Post by: joechan521 on November 05, 2007, 03:45:28 pm
many people did well in my class.
here are my answers that i wrote down on the formulae sheet and took out, but dont have working outs...
correct me if im wrong
Q1 2CIS[PI/2]
Q2 b) z= 2i, -2i, rt5 - i
Q3 y=3x-3
Q4 volume = [pi loge 3]/2
Q5 a) a= -8/3 m/s^s
b) mu = 8/[3g]
Q6 a) r(t) = 2cos[2t]i+3sin[2t]j
b) [x^2]/4 +[y^2]/9 =1 ( i wrote the domain and range wrong for this q, do u think they will take away marks?)
c) graph of half elipse
Q7a) 131/110
b) loge(1.2)+1
Q8b) y=tan[x/2-pi/4]
Q9 a= -r
Q10 sinx= 1/3
Made sticky by Ahmad
Post by: AppleXY on November 05, 2007, 03:50:35 pm
Post by: BenBenMan on November 05, 2007, 03:53:25 pm
Post by: enwiabe on November 05, 2007, 03:54:13 pm
Post by: joechan521 on November 05, 2007, 03:56:21 pm
Quote from: "BenBenMan"
It was tricky but not bad .. however I know I screwed up the last question (got a really messy quadratic, didn't realise you had to get cos2x then from that get sinx ..) and the solving the polynomial over C in question 2. Plus I kinda borked the slope field. Meh, oh well, I think I did well enough. :P
i was able to solve it with quadratic,
found tanx from double angle formulae, then draw the triangle to find sinx
anyone know whether i'll loss mark for writing down the wrong domain and range, when they are not asked for?
Post by: cara.mel on November 05, 2007, 03:57:03 pm
7b I knew I got wrong about 2 minutes after I left the room, forgot about the +1 xDxD
Q8 I was like 'omg. Go back to exam 2 you stupid freaking slope field'. Made a decent attempt at it though
Q10 I think I have done completely wrong now xD
I tried to get in form a tan^2 x + b tan x + c, do quad stuff, get tan x, then draw triangle for sin x. My answer had a sqrt in it =/
Post by: Ahmad on November 05, 2007, 03:59:04 pm
Post by: Matt89 on November 05, 2007, 03:59:31 pm
Quote from: "joechan521"
anyone know whether i'll loss mark for writing down the wrong domain and range, when they are not asked for?
I dont think so. But if you got the domain and range wrong, the part where you graph it would be wrong so you'd lose marks there
Quote from: "joechan521"
Q9 a= -r
Did anyone else find that question a little too easy? I'm not trying to sound smart, but it was worth 3 marks and barely required any working out.
Post by: Ahmad on November 05, 2007, 04:00:20 pm
Quote from: "joechan521"
Quote from: "BenBenMan"It was tricky but not bad .. however I know I screwed up the last question (got a really messy quadratic, didn't realise you had to get cos2x then from that get sinx ..) and the solving the polynomial over C in question 2. Plus I kinda borked the slope field. Meh, oh well, I think I did well enough. :P
i was able to solve it with quadratic,
found tanx from double angle formulae, then draw the triangle to find sinx
anyone know whether i'll loss mark for writing down the wrong domain and range, when they are not asked for?
Sometimes and examiners are picky and want domain for these. It was 2 marks, so I assume they probably only want the cartesian equation, and PERHAPS the domain. I didn't put the range, I think the range is tested out in the graph anyway.
Post by: BenBenMan on November 05, 2007, 04:00:45 pm
Quote from: "Matt89"
Did anyone else find that question a little too easy? I'm not trying to sound smart, but it was worth 3 marks and barely required any working out.
That one was too easy. :)
Post by: joechan521 on November 05, 2007, 04:01:50 pm
Quote from: "Matt89"
Quote from: "joechan521"anyone know whether i'll loss mark for writing down the wrong domain and range, when they are not asked for?
I dont think so. But if you got the domain and range wrong, the part where you graph it would be wrong so you'd lose marks thereQuote from: "joechan521"
Q9 a= -r
Did anyone else find that question a little too easy? I'm not trying to sound smart, but it was worth 3 marks and barely required any working out.
i drew the graph with x{ [-2,2] y{[0,3]
yeah Q9 was too easy, i didnt write much working out either
i think u need to write something like x'=-y y'=x
Post by: enwiabe on November 05, 2007, 04:02:12 pm
Post by: joechan521 on November 05, 2007, 04:12:22 pm
i drew lines at all 25 points,
let the numbers be the gradient
2 2 2 2 2
1 1 1 1 1
.5 .5 .5 .5 .5
1 1 1 1 1
2 2 2 2 2
is this correct?
