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C4 (Not MEI) - Thursday June 21 2012, PM

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Original post by Voglie
Woooo, We didn't do C4 in my school and I didn't have time so I had to learn it all from scratch yesterday LOL! This went as well as it could have considering the time I spent preparing :smile:.

I reckon I ended up getting like 58/72 at the minimum, hopefully that should be an A! :smile:

I HOPE EVERYONE DID WELL!!! Any predictions for grade boundaries?


You learnt everything yesterday lmao lier
Do they still check for constants on c4?


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I'm positive I lost about 5 marks. Will 65/72 be enough to get 96% UMS? Considering that people found this paper hard.
Reply 583
Original post by Mr M (jr)
Q2 drop 3 marks (or maybe 2 depending on what else you've written)
Q5 drop 3 marks
Q8 drop 1 or 2 marks
Q10 drop 1 mark


thank you
Original post by lamalas600
You learnt everything yesterday lmao lier


what a load of rubbish! I don't think its possible to learn c1 in one day :L
Original post by Sweetcorn_1
x/x+2

x+2-2/x+2

1-2/x+2

then integrate that, I still got it wrong because I left it as e^2y though :biggrin:


Or, if you didn't use this clever little trick (which would be more familiar to those who have studied FP2), you could make a substitution of u = x+2.
By the way when you had e^2y=tanx if you squared both sides it woulda been easy

e^4y=sec^2x

Integrates comfortable into tanx=1/4 e^4y

But I didn't do that because I'm bad at maths :frown:
Reply 587
Original post by joenye
I'm positive I lost about 5 marks. Will 65/72 be enough to get 96% UMS? Considering that people found this paper hard.


I reckon around 54 for an A, 61 for A*. Got a good shot with 65, congrats!
Reply 588
Grade boundary predictions for an A?
Reply 589
Original post by Sweetcorn_1
I'll be in Josephine Butler, so the odds of us being in the same college are low.

NOTHING IS HAPPY TODAY.


your worrying too much relax xD :wink: you probably did better than you think. what were ur other uni options and what do you want to study?
Original post by Mr M (jr)
Or, if you didn't use this clever little trick (which would be more familiar to those who have studied FP2), you could make a substitution of u = x+2.


I don't do further maths, I learnt this in C4.
I reckon the grade boundary for an A will be 58 (raw)- I thought it was a nice paper, but everyone else in my class thought it was harder than all the other past papers (I thought June 2011 was the hardest- because of the last question).
Original post by Matthew692692
Do they still check for constants on c4?


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Sometimes; less frequently than on C2, but more frequently than on FP2.
Original post by PhysicsMan
You don't use L1- you use the position vector of A multiplied by a variable ( I used the Greek letter μ).


damm i knew it ... o well thanks. in that case i think i got 54/72 . thats ok i suppose :smile:
Reply 594
Original post by joenye
I'm positive I lost about 5 marks. Will 65/72 be enough to get 96% UMS? Considering that people found this paper hard.


I was asking myself whether losing 10 marks (so 62/72) would scrape me 81 UMS, am I being silly here?
Original post by a10
your worrying too much relax xD :wink: you probably did better than you think. what were ur other uni options and what do you want to study?


Out of:

St Andrews
Edinburgh
Warwick
UCL
Durham

I chose UCL and Durham, for CompSci. And I know for a fact I've lost a brickton of marks so the only thing which will save me are the boundaries. I did bad in M1 as well.
Reply 596
Original post by lamalas600
You learnt everything yesterday lmao lier


No I swear to god. I am telling the truth..
Can someone tell me how many marks I've lost?

2) got to xln(x+2) - integral of x/(x+2) but no further
3ii) I got 1/4>x>-1/4
91) Instead of -1, 2 and -3 I got 3, -2 and 1 (But my 9ii was right)
10iii) I got -3:2
Reply 598
hopefully got about 55 ish. :'

I couldn't do the substitution one... arrghh. But If I got the limits correct, and differentiated a the values, I hope I get 2-3 out of 7. :redface:
I didn't know how to integrate ln(x+4)... so that sucked. I didn't know what u would be and what dv/dx would be. :frown:
Thought it was a relatively normal C4 paper, despite the fact that I failed to see ln(x+2) = 1 x ln(x+2)..........

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