Mr M's OCR (not OCR MEI) Core 2 Answers 18th January 2013 Watch

alexj1790
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#41
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Ok cool, was just wondering as I had the s2 exam today
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natashaei123
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How am i able to find the paper questions for both core1 and core2 please?
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BawanHama
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(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers January 2013



1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)



2. (i) Show ... (2 marks)

(ii) Show ... (4 marks)



3. (i) k=\frac{3}{2} (2 marks)

(ii) y=x^3-\frac{3x^2}{4}+2 (5 marks)



4. (i) 32+80x+80x^2+40x^3+10x^4+x^5 (4 marks)

(ii) 1560 (3 marks)



5. (i) Show ... (3 marks)

(ii) x = 120 degs, 240 degs, 48.2 degs, 312 degs (4 marks)



6. (i) x=\frac{15}{2} (3 marks)

(ii) (a) Verify and S_{\infty}=64 (4 marks)

(b) x=-\frac{2}{3} (4 marks)



7. (i) Show ... (2 marks)

(ii) 15.2 cm (2 marks)

(iii) 9.76 cm^2 (5 marks)



8. (i) Translation by 3 units in the positive x direction (2 marks)

(ii) a = 8 (1 mark)

(iii) b = 6.48 (2 marks)

(iv) c=\frac{16}{5} (4 marks)



9. (i) Show ... (6 marks)

(ii) a=\frac{1+\sqrt{7}}{3} (6 marks)
Hi, thanks for the answers, just one Q., wouldn't the last one be (1+or-rt7) /3 ? or is the (1-rt7)/3 not included? Also how many marks would you loose if you put both? Thanks
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cleverslacker
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#44
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Muchos Gracias Mr. M
Major improvement to June I think.
Hope you're covering C3 next week!
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BawanHama
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(Original post by Lstigant)
Why is 6ii 64?? I got r=3/4 so 8/(1-3/4)=32
'a' was 2x, when x=8, 2x=16, hence 16/(1-3/4) is 64
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olivers16
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If I didn't round my answers (especially for the first 2 questions) and it doesn't say anything on the question like 3 sig fig, will I lose any marks? Thanks.
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Mr M
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#47
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(Original post by BawanHama)
Hi, thanks for the answers, just one Q., wouldn't the last one be (1+or-rt7) /3 ? or is the (1-rt7)/3 not included? Also how many marks would you loose if you put both? Thanks
The question says it has to be positive. Drop 1 mark.
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Mr M
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(Original post by cleverslacker)
Muchos Gracias Mr. M
Major improvement to June I think.
Hope you're covering C3 next week!
Yes.
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Mr M
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(Original post by olivers16)
If I didn't round my answers (especially for the first 2 questions) and it doesn't say anything on the question like 3 sig fig, will I lose any marks? Thanks.
The exam papers for all OCR A Level maths exams say on the front to round all non-exact answers to 3 s.f.

If you gave more accurate answers than this, you will not be penalised.
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AdamSutton
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What if I did 1/3 + 1/3root7? how many marks would I lose? t
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers January 2013



1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)



2. (i) Show ... (2 marks)

(ii) Show ... (4 marks)



3. (i) k=\frac{3}{2} (2 marks)

(ii) y=x^3-\frac{3x^2}{4}+2 (5 marks)



4. (i) 32+80x+80x^2+40x^3+10x^4+x^5 (4 marks)

(ii) 1560 (3 marks)



5. (i) Show ... (3 marks)

(ii) x = 120 degs, 240 degs, 48.2 degs, 312 degs (4 marks)



6. (i) x=\frac{15}{2} (3 marks)

(ii) (a) Verify and S_{\infty}=64 (4 marks)

(b) x=-\frac{2}{3} (4 marks)



7. (i) Show ... (2 marks)

(ii) 15.2 cm (2 marks)

(iii) 9.76 cm^2 (5 marks)



8. (i) Translation by 3 units in the positive x direction (2 marks)

(ii) a = 8 (1 mark)

(iii) b = 6.48 (2 marks)

(iv) c=\frac{16}{5} (4 marks)



