General Thoughts: Mathematics Extension 1 (1 Viewer)

[Killerb47]

Yah! i got like 20.68s from integrating the dV/dt equation and subbing in 'r' -> which i think was a constant in the formula

R was not constant. It's rate of decrease was constant, but r was gradually decreasing. So the answer was 62 seconds.

 

[RealiseNothing]

Yeah im starting to think its wrong --> people are getting around 60s with a different method --> maybe it was the assumption that r was a constant was wrong =/

'r' is not a constant.

 

[lulwut]

Yeah im starting to think its wrong --> people are getting around 60s with a different method --> maybe it was the assumption that r was a constant was wrong =/

I found r when the volume was 10^-6 by subbing it into the V formula and rearranging, and then i subbed that value into the integration of dr/dt (once i had found the constant) and rearranged to get the time.

I'm not 100% that that's what i did, but looking at it right now, that's what i'm assuming i did...

 

[Locus]

'r' is not a constant.

Yeah i know now

 

[kimjuliana]

hi! What would mark would 52-55 raw get? And what would be the estimated e4cut off?

 

[cineti970128]

Pretty easy

 

[cineti970128]

hi! What would mark would 52-55 raw get? And what would be the estimated e4cut off?

90+

 

[jack12456]

Hi guys, for the further graphs question, i drew it in pencil. Apparently though when they scan it, it doesn't pick up on pencil, at least thats what my friend told me. Is this correct cos i'm really worried now. Should i send an email to bored of studies?
I've always drawn graphs in pencil :/

 

[Web Addict]

Hi guys, for the further graphs question, i drew it in pencil. Apparently though when they scan it, it doesn't pick up on pencil, at least thats what my friend told me. Is this correct cos i'm really worried now. Should i send an email to bored of studies?
I've always drawn graphs in pencil :/

Crap. I have the same issue.

 

[superSAIyan2]

the paper was pretty fun and new. it seemed harder than others.

think i got 1mcq wrong, and i cant remember if i wrote n or 2n on top of the sigma sign in 14b)iii). I'm quite sure i wrote n thoughÍ

 

[cineti970128]

How do you do Question 13aii? I integrated and somehow ended up with .

You integrate from Dr/dt to r= some constant t from i)

 

[kimjuliana]

Hi guys, for the further graphs question, i drew it in pencil. Apparently though when they scan it, it doesn't pick up on pencil, at least thats what my friend told me. Is this correct cos i'm really worried now. Should i send an email to bored of studies?
I've always drawn graphs in pencil :/

It's alright. I asked my teacher that this morning. He said it does scan, just as long as the drawing was dark enough. Plus I'm sure they will be able to see it.

 

[jack12456]

Are you going to contact the board of studies?

 

[jack12456]

Ahhh, awesome, was really worried. Thanks

 

[cineti970128]

How do you do Question 13aii? I integrated and somehow ended up with .

You find r when v= 10^(-6)

 

[obliviousninja]

I probs rawed 55-57/70

The projectile was fun. Paper was fairly easy, was expecting harder, or was it just my 4u mindset.

 

[Recondit]

MC: 9
Q11: 13-14
Q12: 13
Q13: 9-10
Q14: 8-10

52-56... Should've done better but I guess was not too bad

 

[lulwut]

Yeah i know now

I just did it again and got 62.04 seconds ;_; 0/2 dammit LOL 1/2 if we're lucky

 

[AsianFrustratio]

Damn, easy exam. But I got a bunch of sillies pointed out to me :L

What would a 65~ raw get?

 

[obliviousninja]

Why are people crying about the binomial, first two parts were do-able. Everyone is liking the stupid facebook meme, which says it wasn't.