Post by: kepal5 on November 08, 2010, 02:09:48 pm
Post by: AzureBlue on November 08, 2010, 02:17:25 pm
Post by: Whatlol on November 08, 2010, 02:18:42 pm
Post by: AzureBlue on November 08, 2010, 02:19:48 pm
Does anyone have a scanned copy of the exam yet?
Post by: Whatlol on November 08, 2010, 02:20:11 pm
Post by: AzureBlue on November 08, 2010, 02:21:28 pm
Post by: ZachCharge on November 08, 2010, 02:22:52 pm
Post by: year12 on November 08, 2010, 02:24:56 pm
Post by: Stormer on November 08, 2010, 02:25:19 pm
Post by: eddie10 on November 08, 2010, 02:26:15 pm
Post by: samiira on November 08, 2010, 02:38:01 pm
Post by: sajib_mostofa on November 08, 2010, 02:40:53 pm
Post by: John President on November 08, 2010, 02:41:55 pm
haha I laughed on seeing the pyramid of death after the prediction yesterdayIt's ironic, because it was LITERALLY a pyramid of death as the Egyptian pharaohs were buried in them :P
Post by: JinXi on November 08, 2010, 02:42:42 pm
Post by: Whatlol on November 08, 2010, 02:44:00 pm
Post by: kenhung123 on November 08, 2010, 02:44:47 pm
HAHAHAHAHAhaha I laughed on seeing the pyramid of death after the prediction yesterdayIt's ironic, because it was LITERALLY a pyramid of death as the Egyptian pharaohs were buried in them :P
Post by: John President on November 08, 2010, 02:45:01 pm
pretty sure i got 80/80.Don't count your pyramids before they've been built :P
Post by: minimum on November 08, 2010, 02:45:32 pm
couldn't they have made it easier as it was beginning of CAS. Feel like a freakin' guinea pig.
STUPID VCAA. :tickedoff:
Post by: kazekage on November 08, 2010, 02:51:32 pm
Post by: kiraxxx on November 08, 2010, 03:04:37 pm
Anyone else throw away 13 marks?
yep and perhaps more ><
Post by: Whatlol on November 08, 2010, 03:06:02 pm
pretty sure i got 80/80.Don't count your pyramids before they've been built :P
its more like 40/80 :p
Post by: homedog on November 08, 2010, 03:06:29 pm
Post by: Whatlol on November 08, 2010, 03:07:17 pm
Post by: 98.40_for_sure on November 08, 2010, 03:07:52 pm
i got an answer the length of the page for the volume of the pyrmid LOL
Something with like 3 brackets and root 3's inside?
Post by: JinXi on November 08, 2010, 03:09:12 pm
i got an answer the length of the page for the volume of the pyrmid LOL
Something with like 3 brackets and root 3's inside?
Me2. What was the approx for the volume? I got 250 ish.
Post by: Linkage1992 on November 08, 2010, 03:09:36 pm
i got owned.
Post by: Whatlol on November 08, 2010, 03:10:13 pm
i got an answer the length of the page for the volume of the pyrmid LOL
Something with like 3 brackets and root 3's inside?
Me2. What was the approx for the volume? I got 250 ish.
yea it was about 256... but had a like 3 brackets everything was like squared and CRAZY
Post by: 98.40_for_sure on November 08, 2010, 03:10:46 pm
Post by: sajib_mostofa on November 08, 2010, 03:11:08 pm
Post by: Elnino_Gerrard on November 08, 2010, 03:11:51 pm
Post by: fady_22 on November 08, 2010, 03:13:14 pm
Post by: sajib_mostofa on November 08, 2010, 03:14:00 pm
For the volume I gotand
.
Sounds right
Post by: sooeyy on November 08, 2010, 03:14:14 pm
Finding the height of the pyramid was tricky. I used Pythagoras' theorem,,, anyone else?I did too. You get 10rt sinx^2 - cosx^2..
So you have to simplify that to
10rt 1-2cosx^2 for the next question.
(Y) to those who do spesh! Yay for double angle formulae.
Post by: fady_22 on November 08, 2010, 03:14:23 pm
Post by: curious111 on November 08, 2010, 03:14:51 pm
Post by: Elnino_Gerrard on November 08, 2010, 03:15:10 pm
Did you have to write the answer as 256.6 metres cubed? Or was it ok if you left it asNah exact answer
Post by: Linkage1992 on November 08, 2010, 03:15:19 pm
then i made cosx = 1/9 for some reason NOOOOO
Post by: Stormer on November 08, 2010, 03:15:24 pm
For the volume I gotYup. That's the answer I got.
