General Thoughts: Mathematics Ext 1 (3 Viewers)

[DefiningTheta]

I'm waiting for someone to do the last question of Q14...

 

[hsc2012la]

Could someone upload all the answers for question 14?

 

[Raolan]

Did anyone not get the induction? It seemed really easy.

 

[chriss95]

5 is definitely D. Pair them up, to make 6! ways. Then x by 2! (=2) since C and L can be in any order. Also 11fii) multiples of 4.

For 14biii), I actually found no angles that worked simultaneously for both. Question problem, or what? Test out your values of theta and see if they satisfy both equations

 

[Rawf]

Idk about most of you..
but I found the test really hard -___- i couldnt do any of question 14 and i didn't get the probability right at ALL...
I got 1MC wrong, didn't know how to draw any of the graphs, got bits wrong here and there (ie. the newtons method & where that equation has a non-zero constant)
overal.. GG no more E4 for me, maybe not even an E3

 

[Nws m8]

Idk about most of you..
but I found the test really hard -___- i couldnt do any of question 14 and i didn't get the probability right at ALL...
I got 1MC wrong, didn't know how to draw any of the graphs, got bits wrong here and there (ie. the newtons method & where that equation has a non-zero constant)
overal.. GG no more E4 for me, maybe not even an E3

awww dw mate, just hope the cut off for E4 falls to around 40 XD

 

[nucgaek]

For 14biii), I actually found no angles that worked simultaneously for both. Question problem, or what? Test out your values of theta and see if they satisfy both equations

I got an answer which corresponded with others, it was somewhere around 70-80 degrees

 

[Nws m8]

what did youse do for Q.13) c) ii)

 

[Rawf]

awww dw mate, just hope the cut off for E4 falls to around 40 XD

Seeing everyone found it easy I don't think so
I only got 40/70 for trials lmao and I'm feeling worse now than how I felt during trials... so my mark might be even lower

 

[GoldyOrNugget]

Nws m8 which one was that?

 

[RishBonjour]

ATLEAST 20-30 people will get a 100

edit:
i think wayyy more than that actually.

Didn't get the 2 mark circle geo + think I lost 1 mark in projectile part iii (fml) (and I'm SHIT at 3u)

hopefully no sillies.

 

[Nws m8]

Nws m8 which one was that?

SHM

 

[Raolan]

what did youse do for Q.13) c) ii)

EDIT: Wrong question. I didn't get c(ii)

 

[Nws m8]

seeing everyone found it easy i don't think so
i only got 40/70 for trials lmao and i'm feeling worse now than how i felt during trials... So my mark might be even lower

kill chem !

 

[nucgaek]

Any chance of taking marks off for abbreviating "simple harmonic motion" to SHM?

EDIT: Wrong question. I didn't get c(ii)

You have to take 0.3 away from C(T) to find a new polynomial/equation, which you then use to estimate, so you get 22.something

 

[GoldyOrNugget]

t = 1.511s. Subbed it in, it works. I'm gonna kick myself if there's a smaller solution.

 

[Nws m8]

EDIT: Wrong question. I didn't get c(ii)

arggh can't you read ?! C, not D

 

[Rawf]

what did youse do for Q.13) c) ii)

you change the equation into Rcos(nt-whatever) = -5
then you work it out. I got 1.5 seconds or something like that (i probably solved it wrong knowing myself)

 

[Raolan]

Any chance of taking marks off for abbreviating "simple harmonic motion" to SHM?



You have to take 0.3 away from C(T) to find a new polynomial/equation, which you then use to estimate, so you get 22.something

Depends on the context. If it's obvious you're talking about simple harmonic motion I doubt it.
Given you're saying "therefore the particle is moving in SHM" I'm sure you'll be fine.

 

[Timske]

Any chance of taking marks off for abbreviating "simple harmonic motion" to SHM?



You have to take 0.3 away from C(T) to find a new polynomial/equation, which you then use to estimate, so you get 22.something

Yeah thats what i got 22.7