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March 30, 2024, 02:12:25 am

Author Topic: Maths Extension 2 - Discussion, Questions, Potential Solutions  (Read 13020 times)

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Joseph41

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Maths Extension 2 - Discussion, Questions, Potential Solutions
« on: October 26, 2020, 09:02:25 am »
Good luck everybody! :)

When the exam has finished, use this thread to chat all things Maths Extension 2.

Oxford comma, Garamond, Avett Brothers, Orla Gartland enthusiast.

RuiAce

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #1 on: October 26, 2020, 06:12:53 pm »
Alright somehow this ended up being the first paper that landed in my hands, so here goes. Let me know of any mistakes along the way.

Uploading will be done by my beloved insanipi this year.

Multiple choice
Spoiler


Short answer - check back periodically!
Question 11

Question 12

Question 13

Question 14

Question 15

Question 16
Part A


Part B

« Last Edit: October 26, 2020, 10:18:03 pm by insanipi »

HeyyyIts2xq

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #2 on: October 26, 2020, 09:23:30 pm »
Sorry. Just something I've noticed. You made the Amplitude of motion for Q13a) root3. In the question, it says that the max displacement is 2root3 from the centre point of motion. Wouldn't that mean 2root3 is the amplitude?
HSC 2019: Mathematics Advanced [Accelerated] (93)

HSC 2020: English Advanced (84) | Mathematics Extension 2 (92) | Mathematics Extension 1 (95) | Chemistry (94) | Physics (86)

ATAR: 97.65

2021-2024: B. Applied Science (Diagnostic Radiography) @ The University of Sydney.

RuiAce

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #3 on: October 26, 2020, 09:35:03 pm »
Sorry. Just something I've noticed. You made the Amplitude of motion for Q13a) root3. In the question, it says that the max displacement is 2root3 from the centre point of motion. Wouldn't that mean 2root3 is the amplitude?
Caught that just now actually. Thanks for mentioning it! An amended solution will appear shortly.

mrsc

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #4 on: October 26, 2020, 09:38:39 pm »
Also shouldn't n equal 6 and not 2/3 for the SHM question?

RuiAce

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #5 on: October 26, 2020, 09:41:56 pm »
Also shouldn't n equal 6 and not 2/3 for the SHM question?
Should also be fixed in the latest version

pm2003

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #6 on: October 26, 2020, 11:10:33 pm »
do u know how many marks these questions were?

RuiAce

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #7 on: October 27, 2020, 12:05:35 am »
Overalls were

Q11: 16
Q12: 14
Q13: 15
Q14: 16
Q15: 13
Q16: 16

Was there any part you were interested in?

pm2003

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #8 on: October 27, 2020, 12:23:23 am »
Overalls were

Q11: 16
Q12: 14
Q13: 15
Q14: 16
Q15: 13
Q16: 16

Was there any part you were interested in?

13 and 15 please :) thank you so much

RuiAce

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #9 on: October 27, 2020, 01:24:27 am »
13 and 15 please :) thank you so much
Q13 parts:
a) 3
b) 3
c) 2,1
d) 1,3,2

Q15
a) 2,1,3
b) 2,1,3,1
« Last Edit: October 27, 2020, 01:38:55 am by RuiAce »

pm2003

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #10 on: October 27, 2020, 11:55:19 am »
thank you!  :)

Gli1

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #11 on: October 27, 2020, 12:57:34 pm »
What do you reckon the cut off for this year will be for 4u since everyone on Facebook is bluffing

HeyyyIts2xq

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #12 on: October 27, 2020, 02:48:58 pm »
Judges (i.e. extremely experienced teachers) will determine what a B6, B5 etc. students should show in terms of syllabus outcomes. These will then allow for the judge to decide what mark is a B6 B5 etc. These raw marks then get aligned to their respective positions.
i.e. 90-100 B6 etc.
This applies to E4 E3 etc. as well (i.e. extension subjects)

Now from my viewpoint, I see that the cutoff for E4 from past years have hanged approximately around 75ish. With that being said, my prediction is that it'll still be around this range.

HSC 2019: Mathematics Advanced [Accelerated] (93)

HSC 2020: English Advanced (84) | Mathematics Extension 2 (92) | Mathematics Extension 1 (95) | Chemistry (94) | Physics (86)

ATAR: 97.65

2021-2024: B. Applied Science (Diagnostic Radiography) @ The University of Sydney.

DarkWorld

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #13 on: October 27, 2020, 03:19:52 pm »
Welp. That's 10 marks lost from Q16 and 2 in multis.

RuiAce

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Re: Maths Extension 2 - Discussion, Questions, Potential Solutions
« Reply #14 on: October 27, 2020, 04:29:13 pm »
What do you reckon the cut off for this year will be for 4u since everyone on Facebook is bluffing
I think a lot of people underestimate the paper's difficulty. It leaned on the easier end of things, but I didn't really feel it was a blessing or anything.

I feel like worst case E4 cut-off would be around 81. I still think high end 70s should be enough. But who knows; won't find out until release of results day at earliest.
Welp. That's 10 marks lost from Q16 and 2 in multis.
Q16b felt like a question where you really had to show algebraic skill tbh.

Admittedly Q16a(i) sent my head spinning for a while before I finally understood what was going on.
« Last Edit: October 27, 2020, 04:33:05 pm by RuiAce »