Err.. 2.5 instead of 2? lol it should be 2.5! i thought it was 2, but anyway examiners can't tell from the drawing
Post by: Matt89 on November 05, 2007, 04:12:55 pm
Post by: joechan521 on November 05, 2007, 04:15:06 pm
Quote from: "Matt89"
Did anyone else have trouble drawing the Tan graph on the slope field? without a scale in terms of pi, i had no idea :?
just draw roughly and let pi equal a bit more than 3
did u guys draw asymptoes/intersects ? its a bit too much working for a 1mark question.
Post by: Ahmad on November 05, 2007, 04:17:13 pm
Quote from: "joechan521"
the slope field was a strange question.
i drew lines at all 25 points,
let the numbers be the gradient
2 2 2 2 2
1 1 1 1 1
.5 .5 .5 .5 .5
1 1 1 1 1
2 2 2 2 2
is this correct?
2.5 instead of 2
Post by: Markos on November 05, 2007, 04:19:25 pm
:oops:
Post by: bilgia on November 05, 2007, 04:25:05 pm
Quote from: "Ahmad"
Full marks, it seems. Hope my working out is OK for examiners. Discuss more soon, gotta eat.
as expected...lol
i got everything xcept last qn which i made it halfway thru and couldnt see the simple thing i had to do..so cut at that...
im looking at anywhere between 36-38/40 including simple mistakes (which i have yet to find....)
Post by: boulos90 on November 05, 2007, 04:25:09 pm
i lost 4 marks all together, chances of getting 40+ raw goneeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Post by: asa.hoshi on November 05, 2007, 04:29:49 pm
pity that i dont have a scanner!!!LOL
i think i passed. hopefully 30+/40.
q.1 - did well. 4marks
q2a - good. 1 mark
b. - not sure but i showed some working out. i'll say 0 marks.
3. good. 3 marks.
4. good. 4 marks.
5a and b. good. 4 marks.
6.a, b, c good. 6 marks.
7a. attempted.got a weird answer. but forgot how to do Euler's method properly. ><. FUCKEN HELL! i feel so dumb. didnt have enough time also. so i'll say 0 marks.
b. solved it. i should get consequential marks. 2 marks.
8a. i drew a table with values. then should that it was gradients. messy though but readible. 1 mark.
b. solved it. i think i got it right. but i should get 2 marks minimum anyway.
c. sketching... easy. 1 mark
9. a. didnt show it was in terms of r. hence i lose 1 mark. got 2 marks probably.
b. solved it. 3 marks.
so i'll be expecting to get around 33/40. According to last year's paper, 32+ out of 40 is an A. so I hope that it was enough to get an A.
:)
Post by: Collin Li on November 05, 2007, 04:34:00 pm
Quote from: "asa.hoshi"
i got the exam paper in front of me.
OMG! Try to get it on electronics ASAP. I'd like to beat iTute to a set of solutions PLEASE!
Post by: melodrama on November 05, 2007, 04:39:30 pm
Post by: melodrama on November 05, 2007, 04:40:21 pm
Post by: Sheikh05 on November 05, 2007, 04:47:15 pm
Post by: vce_2007 on November 05, 2007, 04:55:42 pm
and i didnt do part c of that question
and i didnt do the last last question...b/c i ran out of time :S
and for some reason i got 121/100 for the euler's method
but apart from that i think i got them all right
AHHHHHHHHHHHHHHH im so sad atm, my tummy feels bad...im about to cry
i wanted 40+ so bad....now im very scared....
Post by: melodrama on November 05, 2007, 05:00:41 pm
Post by: bilgia on November 05, 2007, 05:03:11 pm
btw were we asked to draw up a slope field table? or just draw it in?
cos i didnt write 2.5,2,1 etc..
Post by: Ahmad on November 05, 2007, 05:12:57 pm
Quote from: "bilgia"
i dont think it asked for that
btw were we asked to draw up a slope field table? or just draw it in?
cos i didnt write 2.5,2,1 etc..
There was no room for a table. I just showed some little working out on the side.
Post by: Ahmad on November 05, 2007, 05:13:29 pm
Quote from: "melodrama"
OMG in my sentence answer, i didn't state the direction of acceleration (but got a=-8/3).. they arent gonna take a mark off for that are they
I doubt it. I wrote -8/3 m/s^2 (opposite to motion).
