General Thoughts: Mathematics Extension 1 (4 Viewers)

[Wentworth]

Re: Wow, fuck that

and wtf was up with question 7, related fucking rates LOL, usually projectile isn't it? I think 2011 is the year BOS decided to experiment; changing the 4u test structure, AOS is all on place, 3unit has related rates as question 7 ... shit I bet physics next week asks about the scientists contribution to rocketry.

 

[evanstroeve]

For SHM:

Amplitude = 2
So doesn't x reach 2, come back to 0 (2), travel to -2 (2) and back to 0?
ie distance = 4(2)
= 8 ?

 

[UnrealAnchovies]

Re: Wow, fuck that

part (ii).

I thought it was just dV/dt = dl/dt x dV/dl

i usually use implicit differentiation for rates questions, so when i saw it wasn't working i think i panicked and forgot you could also use the chain rule lol

how great is retrospect! (it isn't)

 

[eyeswideshut]

Re: Wow, fuck that

I was getting a complex number so skipped it haha

me too! how is that possible

 

[Riku123123]

Re: Wow, fuck that

part (ii).

I thought it was just dV/dt = dl/dt x dV/dl

but couldnt work out dV/dl

 

[Implying]

Re: Wow, fuck that

shit I bet physics next week asks about the scientists contribution to rocketry.

that would be a pain in the ass

i'm just hoping that for SOR1 they give another integrated question otherwise i'm fucked
shit, i should probably study for that now aye

 

[eyeswideshut]

Re: Wow, fuck that

okay I'm a 4u student and I found this really hard. What was the restriction on the y coordinate for 3biv?
and how did people do ii) and iii) of the circle geo? I found that harder than the 4u circle geo o.o
hoping for 60/84

 

[damo_g]

It was negative value like you meant to subtract 1 hour 14 minutes from 10am..I added it cause I thought negative was not right...sigh

Dammit i'm so angry with that. I just rewrote the equation with the numbers i used and got the same value. Used the negative time and ended up with 8:46. How many marks do you think i will get for getting the correct time, but not working out the time of day?

 

[Wentworth]

Re: Wow, fuck that

okay I'm a 4u student and I found this really hard. What was the restriction on the y coordinate for 3biv?
and how did people do ii) and iii) of the circle geo? I found that harder than the 4u circle geo o.o
hoping for 60/84

I think it was y<1/4 GOD PLEASE LET IT BE THAT!!

 

[Nympha]

Re: Wow, fuck that

but couldnt work out dV/dl

Didn't you just have to differentiate the volume with respect to l? Ie. Take h as a constant.

And overall I thought the exam was pretty doable. There was nothing obscenely hard, it just required more time to nut stuff out. Fingers crossed for 75+/84

 

[_pizza]

Re: Wow, fuck that

but couldnt work out dV/dl

dV/dl = d/dx(pi/3(h^3 - l^3) = pi/3(-3l^2) = -3pi l, that's how I did it anyway, its prob wrong I had 5 mins to go then so was rushing.

 

[HyperComplexxx]

Re: Wow, fuck that

I think it was y<1/4 GOD PLEASE LET IT BE THAT!!

i got that as well

 

[evanstroeve]

Re: Wow, fuck that

Didn't you just have to differentiate the volume with respect to l? Ie. Take h as a constant.

That's what I did, h is clearly a constant, l is variable.

 

[muzeikchun852]

Re: Wow, fuck that

okay I'm a 4u student and I found this really hard. What was the restriction on the y coordinate for 3biv?

i think it's y< 0 but im not sure.

 

[silence--]

Re: Wow, fuck that

the test was so fucking long! and weird...

does anyone else think the style of questions are just so different this year?

like for everything. 4u, english, etc.

i'd be lucky to get ~70 for this one (was getting high 70s on past hscs)

ugh.
HSC :/

also i got:
8:48am or something around that for the time question
y < 1/4 for the restriction on y for the locus
can't remember anything else

 

[damo_g]

Re: Wow, fuck that

dV/dl = d/dx(pi/3(h^3 - l^3) = pi/3(-3l^2) = -3pi l, that's how I did it anyway, its prob wrong I had 5 mins to go then so was rushing.

That's what i got, was rushing like crazy too. Had to do what i could see straight away of questions 7 so i could go back and fix up the math induction that i fuked up (got it out, just made a stupid mistake when factorising earlier).

 

[friend177]

Dammit i'm so angry with that. I just rewrote the equation with the numbers i used and got the same value. Used the negative time and ended up with 8:46. How many marks do you think i will get for getting the correct time, but not working out the time of day?

1/3 actually normally 2 for working out 1 for final answer

 

[_pizza]

Re: Wow, fuck that

i got that as well

Me too, since for tangents to cross R had to be below the curve

 

[CombustionManX]

What was the total distance the particle travelled? 8?

I didn't even know how to do that, I blanked out, Fuck

 

[aphorae]

Re: Wow, fuck that

Fml I didn't study SMH a single bit..I thought projectile motion will be more than SMH.

oh man the opposite for me, i was so lucky.

totally gave up on projectiles in the last few days, prepared to screw it, and did 2hrs of shm this morning hahahha