Cssa Trial Exam (1 Viewer)

[Stefano]

Thanks for checking up on that H.S. Carslaw. (Damn that Cheltenham teacher btw)

 

[lankeytrollies]

That was a easy Cas Trial. Most people at our school recon they got around 60% - 70&

 

[lum]

can someone pm me the solution to 7.biii and 8b...

fuk i forgot what the surface area of a cone is , freakin lost me 3 marks

 

[noah]

3 d ii

perimeter = root(2)pi+4

area = 2+pi

i think

5 iii

use your results from 5 ii and devide them by each other

in 5 ii you should have got

1+4cos@+6cos2@+4cos3@+cos4@=16cos2@(cos@/2)^4 ------ 1

4sin@+6sin2@+4sin3@+sin4@=16sin2@(cos@/2)^4 -------- 2

devide 2 by 1

 

[lum]

We also haven't done the Binomial Theorem, but our school didn't f'en replace it !!! ARGHHH!!!!
I'm annoyed because I didn't realise that it was a binomial theorem and I spent 5-10 minutes on it trying to get it out !!

( If I made NO mistakes i should get 75/120 )

are you talking about 5.bii? you didn't need to use binomial theorm for that, just use pacal's triangle for the expansion, gives u the same thing as using binomial theorem for coefficients.

was this test easier or harder than last yr's? caz i'm no where near the top guy last yr at my school, who got 87% i think, (yes my school ain't very smart)

and 89/120 is bad, caz that's the highest i can get.. i usualy make a LOT of silly mistakes, so yeh.. prolly end up with a narrow pass, which is shat. even 89/120 is shat for some ppl here..

 

[noah]

you can find a surface area exactly the same as you find a volume by slicing

just find the area of the edge of each slice instead of the volume

 

[noah]

pascal's triangle is binomial theorem

 

[David_O]

to the people above: If you made no mistakes, you'd get 120/120 obviously! lol

 

[lum]

lol, i bet they wouldn't be able to figure THAT out

man, bloody surface area is rs pi, damn it, lost 3 easy marks
gay...

@noah - yeh but u dun need to have learnt binomial theorem to use pascal's triangle, afterall, i'm SURE u'd be taught that in complex numbers to expand stuff.

 

[Stefano]

I used Pascal's Triangle ( or part of it lol ) but I thought that the half-angles were alien-like and pressumed them to be some sort of harder 3u binomial (which my school hasn't started)

juhlum - what school do you go to mate? 70-80%.... fxxk (We are talking RAW scores right?)

 

[lum]

yeh, that's.. omgsh, that means i'm not even average at ur school wehn i'm 3rd at mine, DAMN my school sucks

 

[FinalFantasy]

did it juz den... it was ok, except i stuffed up Question 1 LoL

 

[lum]

i know! that stupid double root thing took me so bloody long, and i'm not even sure if my answer was good enuf for a proof question...

i think i spent 30 min on qs 1,.. when it was sposed to be half the time

 

[David_O]

All you needed to say was there is a double root at point of contact where the curves are tangential.

(edit: of course showing that the eqn happened to be solving the 2 curves simultaneously.
ishq: yes)

 

[FinalFantasy]

lol i just ignored question 1 until at the very last minute when i rushed in some answers

 

[ishq]

was m = +/- 2 or something??

David: Yeah to the solving 2 curves....I did that...then substituted the gradient everywhere

 

[lum]

david_0 ... u fuking kidding me, SHIT, this sucks, i could've ... omgsh this sucks

ishq yeh i got +-2 as well
hopefully we're not both wrong, lol

 

[Trev]

I reckon I got full marks in conics and mechanics, close in integration but the rest was pretty screwed
I had no clue for those binomial 'z+1' questions, my graphing is shithouse and urgh.
Bleh

 

[lum]

u sound like you did well, what schools u guys go to?

the locus with the circle, drawing that stupid graph took me 3-4 min,, caz we have to use bloody compasses, or we lose marks... does ur school make u guys do that? and i heard from my tutor in hsc its ok to freehand as long as u put radius, centre, and maybe provide a eqn'.

for probability, did anyone else get p = 2/7 or 3/7? it's something on 7.

 

[trompettiiste]

Particularly horible questions (feel free to post the solutions) :

Question 3; d, ii
Question 5; b. iii
Question 6; b, ii (OMG WTF)

I'm not sure if they are not allowed. But they shouldn't be able to do it; they should, instead, as David_O aptly suggested, get estimates.

Anyways, please refrain from referring to questions directly for another week or so. Use email instead. Thank you.

noah ---> Thanks for the solution. Makes perfect sense to me now.

So u want us to post the solutions on the thread - but then dont post the solutions hmmm