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OCR (not OCR MEI) Core 4 Answers January 2011

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Original post by BMTronMania
Any clue what 69/72 would be?


A very respectable mark?
Original post by ElMoro
I can't remember. I guess I'll lose all three marks? :s-smilie:


You should have had:

3(x−8)23=48−8t3(x-8)^{\frac{2}{3}}=48-8t as the solution of the diff equation.

You know dxdt−4(x−8)13\frac{dx}{dt}-4(x-8)^{\frac{1}{3}}

Find when the flow stops (when x = 8) and sub x = 8 into the first equation.
*in UMS :P ???
Original post by BMTronMania
*in UMS :P ???


I honestly don't know. Stop stressing - you did good.
Original post by Mr M
I honestly don't know. Stop stressing - you did good.


ok. do you do S2?
Original post by Mr M
Yes, I will have the paper for that one (if the exams officer doesn't go home early)!


I'm glad you're doing FP1 since I'm the only one in my school doing it so I wouldn't have anyone to compare answers with. Also do you realise C3 is on the same afternoon? :eek:
Original post by BMTronMania
ok. do you do S2?


No I don't - I really can't help with that one at all.
Original post by Freerider101
I'm glad you're doing FP1 since I'm the only one in my school doing it so I wouldn't have anyone to compare answers with. Also do you realise C3 is on the same afternoon? :eek:


We don't have anyone taking C3 in Jan either. If someone gets me a paper, again I will do it. We have Ofsted next Wednesday (not a full inspection) so I might not be able to post answers until the evening.
Original post by Mr M
Yes, I will have the paper for that one (if the exams officer doesn't go home early)!

Brilliant, thanks!

Original post by BMTronMania
Any clue what 69/72 would be?

96% :P haha. I would say that's easily A*, but nobody here knows what the exam board will decide.
Original post by snowboardinsteve
Brilliant, thanks!


96% :P haha. I would say that's easily A*, but nobody here knows what the exam board will decide.


But i mean...is it 100UMS?
Original post by snowboardinsteve


nobody here knows what the exam board will decide.


Hope they aren't evil and say like 67/72 for an A 0.o now that would be evil lol :devil:
Original post by BMTronMania
ok. do you do S2?

Are you taking S2 in January or June this year? I'm doing it in June so if its the same for you maybe we can sort out some answers :smile:
Original post by BMTronMania
But i mean...is it 100UMS?



Original post by mathsclown
Hope they aren't evil and say like 67/72 for an A 0.o now that would be evil lol :devil:


Haha I hope its not that high! :P
Please correct me if I' wrong, but I think the raw marks are scaled to be out of 100, and then adjusted so that the percentages of people getting each grade are roughly similar every year. :confused:
Reply 33
Avatar for singhyd
singhyd
Do you think i have any chance of getting 92 ums or above with 63-66/72
(edited 13 years ago)
Original post by snowboardinsteve
Are you taking S2 in January or June this year? I'm doing it in June so if its the same for you maybe we can sort out some answers :smile:


January :smile: u?
(edited 13 years ago)
Reply 35
Avatar for ElMoro
ElMoro
18
Original post by Mr M
You should have had:

3(x−8)23=48−8t3(x-8)^{\frac{2}{3}}=48-8t as the solution of the diff equation.

You know dxdt−4(x−8)13\frac{dx}{dt}-4(x-8)^{\frac{1}{3}}

Find when the flow stops (when x = 8) and sub x = 8 into the first equation.


Yeah, I got it completely wrong :P
But hopefully, getting an A* isn't out of reach.
Original post by snowboardinsteve
Haha I hope its not that high! :P
Please correct me if I' wrong, but I think the raw marks are scaled to be out of 100, and then adjusted so that the percentages of people getting each grade are roughly similar every year. :confused:


All I was told by my teachers was ehm if everyone does well then it'll be a little bit over 80% raw for 80ums and viCe versa, but not sure, UMS is just as confusing as core 4 maths lol
Original post by BMTronMania
January :smile: u?


June for me. But good luck!
Original post by Mr M
You can thank snowboardinsteve who sent me a paper to do ....



1. (i) 1−x2−x281-\frac{x}{2}-\frac{x^2}{8} (3 marks)

(ii) 1−y+3y221 - y + \frac{3y^2}{2} (3 marks)


2. (i) −2x−2+3(x−2)2- \frac{2}{x-2} + \frac{3}{(x-2)^2} (3 marks)

(ii) 12+2ln⁡(23)\frac{1}{2} + 2 \ln (\frac{2}{3}) (4 marks)


3. (i) Show ... (4 marks)

(ii) 2sec⁡x2+k\frac{\sqrt{2} \sec x}{2} + k (4 marks)


4. (i) dydx=2t\frac{dy}{dx}=\frac{2}{t} (2 marks)

(ii) y=−2x+52y=-2x+52 (3 marks)

(iii) y2=16(x−2)y^2 = 16(x-2) (2 marks)


5. (i) Show ... and 43\frac{4}{3} (5 marks)

(ii) (a) 5−x5-x (1 mark)

(b) Show ... (3 marks)


6. (i) 24.0 degrees (4 marks)

(ii) Show ... (4 marks)

(iii) a = 6 (2 marks)


7. Show ... (7 marks)


8. (i) Show ... (5 marks)

(ii) (6, 3) and (-6, -3) (3 marks)


9. (i) 218\frac{21}{8} mins (7 marks)

(ii) 6 mins (3 marks)


Hi Mr M, could you please outline how to do Q7, and how you think the 7marks would be allocated in this question? Thank you!
Original post by purplestarfish
Hi Mr M, could you please outline how to do Q7, and how you think the 7marks would be allocated in this question? Thank you!


You need to do two applications of IBP.

3 marks for first application.

2 marks for second application.

2 marks for correctly evaluating limits.

probably!

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