Post by: bilgia on November 05, 2007, 05:19:23 pm
Quote from: "Ahmad"
Quote from: "bilgia"i dont think it asked for that
btw were we asked to draw up a slope field table? or just draw it in?
cos i didnt write 2.5,2,1 etc..
There was no room for a table. I just showed some little working out on the side.
would it be safe to assume they just wanted u to draw it in?
Post by: Matt89 on November 05, 2007, 05:21:59 pm
Quote from: "bilgia"
i dont think it asked for that
btw were we asked to draw up a slope field table? or just draw it in?
cos i didnt write 2.5,2,1 etc..
I think it would be unreasonable to ask for working out when they dont give any room for it
Quote from: "melodrama"
OMG in my sentence answer, i didn't state the direction of acceleration (but got a=-8/3).. they arent gonna take a mark off for that are they
I dont think they should because the diagram showed the direction of motion, so IMO it isnt necessary to state it (i didnt write the direction, so i'm hoping im right :) )
Post by: cara.mel on November 05, 2007, 05:23:19 pm
1. I can't simplify (2/4sqrt 2 I am assuming I wrote)
2. I can't square my unsimplified answer 4 sqrt 2 properly either (I am thinking that turned into 64.)
Hopefully they will have pity on me and I will get 2/3 not 1/3, because I am thinking I found tan x properly, just in an unsimplified form. I sure bloody hope so anyway.
So annoyed at myself. Last year I wrote d(6x^3)/dx=12x^2 and I wanted so badly to not repeat something similar, this was near the end of a question but so if I am lucky I will get 2/3 for method. Sure hope so...
so 37/38 plus I am not at all confident on the slope field. wooo.
Oh and my internet keeps going on and off, really want to kick it. None of the random neighbour's wireless signals I can pick up it won't let me connect to either. ISP said it was their bad, stupid twits.
Edit: I think I drew the slope field stuff right then ^_^
Edit: I forgot about the dilation of tan on the slope field xD so 36/37 =[
Post by: Freitag on November 05, 2007, 05:41:48 pm
Damn me.
Other then that, forgot the domain & range of the graph, but part c should be considered a consequential error because of that, shouldn't it?
Post by: Ahmad on November 05, 2007, 05:47:14 pm
Quote from: "Freitag"
I left question one out of cis (polar) form >_<.
Damn me.
Other then that, forgot the domain & range of the graph, but part c should be considered a consequential error because of that, shouldn't it?
Yep. My guess is cartesian equation gives you the 2 marks. And the domain + range is handled in the graph. It'd be ridiculous to lose double time simply because you made one error. Though it could happen :)
Post by: Freitag on November 05, 2007, 05:49:00 pm
Post by: Kopite on November 05, 2007, 06:05:11 pm
Post by: cara.mel on November 05, 2007, 06:09:13 pm
Quote from: "Kopite"
does any1 noe where all the stats are from previous years??? like what score got u wat grade??
http://www.vcaa.vic.edu.au/vce/statistics/2006/statssect3.html
Don't ask me how to get to it by clicking links (I've only managed that once, from looking about 10 times), it works when you change the years thank god theyre consistent with naming
Post by: Bombers on November 05, 2007, 06:33:13 pm
Quote from: "cara.mel"
Quote from: "Kopite"does any1 noe where all the stats are from previous years??? like what score got u wat grade??
http://www.vcaa.vic.edu.au/vce/statistics/2006/statssect3.html
Don't ask me how to get to it by clicking links (I've only managed that once, from looking about 10 times), it works when you change the years thank god theyre consistent with naming
Anyone with the exam, i want to know how many marks i lost. :roll:
Post by: gfb on November 05, 2007, 06:51:41 pm
What grade ( e.g A B or C) am i looking at if i get 25/40 in this exam??
Post by: Matt89 on November 05, 2007, 06:54:51 pm
Quote from: "gfb"
What grade ( e.g A B or C) am i looking at if i get 25/40 in this exam??
Last year, that would have been a B
Post by: gfb on November 05, 2007, 06:56:35 pm
Quote from: "Matt89"
Quote from: "gfb"What grade ( e.g A B or C) am i looking at if i get 25/40 in this exam??
Last year, that would have been a B
I hope its a B :)
Post by: Bombers on November 05, 2007, 06:56:45 pm
Quote from: "Matt89"
Quote from: "gfb"What grade ( e.g A B or C) am i looking at if i get 25/40 in this exam??
Last year, that would have been a B
I fink i will get that.
Post by: gfb on November 05, 2007, 07:03:51 pm
Quote from: "Bombers"
Quote from: "Matt89"Quote from: "gfb"What grade ( e.g A B or C) am i looking at if i get 25/40 in this exam??
