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re: HSC Physics Marathon Archive try hsc.csu. They have a good and brief coverage on that dot point

Re: 2015 Business Studies Marathon Can someone please explain to me the difference between polycentric, geocentric and ethnocentric approaches with examples? I'm having a really hard time understanding this concepts.

OKay I think its because since current in flowing from X to Y right, so ur thumb points downwards, hence your fingers curl clockwise.

Can someone please explain why the magnetic field direction is going up? As Kap said, it should aim to oppose the initial change. Or is it because the magnetic field lines leave from north to south, and as north is on top, magnetic fields leave that direction?

Wait I don't get it. If you put your thumb pointing upwards, don't your fingers still curl clockwise? So then how is it anti-clockwise?

B is not a polymer, so that can't be right. The presence of brackets indicates an infinite chain, hence "condensation polymer", it has to be D, shouldn't it?

Got the same answers as you!! :D

I think you might be referring to Q11. I got D as well

Question 14 is the pH range

Multiple choice for my fellow BOSers. http://imgur.com/a/YPzJL

I have the multiple sheet paper. Does anyone want me to upload it?

Was last year's aligning really bad? If it's the same as last year, what shall doth the band 6 mark be?

re: HSC Chemistry Marathon Archive Anyone here doing shipwrecks (or should I say shipwrecked)? Any predictions? I reckon something about great depths and how corrosion was thought to be eliminated and titanic was found blah..blah.

Really? That sucks. I never learnt that cytotoxic T cells could release cytokines. Oh well.

When you say lead acid batteries, they cannot specify a battery, as in the syllabus you get to choose your own batteries to study. Just a note.

Haha exactly right! Thats the problem. You can prove so many questions that may seem wrong. I swear...dont know what bostes was drinking this year.

re: HSC Chemistry Marathon Archive Does a buffer necessarily have to be a weak acid and its conjugate base? Or can it be a weak base and its conjugate acid? Since that's what I learnt.

As cytotoxic T cells do not release cytokine. In biology in focus it says th helper cells release cytokine as a form of interaction when the macrophage presents the antigen.

I believe 17 is B

dammit you beat me to it!