\mp...

for problem 1, i got <a href="http://www.codecogs.com/eqnedit.php?latex=A = \frac{1}{2}\sum_{k=1}^{\infty} \frac{1}{\sqrt{n^{2}-k}}" target="_blank"><img src="http://latex.codecogs.com/gif.latex?A = \frac{1}{2}\sum_{k=1}^{\infty} \frac{1}{\sqrt{n^{2}-k}}" title="A =...

lol that's too long for a sentence. work on simplicity and clarity. try splitting it up into a few sentences, like that it loses all its essence after about the 5th comma :P

Re: HSC 2012 Chemistry Marathon (a) The use of beta rays to gauge the thickness of cardboard is most efficient. Beta rays are able to pass through (penetrate) the cardboard, and hence be detected - determining its thickness. (b) Geiger-Muller Counter (c)The Geiger-Muller counter has countless...

no mate, for one coil its 0.04, not 0.004. which book is this from? surfing? cause i know that m&g surfing has a lot of wrong answers

\overrightarrow{OZ} = z is what im talking about; is that wat u mean by combining vector notation with complex numbers? when u say 'not allowed', do u mean not board approved or your not allowed because it wont work?

:spzz: where did u hear that from? all of terry lee's worked examples and solutions in geometrical applications of complex numbers use vector notation

not to mention u did the wrong question :L this stems from the fact that <a href="http://www.codecogs.com/eqnedit.php?latex=\overrightarrow{AZ_1}=Z_1-A\\$and $ \overrightarrow{AZ_2}=Z_2-A" target="_blank"><img src="http://latex.codecogs.com/gif.latex?\overrightarrow{AZ_1}=Z_1-A\\$and $...

Re: 2012 HSC Mathematics Marathon! dont you need to give a distance from A to the house?

Is the method for part (a) to turn it into sigma notation ie <a href="http://www.codecogs.com/eqnedit.php?latex=\sum_{n=1}^{n}n(\frac{1}{2})^{n-1}" target="_blank"><img src="http://latex.codecogs.com/gif.latex?\sum_{n=1}^{n}n(\frac{1}{2})^{n-1}" title="\sum_{n=1}^{n}n(\frac{1}{2})^{n-1}"...

Re: 2012 HSC MX2 Marathon yea sorry, concave right. vertex and focal length were correct?

Re: 2012 HSC MX2 Marathon trueeee. there was a typo in the exercise. i think it should be Re(z) + 2 not 2i. In that case it will be a parabola, focal length 1, vertex (-1,-2) , concave up. right?

Re: 2012 HSC MX2 Marathon <a href="http://www.codecogs.com/eqnedit.php?latex=\\\textup{Sketch the following locus of z on an Argand diagram. }\\\left | z @plus;2i \right |=Re(z)@plus;2i" target="_blank"><img src="http://latex.codecogs.com/gif.latex?\\\textup{Sketch the following locus of z on...

Re: 2012 HSC MX2 Marathon <a href="http://www.codecogs.com/eqnedit.php?latex=\\\textup{A relation is defined implicitly by: }x^{2}@plus;xy-2y^{2}=0.\textup{ Show that }\frac{dy}{dx}\textup{ has only two possible values: 1 and -}\frac{1}{2}. \\\textup{ Hence or otherwise, sketch the relation.}"...