General Thoughts: Mathematics Extension 1 (2 Viewers)

[ronash]

"I didnt have enough time for the test, lucky the supervisor gave us extra time for some reason "i felt sorry for you""

wat is this???.....charity hour??

OMFG, that was easily the hardest test in the last 10years of ext1. (yes espesh 06).
i will hunt down whoever set that test for the board of douches

 

[Kiwijnr]

You had to use the formula max velocity = na and max acceleration = n²a and from there it was easy

are these 4 unit formlas because i dont remeber them...
i know the a=-n²x ....but i didnt learn max acceleration formula???

 

[advanced sam]

please do

 

[midifile]

are these 4 unit formlas because i dont remeber them...
i know the a=-n²x ....but i didnt learn max acceleration formula???

No. We learnt them in 3 unit.

Either way, you can derive them yourself.

Say x = acosnt
v = -nasinnt
a = -n²acosnt

But the maximum/minimum that sinnt or cosnt can be is 1 or -1

So the max v occurs with sinnt = -1, therefore max v = na
And the max a occurs with cosnt = -1, therefore max a = n²a

 

[Kiwijnr]

ah, makes sense...i had just never come across this before...i think i needed to do more past test papers...

 

[u-borat]

i didnt use the formulas, i used the principle of SHM; which is that acceleration is maximum at the end points and zero at the origin, whereas velocity is maximum at origin and zero and the end points.

 

[Jaspal]

That was a really easy 3 unit paper i thought, so happy with it =]

 

[himiniji]

lol I got 56/84, which is 66% raw. What does everyone think that will scale to?

 

[badquinton304]

I hated that exam. Now I have to go through all this shit again next year.

 

[friction]

You had to use the formula max velocity = na and max acceleration = n²a and from there it was easy

I got that and still got it wrong

 

[badquinton304]

I got that and still got it wrong

Yeah I got everything but last minute I changed my corect answer to a wrong answer.

 

[adnan91]

do u think if i wrote all the formula's necessary and found the amplitude but forgot abt the period i wud get 2/3 marks?

 

[im-estelle]

maaaaaaaaaaan i hope i got at least 50%. i was equating my marks and i think i got about 40-45 out of 84. anyone know wat that scaled mark would go to? im hoping for a ~40/50 i'd be happy with that. pretty hard paper i reckon especially
q7 i didnt answer at all and also left out some chunks every now and again *sigh* 3u english tomorrw

 

[Undermyskin]

My crisis: in the inverse function question I misread the domain to x>=1
I did everything according to it. Will I lose marks? And if the following parts are to used the results of the previous parts, will I lose marks for them as well tho I'm doing them right with the new domain???

 

[im-estelle]

^u'll lose marks for the first part, but not the other two. im pretty sure. unlucky...and lucky, for u!!

 

[fahmy]

wow what was that ! lol im hopin for 50 plus outa 84........ wierd coz i got harder ones right but easy ones wrong such as polynomialls ! ... haha happy i got the shm one right.. since max v was 2.. i made (x dot) equal 2 sin .. somethin t... then i thought wat do i need to multiply (wen i diferentiate) to get 6 (max a) .. haha so i put 3 = n... then yeaa went from theree..
haha just had tp post coz im excited... dont ask .

 

[hayyleyy]

i love how the only people who thought it was easy were the 4 unit kids.
fags. why design an exam that half the people doing 3 unit cant do? seems pointless

this is true..... but isnt that the same for the 3u people doing the 2u paper??
from what i heard, most 3u ppl found the 2u paper easy and most 2u ppl hated it..

 

[Undermyskin]

^u'll lose marks for the first part, but not the other two. im pretty sure. unlucky...and lucky, for u!!

Are you sure just the first part? I mean, I did read somewhere about how, if I do right according to what I do wrong, my marks will still be counted for the consequent parts. I'm just not sure if all the markers will apply it (tho it's what the Board of Studies policy says).

 

[im-estelle]

^yes thats wat i said. ur marks will be counted for the consequent parts, that is; 2 and 3. whereas 1 will be wrong

 

[friction]

Its only if it doesnt make it easier.