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Sameee =) But I changed the quote to 1st person..

I can't wait this time tomorrow....I never want to hear the word belonging again

GOODLUCK TOMORROW !!! (not that you need it or anything)

Re: HSC 2013 4U Marathon I don't get what you want me to explain. Like actually define a polynomial and then do some random algebra or just explain what I did in more words?

Re: HSC 2013 4U Marathon Let p(x) have its minimum value point at Q. So p(x)>= p(Q) (1) p(Q)>=p''(Q) ...given (2) p''(Q)>=0 (because its the concavity at the min point of even degree positive coeff. polynomial)...(3) So combining (1), (2) & (3) We get that p(x)>=0 I think my (3) is...

Then you better hope the people above you in physics are beasts :P

Re: MX2 Integration Marathon Is it pi/2 ?? Surprisingly neat after such ugly working out.

re: HSC Physics Marathon Archive I'll try explain it algebraically, y = utsina - ½ gt2 (1) x = utcosa (2) When the particle returns to the ground, y = 0. Substituting this into (1): 0 = utsina - ½ gt2 t (usina - ½ gt) = 0 t = 0 or t = 2usina/g (3) Therefore...

re: HSC Physics Marathon Archive Did you copy the question down wrong by any chance? Is it supposed to be 40 then 50 degrees angle of elevation-->Then there would be identical range as the are both +5 or -5 degrees from 45 degrees.

re: HSC Physics Marathon Archive C-Longer time of flight (increasing angle of elevation increases vertical component of velocity)

If your not too far from first like 1% off or something you'll probably even get the same moderated assessment mark.

Re: HSC 2013 3U Marathon Thread I think you've missed cases like this 3 couples initially: A_A_B_C_B_C Where one D comes and fills the first marker and the second D can choose from the others.

Re: HSC 2013 3U Marathon Thread I think he meant 12 is correct for the latter problem with the men and women alternating, not for the original one you were solving. I'm not sure.

Re: HSC 2013 3U Marathon Thread If this was meant to be *that* question, then I think you copied it down wrong, this was the original: 4 couples are to be seated around a circular table, with men and women alternating. The couples are not allowed to sit next to their partners. Find the...

Re: HSC 2013 3U Marathon Thread I think you've double counted some cases, like the bolded case-->What if in that 5! arrangement two couples who aren't mean to be together are 'accidently' put together, then there's 3 couples together--> a latter case which you account for separately. Also, I...

Doing all 9 is probably not the best way to go, considering your analysis will be too shallow. I'd say 3-4 is more than enough.... and i'm pretty sure that they can specify :(

Re: HSC 2013 4U Marathon Euler's Formula sorry, applying e^{iy}=cos y+isin y But if you didn't think of it, I probably did something retarded...

Re: HSC 2013 4U Marathon Do we have to use Euler's method and compare real part etc. or is there a MX2 way to do it ?

Re: HSC 2013 4U Marathon From your second last step if we rearrange in terms of tan theta then solve for discriminant we get the required expression aswell--> But what that means physically doesn't really make sense to me--> Is it just that yes there's a real value for tan theta so its...

Re: HSC 2013 4U Marathon The letters in the square root are supposed to be gd right? t = d/(Vcosa) --> where a is the varying angle Sub into y = -1/2 gt^2 + Vtsina And let a=45 (minimum conditions for the projectile to hit the wall as range is max at this angle so velocity will the be min...