Specialist Maths (Exam 1): Discussion, Questions & Potential Solutions

[HamConspiracy]

Well, aren't you a smart cookie ;p I just went for the obvious route, especially considering the partial fractions we did in other questions. Any other tricksy questions? I realised just now that momentum is a vector quantity o.o

[Mattjbr2]

Can someone please post the mark allocations for each question?

[DinWell]

Do they care about where you put the point of inflection for the graph question?

[pha0015]

for the change in momentum question, the units specified were kg ms^-2, and so i changed my answer from using velocity to acceleration. How would this be marked, since there's a fundamental error in the question?

[mzhao]

for the change in momentum question, the units specified were kg ms^-2, and so i changed my answer from using velocity to acceleration. How would this be marked, since there's a fundamental error in the question?

Yes, it was a silly mistake by the VCAA. But ultimately, their cough up does not change the definition of "momentum". I predict they will mark the question as normal.

[HamConspiracy]

Yeah, I've heard of people complaining about that typo, unsure what they will do, but I think a change in momentum by definition is velocity, even if the units are wrong. I just straight up did the magnitude of the velocity instead of keeping it in cartesian form.

By the way, if you only considered the positive solution for the last question, you reckon it would be 3 or 4 out of 5? So getting a=1, b=0, c=-2.

[DinWell]

Yes, it was a silly mistake by the VCAA. Ultimately, their cough up does not change the definition of "momentum". I predict they will mark the question as normal.

I don't know if I did this, but if you put the unit as kgms^(-2) do you think they'll still give the marks?

[HamConspiracy]

Probably, if you showed the right numbers, they probably won't blame you for following their lead, but that just refers back to you presumably having to know the correct units for momentum and thus losing a mark. Depends if glass half full or empty from VCAA lol. Reckon I could get 2/3 for doing in terms of magnitude, instead in terms of i, j, k?

[DinWell]

Probably, if you showed the right numbers, they probably won't blame you for following their lead, but that just refers back to you presumably having to know the correct units for momentum and thus losing a mark. Depends if glass half full or empty from VCAA lol. Reckon I could get 2/3 for doing in terms of magnitude, instead in terms of i, j, k?

Yeah I think you'd lose 1 mark for going too far. It's similar to another past year question where the consensus was that you'd lose one mark if you went too far and found the magnitude.

[HamConspiracy]

I was more concerned about getting 1/3 lol, but yeah, I did show it in terms of i,j,k but changed it to magnitude so that seems good to me.

[fur2018]

Can someone post the mark allocations?

[jazzycab]

Mark Allocation

1a: 1 mark
1b: 3 marks
2a: 1 mark
2b: 3 marks
3: 4 marks
4: 4 marks
5: 4 marks
6: 3 marks
7: 3 marks
8a: 1 mark
8b: 3 marks
9a: 2 marks
9b: 1 mark
9c: 2 marks
10: 5 marks

[DinWell]

Well, aren't you a smart cookie ;p I just went for the obvious route, especially considering the partial fractions we did in other questions. Any other tricksy questions? I realised just now that momentum is a vector quantity o.o

Partial fractions in what other questions? I didn't use any partial fractions for the whole exam. Also, other than choosing between positive and negative in the final question, I don't think anything else was 'tricksy'.

[jpulvirenti]

is around a 28-30/40 a decent exam 1 mark

[DinWell]

is around a 28-30/40 a decent exam 1 mark

Your question is way too subjective, everyone has different definitions of decent.