Well 4000root(1/27)/3
Same thing
Post by: lil_stace on November 08, 2010, 03:15:33 pm
Post by: 98.40_for_sure on November 08, 2010, 03:15:42 pm
Post by: sooeyy on November 08, 2010, 03:15:59 pm
Yay thats what I got.For the volume I got
Sounds right
For the last part of that question...you just had to equate T=
Post by: fady_22 on November 08, 2010, 03:17:10 pm
Yay thats what I got.For the volume I got
Sounds right
For the last part of that question...you just had to equate T=right? And restrict x to [0,pi/2]?
The domain was (pi/4, pi/2). But that's what I did too.
Post by: lil_stace on November 08, 2010, 03:17:15 pm
Anyone else throw away 13 marks?
i think.... but damn the multiple choice was easy!!! and so was question 1 long answer
Post by: snibo23 on November 08, 2010, 03:17:39 pm
Anyone feel that doing spesh was a major advantage for this exam, especially the last question
Post by: 98.40_for_sure on November 08, 2010, 03:17:55 pm
i think i got 0.5x and 1.xx
Post by: fady_22 on November 08, 2010, 03:18:29 pm
Post by: sooeyy on November 08, 2010, 03:18:38 pm
I LOVE SPECIALIST!! HELPED ME SOLVE THE PYRAMID OF DEATHHI5~~~~
Post by: Elnino_Gerrard on November 08, 2010, 03:19:52 pm
i got x=0.80 something and x=1.23
Post by: JinXi on November 08, 2010, 03:20:48 pm
I felt doing further helped me :P doing that pyramid haha
i got x=0.80 something and x=1.23
me222 HI 5
Post by: Elnino_Gerrard on November 08, 2010, 03:22:11 pm
Post by: staffa on November 08, 2010, 03:25:48 pm
This exam will not ruin my mood :D Liverpool 2 Chelsea 0 :D
Arsenal lose and I get that mindfuck of an exam. Not a good day by any means!
Post by: Elnino_Gerrard on November 08, 2010, 03:28:03 pm
Arsenal lost too? oh haahaha exam completely forgottten :DThis exam will not ruin my mood :D Liverpool 2 Chelsea 0 :D
Arsenal lose and I get that mindfuck of an exam. Not a good day by any means!
Post by: slothpomba on November 08, 2010, 03:29:21 pm
haha I laughed on seeing the pyramid of death after the prediction yesterdayHaha as soon as i saw it my jaw dropped... the guys on the forum were right...
more or less :S
i just lost my anal virginity... and it was to vcaa :'(
I still haven't stopped bleeding... :'(
Post by: kepal5 on November 08, 2010, 03:49:10 pm
haha I laughed on seeing the pyramid of death after the prediction yesterdayyeah was reading that i was so lol i should have so put it on
Post by: jaesen on November 08, 2010, 03:53:10 pm
I felt doing further helped me :P doing that pyramid haha
i got x=0.80 something and x=1.23
me222 HI 5
Hey, so did I! : )
I originally had x=2arctan(root 6 - root2 / somethingsomething) but when substituting that into cos(x), expecting a LOT of lag, it came out to be a nice root3/3 from there on, the rest was a lot easier to do, hoho :D
Post by: qwerty0 on November 08, 2010, 03:57:17 pm
about the daughter's damn pyramid that was half the size?
Post by: shoeaddiikt on November 08, 2010, 04:18:43 pm
i just lost my anal virginity... and it was to vcaa :'(
+volume of the pyramid
Post by: charsiuvce on November 08, 2010, 04:20:34 pm
how about the last question of this ?
about the daughter's damn pyramid that was half the size?
i got x=0.81 and x=1.23
can anyone confirm?
Post by: taiga on November 08, 2010, 04:21:23 pm
how about the last question of this ?
about the daughter's damn pyramid that was half the size?
i got x=0.81 and x=1.23
can anyone confirm?
Yeah I got something like that
Post by: 98.40_for_sure on November 08, 2010, 04:21:56 pm
how about the last question of this ?
about the daughter's damn pyramid that was half the size?
i got x=0.81 and x=1.23
can anyone confirm?
Something like that yes
Post by: sajib_mostofa on November 08, 2010, 04:22:39 pm
Post by: charsiuvce on November 08, 2010, 04:47:30 pm
Would I lose marks if I converted the answer to degrees?
as long as you didn't do any calculus with degrees i cant see why that would be wrong.