Last year, that would have been a B
I fink i will get that.
I think we are in the same boat :lol:
Post by: Collin Li on November 05, 2007, 07:42:06 pm
I won't post them unless people have any specific requests for working. Sorry to asa.hoshi for typing out the soft-copy of the paper for me. I will not do maths solutions anymore, because typesetting is a pain in the ass on the computer.
I promise I will do it for Chemistry though, and possibly Physics.
Post by: melodrama on November 05, 2007, 07:51:53 pm
Post by: melodrama on November 05, 2007, 08:02:43 pm
POST POST POST
Post by: Ahmad on November 05, 2007, 08:22:27 pm
Post by: melodrama on November 05, 2007, 08:30:06 pm
YOU READING THIS, DAN?
Post by: JohnS on November 05, 2007, 08:44:08 pm
i didn't get the answer, but i drew out the right triangle and had working using lots of the different trig theorums. how many marks will i get?
Post by: Ahmad on November 05, 2007, 08:45:55 pm
Post by: bilgia on November 05, 2007, 08:50:48 pm
Quote from: "JohnS"
hey for the last question\
i didn't get the answer, but i drew out the right triangle and had working using lots of the different trig theorums. how many marks will i get?
very much similar to what i had..LOL
Post by: JohnS on November 05, 2007, 08:52:22 pm
Post by: boulos90 on November 05, 2007, 10:40:18 pm
Post by: Ahmad on November 05, 2007, 10:43:16 pm
Post by: AppleXY on November 05, 2007, 10:52:59 pm
"made sticky by Ahmad"
Its surely very sticky now. :D ;) :P
Post by: AppleXY on November 05, 2007, 10:54:20 pm
Post by: Collin Li on November 05, 2007, 11:07:14 pm
Post by: Collin Li on November 05, 2007, 11:07:44 pm
[/hypocrisy]
Nuh uh, I followed by example. Dan, he's a bad example! :P :twisted:
Post by: Collin Li on November 05, 2007, 11:43:48 pm
Quote from: "Ahmad"
Cuz we're cool, and stuph. Ain't that right Coblin?
We're cool and stuph.
Post by: *insert witty name here* on November 06, 2007, 09:16:03 am
anyone know how much that tan graph we had to draw was worth?
Post by: *insert witty name here* on November 06, 2007, 09:18:22 am
Quote from: "boulos90"
What u guys rekon the cut off for A+ will be this year, last year it was 73/80
i say so. 'boulos' your name sounds so familiar! hey, is that your surname..and do you go to mazenod?!
Post by: *insert witty name here* on November 06, 2007, 09:23:12 am
Post by: cara.mel on November 06, 2007, 09:24:41 am
Quote from: "*insert witty name here*"
peeps,
anyone know how much that tan graph we had to draw was worth?
1 mark.
glad it wasn't more, someone completely forgot the 1/2 bit when drawing it ^_^
Oh question:
For the last one I am sure I had tan x = (-14 ? 18 )/ 8 sqrt 2, tan x = 4/8 sqrt 2 because it has to be +ve, after that I am not too sure what I did
Would I get 1 or 2 marks for getting tan x in an unsimplified form, and trying to draw a triangle to find sin x but completely stuffing up everything past there (I think (4 rt 2)^2 ended up being 64 x_X)
Post by: boulos90 on November 06, 2007, 09:30:24 am
Quote from: "*insert witty name here*"
Quote from: "boulos90"What u guys rekon the cut off for A+ will be this year, last year it was 73/80
i say so. 'boulos' your name sounds so familiar! hey, is that your surname..and do you go to mazenod?!
Nah thats my Lebanese name, and no i don't go to mazenod, lol havent even heard of that school!
Im feeling shitty, not because i think ive dropped about 5 marks on this exam, but because if ive dropped 5 marks on "Exam 1" imagine how much i'd drop on exam 2
Post by: Collin Li on November 06, 2007, 09:42:24 am
Quote from: "*insert witty name here*"
peeps,
anyone know how much that tan graph we had to draw was worth?
1 mark.
Post by: joechan521 on November 06, 2007, 09:45:23 am
and also the part of the graph at the left of the asymptote?
Post by: Ahmad on November 06, 2007, 09:50:44 am
And we know the range of Arctan[y].
-pi/2 <= Arctan[y] <= pi/2
-pi/2 <= x/2 - pi/4 <= pi/2
-pi/2 <= x <= 3pi/2
Post by: joechan521 on November 06, 2007, 09:56:07 am
Quote from: "Ahmad"
x/2 - pi/4 = Arctan[y]
And we know the range of Arctan[y].
