• Best of luck to the class of 2024 for their HSC exams. You got this!
    Let us know your thoughts on the HSC exams here
  • YOU can help the next generation of students in the community!
    Share your trial papers and notes on our Notes & Resources page
MedVision ad

General Thoughts: Mathematics Extension 1 (2 Viewers)

andrew29223

New Member
Joined
Jul 25, 2012
Messages
23
Gender
Male
HSC
2013
What question did everyone find was the hardest?
Mighty Spiral! Uh the last bit of the binomial question in 14 was tricky for me but I'm sure many found it fine, i know a lot of my class mates couldnt get the very last question. I'm sure a lot of people (looking at the circle geo thread) assumed a straight line in their proof and will lose marks
 

Hotisgood5

New Member
Joined
Jul 25, 2012
Messages
18
Gender
Male
HSC
2013
I used the fact that when two circles touches, the line through their centres passes through their point of contact. With that, all i have to proof is that the newly drawn line and QP intersects such that vertically opposite angles are equal.
 

lulwut

New Member
Joined
Aug 7, 2013
Messages
22
Gender
Male
HSC
2013
I used the fact that when two circles touches, the line through their centres passes through their point of contact. With that, all i have to proof is that the newly drawn line and QP intersects such that vertically opposite angles are equal.
You can have vertically opposite angles be equal, but not necessarily drawn from the same lines right? Like just imagining the two triangles being skewed either way, and p is no longer colinear. I think you had to prove it using the angles to the tangent. I had no idea for this question during the exam LOL 0/3 for me ;_;
 

blinx96

Member
Joined
Mar 6, 2012
Messages
103
Location
Blacktown
Gender
Male
HSC
2013
LOL i reckon i got around 38/70 (my 11th unit so idgaf)
But... anyone care to guess what this would align to as my exam mark :)
 

lulwut

New Member
Joined
Aug 7, 2013
Messages
22
Gender
Male
HSC
2013
did anyone get around 20 s for the water droplet evaporating?
YES i got like 20.6.... seconds ish. cant remember exactly but around there. It felt a little funny because my expression for r was kinda weird though
 

Locus

Member
Joined
Jul 30, 2013
Messages
77
Gender
Male
HSC
2013
YES i got like 20.6.... seconds ish. cant remember exactly but around there. It felt a little funny because my expression for r was kinda weird though
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
 

Locus

Member
Joined
Jul 30, 2013
Messages
77
Gender
Male
HSC
2013
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
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 =/
 

Users Who Are Viewing This Thread (Users: 0, Guests: 2)

Top