Post by: Blakhitman on November 08, 2010, 04:52:23 pm
and can anyone remember the equation of the volume?
was it
Post by: 3Xamz on November 08, 2010, 04:52:56 pm
Post by: 3Xamz on November 08, 2010, 04:53:40 pm
did you guys get x=0.9554317??
and can anyone remember the equation of the volume?
was it
PS: They asked for exact values, which was 4000sqrt(3)/27 which is ~ 0.9554317
Post by: footywiz on November 08, 2010, 04:54:43 pm
Post by: Blakhitman on November 08, 2010, 04:56:16 pm
It was that, but 4000 not 400?
ahhh shit, gg -.-
did you guys get x=0.9554317??
and can anyone remember the equation of the volume?
was it
PS: They asked for exact values, which was 4000sqrt(3)/27 which is ~ 0.9554317
Yea I did put cos^-1(blah).
And that was the volume ^
Post by: 3Xamz on November 08, 2010, 05:02:03 pm
Quote
Yea I did put cos^-1(blah).
And that was the volume ^
Sweet as :)
cos^-1(1/root(3))?
Post by: InitialDRulz on November 08, 2010, 05:03:24 pm
Post by: homedog on November 08, 2010, 05:06:01 pm
Post by: becca92 on November 08, 2010, 05:07:38 pm
Post by: Whatlol on November 08, 2010, 05:08:22 pm
Post by: 3Xamz on November 08, 2010, 05:08:44 pm
EDIT: However, the best method was to;
Find the derivative, let the numerator equal zero.
This lead to cos^2(x) = 1/3
Sub that into the volume equation to get; (4000/3)* sqrt[(1/9) - (2/27)]
NOTE: cos^4(x) = (cos^2(x))^2 = (1/3)^2 = 1/9. Much easier than isolating x and subbing back in, same for cos^6(x).
At this step did I use the calculator for the first time, simplifying the above term gave 4000sqrt(3)/27 :)
Post by: stonecold on November 08, 2010, 05:08:50 pm
Post by: homedog on November 08, 2010, 05:10:40 pm
you shoulda seen the answer the class pad pulled out.
were u using classpad 330 because i got no solution. + no one in our school got it and we all use classpad 330, not even the teacher, so i'm think that there might have been a calculator issue on the classpad with this question
Post by: homedog on November 08, 2010, 05:16:28 pm
Classpad 330 for moi.
EDIT: However, the best method was to;
Find the derivative, let the numerator equal zero.
This lead to cos^2(x) = 1/3
Sub that into the volume equation to get; (4000/3)* sqrt[(1/9) - (2/27)]
NOTE: cos^4(x) = (cos^2(x))^2 = (1/3)^2 = 1/9. Much easier than isolating x and subbing back in, same for cos^6(x).
At this step did I use the calculator for the first time, simplifying the above term gave 4000sqrt(3)/27 :)
did u try it on your calculator first and get no solutions or was that just me???
Post by: Whatlol on November 08, 2010, 05:16:53 pm
you shoulda seen the answer the class pad pulled out.
were u using classpad 330 because i got no solution. + no one in our school got it and we all use classpad 330, not even the teacher, so i'm think that there might have been a calculator issue on the classpad with this question
i have the 330 but i got an answer that was the length of the page, but i think it is the correct one, although i doubt VCAA will reward a mark for it
Post by: 3Xamz on November 08, 2010, 05:35:32 pm
Classpad 330 for moi.
EDIT: However, the best method was to;
Find the derivative, let the numerator equal zero.
This lead to cos^2(x) = 1/3
Sub that into the volume equation to get; (4000/3)* sqrt[(1/9) - (2/27)]
NOTE: cos^4(x) = (cos^2(x))^2 = (1/3)^2 = 1/9. Much easier than isolating x and subbing back in, same for cos^6(x).
At this step did I use the calculator for the first time, simplifying the above term gave 4000sqrt(3)/27 :)
did u try it on your calculator first and get no solutions or was that just me???
I've always preferred manual methods over the CAS, and it's been a negative all throughout the year for me. Wasting time doing it by hand when others did it on the calc, but it paid off today! Didn't bother with the calc till I got to that very last part. :)
Post by: supernerd on November 08, 2010, 06:01:38 pm
The Pyramid of Death :DOh my god. Do. Not. Jinx.
this would be hilarious if it wasnt so tragically ironic
Post by: Stormer on November 08, 2010, 06:40:49 pm
I felt doing further helped me :P doing that pyramid hahaI have that, just re did the question and got the same as well. iTute's answers don't seem to correlate though.
i got x=0.80 something and x=1.23
Post by: samiira on November 08, 2010, 06:42:27 pm
LOL!!The Pyramid of Death :DOh my god. Do. Not. Jinx.
this would be hilarious if it wasnt so tragically ironic