OCR C3 (not MEI) Official Thread - Tuesday 21st June 2016

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    Guys for Question 4, I can't seem to find B in the second equation it's given. Can anyone help me with this please? Many thanks.

    The second equation that is given is: sinBsec^2B = 27cosBcosec^2B
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    (Original post by shazaad39)
    Guys for Question 4, I can't seem to find B in the second equation it's given. Can anyone help me with this please? Many thanks.

    The second equation that is given is: sinBsec^2B = 27cosBcosec^2B
    sinB(1/cosB)^2 = 27cosB(1/sinB)^2
    rearranging (sinB/cosB)^3 = 27 so tanB=3
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    (Original post by Baileyprice1234)
    I did exactly that method but didn't get those answers! Must have made a stupid mistake somewhere along, so annoying! Thank you though!
    Yh It was a really easy to make a mistake on that question I had to do it 3 times before getting the correct solution.
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    (Original post by Vikingninja)
    What did people get for the number next to t in question 3 so then they could find the mass?
    1/5ln(4/5) or 4/5ln(1/5) can't quite remember but it was deffo one of the two.
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    (Original post by AsphodelMist)
    1/5ln(4/5) or 4/5ln(1/5) can't quite remember but it was deffo one of the two.
    I remember 4/5 in it though I showed it as a decimal in workings.
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    I hope everyone wrote .dx on their integrations, OCR have started being picky on people being slack with notation. I'm always guilty of it :'(
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    It was 1/5ln(4/5) as you start with 160=200e^5k
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    (Original post by Vstudent13)
    It was 1/5ln(4/5) as you start with 160=200e^5k
    Don't know what I did but got it wrong, but if I had k wrong in the first part do you reckon I would've for error carried forward marks in part (ii)?
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    I'm sure as long as sure method is correct you won't lose all the marks
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    (Original post by micycle)
    And no rates of change either. That's time spent learning 1/4 of the syllabus wasted.
    I completely agree! It was utterly ridiculous. The grade boundaries should be lowered for that reason alone. I think it consisted mostly of tricky trig and calculus questions, and the weightings were somewhat strange as well. Fingers crossed for low grade boundaries!
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    (Original post by jeevanr21)
    I completely agree! It was utterly ridiculous. The grade boundaries should be lowered for that reason alone. I think it consisted mostly of tricky trig and calculus questions, and the weightings were somewhat strange as well. Fingers crossed for low grade boundaries!
    I certainly hope so! Much harder than past papers I've done. Average of A was 54 so lets hope this is 1 or 2 less.
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    Is there a community MS?
    • Thread Starter
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    (Original post by GeorgeMath)
    Is there a community MS?
    Yeah if you go back a few pages you should find the Google doc
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    (Original post by sophiewei)
    I certainly hope so! Much harder than past papers I've done. Average of A was 54 so lets hope this is 1 or 2 less.
    I hope so too! I cried after the paper, I have to say it seemed to be a completely different format to the past papers. I messed up one or two which I know I could've got, but mostly it was unfamiliar questions that caught me out. I'm really hoping to scrape an A* somehow!
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    Does anyone have the C4 2015 paper
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    (Original post by msulli)
    Does anyone have the C4 2015 paper
    Question Paper: https://drive.google.com/open?id=0B7...HNUWGVIeG9fbnM

    Mark Scheme: https://drive.google.com/open?id=0B7...G5mcTdnLVhZSmM
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    Thanks :thumbsup:
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    (Original post by Dom1997)
    From the unofficial mark scheme I think I got anywhere between 69-59 marks (Being as harsh as possible and taking all answers I've forgotten as 0 marks for the lower bound) What range of Ums scores do you think I've gotten?
    Who knows?! Past averages have been 54.5 for 80 UMS and 60.9 for 90 UMS.
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    I know it's a bit late now but would I be likely to get the mark for the range of G if I put between minus infinity and infinity? For some reason I forgot that "all real values" is a thing :dontknow: I doubt it, but it's worth a shot
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    Guys I know it was a few days ago but you know for question 6, if I used simultaneous equations and solved them and they worked for my equations but weren't the correct answer how many marks would I get out of the available 8
 
 
 
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