How was it ? CSSA Trial (2 Viewers)

[Rahul]

how did everyone go on the last page?

i am pretty sure i got whole of the projectile motion, that was weird as i studied that jus during the morning. i was happy when 2U = V worked out

as for the induction, i couldnt do the last part.

but i left out quite a bit, rates of change, got the 3d trig wrong and other mistakes. i'll prolly get around mid-60's i think

 

[eszty]

I couldnt do 3D in the exam but figured it out when I got home. h=0.2m (it looks wrong though).
I used the sine rule and expressed AC and BC in terms oh h then ABS is just a rght angle triangle?

 

[iambored]

Originally posted by Rahul
how did everyone go on the last page?

i am pretty sure i got whole of the projectile motion, that was weird as i studied that jus during the morning. i was happy when 2U = V worked out

as for the induction, i couldnt do the last part.

but i left out quite a bit, rates of change, got the 3d trig wrong and other mistakes. i'll prolly get around mid-60's i think

umm i cant remember the last page. i remember working on it though

Originally posted by eszty
I couldnt do 3D in the exam but figured it out when I got home. h=0.2m (it looks wrong though).
I used the sine rule and expressed AC and BC in terms oh h then ABS is just a rght angle triangle?

yeah u express the 2 sides in terms of h, then the bottom triangle is rt.angled and they had given u the length of the hypotenuse so its just pythag. i dnt think u needed the sine rule.

 

[eszty]

How did u express the sides?, if u didnt use the sine rule?

For that first part of Q7 did u have a constant for part 2? Iam sure i stufed it up but just wondering...

 

[SoCal]

Originally posted by underthesun
How to integrate inverse cos:

y = cos^-1(sqrt(x))

cos y = sqrt(x)
x = cos^2 y

then integrate it from 0 to pi/2

Me, and a friend got pi/4, for both the approximation questions. So i'm sure that's the right answer..

AHHHHHHHHHHHHHHHHHHHH
lost one mark over forgetting to write domain and range
AHHHHHHHHHHHHHHHHHHHHHHH

Far out! I swear I have never been taught how to do that.

 

[Huy]

Originally posted by Merethrond
Far out! I swear I have never been taught how to do that.

Yeah it's one of the rules.
I bummed out on the Ext 1 Paper, but I can remember being taught about the re-arranging and squaring both sides bit.

 

[underthesun]

especially if you've drawn the graph. Integrating vertically (using y instead of x) would still get you the same answer

damn.. i could have done that induction part, was just lost in the way
(hope i got a free mark tho )

 

[SoCal]

Originally posted by underthesun
especially if you've drawn the graph. Integrating vertically (using y instead of x) would still get you the same answer

damn.. i could have done that induction part, was just lost in the way
(hope i got a free mark tho )

Did anyone get that Induction question out? I was so close.

 

[iambored]

Originally posted by eszty
How did u express the sides?, if u didnt use the sine rule?

umm.. tan(degrees) = opposite / adjacent... omg, were those right angled triangles??? they better have been!!

edit: i'm pretty sure they were right angled. the sine rule probably worked anyway

 

[ToRnaDo]

whats the Induction Question?? i forget already?? Post it??? i want to do it now. Mann i never unfinish Induction Qs but this time its damn hard :-(

 

[Huy]

Originally posted by ToRnaDo
whats the Induction Question?? i forget already?? Post it???

I don't think anyone would remember these questions, DAYS after the exam.

but the first part was:
loge(n!) > n for n>=6

 

[iambored]

oh yeah, with induction u can get 3/4 or 2/3 anyway, so its all good

yeah the 2nd part was something like
(1!) + (2!) + (3!) .... ohh i dnt even know if there were the pluses between them and i can't remember how it finished

 

[SoCal]

Our school must have changes the induction question because ours was different. I have the paper sitting right in front of me, so this is the question we were given:

Use the method of proof by induction to show that

1 + 7 + 19 + .... + (3n^2 - 3n + 1) = n^3

 

[Huy]

Originally posted by Merethrond
Our school must have changes the induction question because ours was different.

Nope, that wasn't in the CSSA Ext1 Trial.

 

[Ragerunner]

i remember seeing the induction question

i subbed n=1 to prove true

i get 1<0 so i got it wrong

lolol i laughed then moved on

 

[Huy]

Originally posted by Ragerunner
i remember seeing the induction question
i subbed n=1 to prove true

LOL you start from n = 6
loge(6!) > 6

but hey, you've probably kicked my butt in other questions tenfold!

 

[Ragerunner]

nah i might get zero for non serious attempts.

some projectile motion question i put 10000000000000000000 light years as my answer :/

 

[nerdd]

Originally posted by Merethrond
Far out! I swear I have never been taught how to do that.

isn't it kinda common sense....?
that if y=cos^-1 (blah)
then cos y = blah??
surely you would've been taught that!

 

[tigerboi]

ahh that test was bs. the maths coordinator should of took out some parts. pos!!

 

[Huy]

Originally posted by tigerboi
ahh that test was bs. the maths coordinator should of took out some parts. pos!!

Quit your whining, I beat you
...Sorry

All CSSA trials were bloody hard this year!
Maybe not Physics, but the Chemistry one and Maths ones were hard (to me)