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Wasn't the cathode just hydrogen gas as the platinum acted as a surface for it? And dilute sulfuric acid was used as the electrolyte in it.

lol. there goes a few marks right there. I put Ac-227 :(

The intensity part threw me off as it's intensity changed by 4 fold. It's a weird Question. I put Na-24 because i didn't know the relationship between half-life and intensity plus i though Beta would be stopped by a few sheets of newspaper :(

I got D) lol. Because if you use the equation. You find you have to multiply it by 2. But I could be wrong. What did everyone get for the radiation one?

Re: Australian Mathematics Competition Crap, I got pi-2sqrt(2). lol

Ok nw. btw, 1) has been solved by Gurmies.

there maybe a problem with your solution for 1)

Finally, the genius is back

for 1) Use demoivre's on z^n+conj. z^n where z=cis@ And; e^z+e^(/z) =e^cos@(e^isin@+e^-isin@)

Re: Australian Mathematics Competition Yeah. It's very possible PLUS AMC can be based on a bit of luck. It's not like they check the working for the questions.

Re: How did people go in the maths comp today? Shit. For the n-fold composite one i got as x->inf; f(x)->1. Should have just picked 2^n

Re: Australian Mathematics Competition Thanks Gurmies.

Re: Australian Mathematics Competition What's a prize? (i'm not saying i'll get one.)

Re: Leaving school depression? I can't wait to go to uni. I'm sick of school and most of the shit we learn is useless.

Re: Westpac Maths Comp marathon Yeah it is 11. lol. I counted my solutions in between 5 and 16 incorrectly.

Thanks untouchablecuz and 3unitz.

Q5: bi) Show that the roots of z^10=1 are given by: z=cis(r*pi/5), r=1,2,3,...,9 DONE ii) Explain why the equation ((z-1)/z)^10=1. Only has nine roots. Show that the roots of ((z-1)/z)^10=1 are given by z=(0.5)(1+icot(r*pi/5)), r=1,2,...,9 I can't show that the roots are given by...

oh ok. That's good. Thanks for the help everyone. btw, where did you get the solutions from?

when you download the paper, the file extension is what causes the problem most of the time. Just put an x after .doc on the documents name and it should open.

It's from 2000. If everyone is getting (pi/2)(e^2-3) it might just be a typo.