9. (i) Show ... (6 marks)

(ii) a=\frac{1+\sqrt{7}}{3} (6 marks)
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Mr M
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(Original post by AdamSutton)
What if I did 1/3 + 1/3root7? how many marks would I lose? t
You wouldn't lose any as that is the right answer (unless you have put that root 7 on the bottom of the second fraction)!
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PhysMathEcon
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#52
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How many marks would you guess this is worth as obviously it's slightly wrong

Y+4= log2(c) y= log2(c-3)
Log2(c) - log2(8)= log2(c-3)
c/8=c-3
7c=24
c= 3.24

Thanks

(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers January 2013



1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)



2. (i) Show ... (2 marks)

(ii) Show ... (4 marks)



3. (i) k=\frac{3}{2} (2 marks)

(ii) y=x^3-\frac{3x^2}{4}+2 (5 marks)



4. (i) 32+80x+80x^2+40x^3+10x^4+x^5 (4 marks)

(ii) 1560 (3 marks)



5. (i) Show ... (3 marks)

(ii) x = 120 degs, 240 degs, 48.2 degs, 312 degs (4 marks)



6. (i) x=\frac{15}{2} (3 marks)

(ii) (a) Verify and S_{\infty}=64 (4 marks)

(b) x=-\frac{2}{3} (4 marks)



7. (i) Show ... (2 marks)

(ii) 15.2 cm (2 marks)

(iii) 9.76 cm^2 (5 marks)



8. (i) Translation by 3 units in the positive x direction (2 marks)

(ii) a = 8 (1 mark)

(iii) b = 6.48 (2 marks)

(iv) c=\frac{16}{5} (4 marks)



9. (i) Show ... (6 marks)

(ii) a=\frac{1+\sqrt{7}}{3} (6 marks)
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olivers16
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(Original post by Mr M)
The exam papers for all OCR A Level maths exams say on the front to round all non-exact answers to 3 s.f.

If you gave more accurate answers than this, you will not be penalised.
Great thank you
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stirkee
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(Original post by PhysMathEcon)
How many marks would you guess this is worth as obviously it's slightly wrong

Y+4= log2(c) y= log2(c-3)
Log2(c) - log2(8)= log2(c-3)
c/8=c-3
7c=24
c= 3.24

Thanks
what on earth did you do there :eek:

1 maybe, dunno
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Mr M
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(Original post by PhysMathEcon)
How many marks would you guess this is worth as obviously it's slightly wrong

Y+4= log2(c) y= log2(c-3)
Log2(c) - log2(8)= log2(c-3)
c/8=c-3
7c=24
c= 3.24

Thanks
That's really wrong. Probably worth 1 mark.
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JASApplications
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on 7iii) I really hadn't got a clue what to do so ended up plugging numbers in the two area formulas (1/2absinC and 1/2r^2theta)

I worked out the area of the triangle and multiplied by 2 to get about 25.2. I worked out the area of the sector and multiplied by 2 to get about 53.0. I then subtracted the area of the triangle from the area of the sector and ended up with around 27cm^2!

Doesn't really make sense but I had 5 mins left at the end of the exam so had to try something!

How many method marks do you thing I would get? 2/5? 3/5 at a push?
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PhysMathEcon
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(Original post by Mr M)
That's really wrong. Probably worth 1 mark.
Ok Thankyou, where else is wrong as the only mistake I can see is that I wrote 4 to be log2(8) rather than log2(16), and then ofcourse the answer as a result, correcting 8 to 16 using the same method gives the correct answer.
I'm not arguing your reply, you definitely know best, I'm just curious and ofcourse would llike to believe there is a chance of 2
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[email protected]
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(Original post by Mr M)
That's really wrong. Probably worth 1 mark.
I think that's very nearly right, surely he would get method marks?
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CocoTango
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YAY! These threads make me feel so much better - before I thought I'd got a C but now I reckon I've got an A - thank you so much!

But for the penultimate question ... What would the algebraic integral be ( before you put in the a values)
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saberahmed786
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#60
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I'm re-doing the paper exactly as I did in the exam to see where I might have dropped/picked up marks
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