-pi/2 <= Arctan[y] <= pi/2
-pi/2 <= x/2 - pi/4 <= pi/2
-pi/2 <= x <= 3pi/2
arghh shit, i knew there was something dodgy about my graph
Post by: Galelleo on November 06, 2007, 10:19:03 am
Also, did anyone else find that to be rather lengthy compared to previous years :P?
gl all with exam 2
Post by: joechan521 on November 06, 2007, 10:31:34 am
Quote from: "Galelleo"
On the final question, how many marks will i get for drawing the tan2x triangle, and then using both cos2x and sin2x to make up a simultaneous equation that would have eventually given me sinx, if i hadnt run out of time.
Also, did anyone else find that to be rather lengthy compared to previous years :P?
gl all with exam 2
i think definently 1 mark, 2 marks depence where u up 2 in your working
i didnt think u need sin2x, just use cos2x = 1-sin^2(x)
and exam2 is ages away
Post by: Galelleo on November 06, 2007, 11:12:38 am
cheers... hey i hear you know Sleepii ;P?
Post by: Bombers on November 06, 2007, 11:15:26 am
Quote from: "Galelleo"
damn, didnt even think of that at the time... ah well.
cheers... hey i hear you know Sleepii ;P?
What did evryone get for question three.
The equation of the tangent.
I got y=3(x-1)
Post by: Galelleo on November 06, 2007, 11:27:57 am
3=3(2)+c
3=6+c
c=-3
soooo
y=3x-3
=3(x-1)
Post by: joechan521 on November 06, 2007, 11:42:39 am
Quote from: "Galelleo"
damn, didnt even think of that at the time... ah well.
cheers... hey i hear you know Sleepii ;P?
sleepii ??? u mean leslie from my school?
Post by: Galelleo on November 06, 2007, 11:49:10 am
he was just talking about you + spec exam 1 :P
Post by: joechan521 on November 06, 2007, 11:56:38 am
Quote from: "Galelleo"
yeah lol
he was just talking about you + spec exam 1 :P
he doesnt do spec, and who r u?
Post by: Galelleo on November 06, 2007, 11:57:59 am
He was just talking about (you+spec exam 1)
me? I'm just a online-friend of his :S.
he referred me to site when i was takling him about his further exam, then about my spec maths exam.
Post by: joechan521 on November 06, 2007, 12:00:35 pm
Post by: *insert witty name here* on November 06, 2007, 01:25:33 pm
Quote
Nah thats my Lebanese name, and no i don't go to mazenod, lol havent even heard of that school!
no wonder. i'm egyptian that's why the name sounds familiar haha ^^
Post by: Ahmad on November 14, 2007, 02:02:49 pm
He marked last years paper, and had many 40/40s. He said this year people performed worse. Hopefully the cutoff will be low (Y).
Post by: asa.hoshi on November 14, 2007, 02:25:36 pm
Quote from: "Ahmad"
My teacher marked 350 papers and got 0 perfect scorers. He said many people who got 39 lost a mark for the tan graph. Apparently they were really critical about it. *gulps*omg serious?
He marked last years paper, and had many 40/40s. He said this year people performed worse. Hopefully the cutoff will be low (Y).
Post by: Ahmad on November 14, 2007, 02:28:12 pm
Post by: cara.mel on November 14, 2007, 05:55:50 pm
Post by: asa.hoshi on November 14, 2007, 07:12:29 pm
Post by: Collin Li on November 14, 2007, 07:23:59 pm
Quote from: "asa.hoshi"
tsfx did worked solutions for spesh exam 1... like 10days after when itute has done it.
Haha, FSN did them first :) I woulda typed them out nicely, if someone shows me an accessible way of doing it. I can't stand using LaTeX... I just hate how it automatically makes huge gaps and lines, can someone explain how to stop this?
Post by: Ahmad on November 14, 2007, 07:27:10 pm
Post by: asa.hoshi on November 14, 2007, 08:07:23 pm
Quote from: "Ahmad"
Seriously learn latex, it's what many professional scientists + mathematicians use.does this forum have latex? i sorta know how to do it...
let me try
Post by: asa.hoshi on November 14, 2007, 08:08:02 pm
Quote from: "asa.hoshi"
Quote from: "Ahmad"Seriously learn latex, it's what many professional scientists + mathematicians use.does this forum have latex? i sorta know how to do it...
let me try
i guess not. :roll: