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

Announcements

Report

#43

(Original post by

1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)

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

(ii) Show ... (4 marks)

3. (i) (2 marks)

(ii) (5 marks)

4. (i) (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) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (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) (4 marks)

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

(ii) (6 marks)

**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) (2 marks)

(ii) (5 marks)

4. (i) (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) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (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) (4 marks)

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

(ii) (6 marks)

0

reply

Report

#44

Muchos Gracias Mr. M

Major improvement to June I think.

Hope you're covering C3 next week!

Major improvement to June I think.

Hope you're covering C3 next week!

0

reply

Report

#45

(Original post by

Why is 6ii 64?? I got r=3/4 so 8/(1-3/4)=32

**Lstigant**)Why is 6ii 64?? I got r=3/4 so 8/(1-3/4)=32

0

reply

Report

#46

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.

0

reply

(Original post by

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

**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

0

reply

(Original post by

Muchos Gracias Mr. M

Major improvement to June I think.

Hope you're covering C3 next week!

**cleverslacker**)Muchos Gracias Mr. M

Major improvement to June I think.

Hope you're covering C3 next week!

0

reply

(Original post by

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.

**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.

If you gave more accurate answers than this, you will not be penalised.

0

reply

Report

#50

What if I did 1/3 + 1/3root7? how many marks would I lose? t
(Original post by

1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)

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

(ii) Show ... (4 marks)

3. (i) (2 marks)

(ii) (5 marks)

4. (i) (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) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (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) (4 marks)

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

(ii) (6 marks)

**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) (2 marks)

(ii) (5 marks)

4. (i) (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) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (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) (4 marks)

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

(ii) (6 marks)

2

reply

(Original post by

What if I did 1/3 + 1/3root7? how many marks would I lose? t

**AdamSutton**)What if I did 1/3 + 1/3root7? how many marks would I lose? t

0

reply

Report

#52

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

1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)

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

(ii) Show ... (4 marks)

3. (i) (2 marks)

(ii) (5 marks)

4. (i) (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) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (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) (4 marks)

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

(ii) (6 marks)

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

**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) (2 marks)

(ii) (5 marks)

4. (i) (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) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (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) (4 marks)

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

(ii) (6 marks)

0

reply

Report

#53

(Original post by

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.

**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.

0

reply

Report

#54

(Original post by

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

**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

1 maybe, dunno

0

reply

**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

0

reply

Report

#56

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?

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?

0

reply

Report

#57

(Original post by

That's really wrong. Probably worth 1 mark.

**Mr M**)That's really wrong. Probably worth 1 mark.

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

0

reply

Report

#58

(Original post by

That's really wrong. Probably worth 1 mark.

**Mr M**)That's really wrong. Probably worth 1 mark.

1

reply

Report

#59

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)

But for the penultimate question ... What would the algebraic integral be ( before you put in the a values)

0

reply

Report

#60

I'm re-doing the paper exactly as I did in the exam to see where I might have dropped/picked up marks

0

reply

X

### Quick Reply

Back

to top

to top