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# AQA Core 4 - Monday 10th June 2013 (AM) - Official Thread watch

1. (Original post by MSI_10)
Am I the only one who ran out of time? Damn area triangle vector hybrid q..

Who got the constant as 240 for last q? Coordinates of d were weird like all over 17?

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I got 240 as my constant. An a finally answer of 6.3m ish 630cm but im not to sure on that i couldn't tell if that was a stupid answer!
2. (Original post by MSI_10)
Am I the only one who ran out of time? Damn area triangle vector hybrid q..

Who got the constant as 240 for last q? Coordinates of d were weird like all over 17?

Posted from TSR Mobile
WRONG
3. MU was -1
4. Somebody please explain to me how to solve part d in the Vectors question.. waste of 4 marks.
5. I got 4 as my last answer but I think I forgot to make it cm so should be 400cm but not sure if thats right :/ Did everyone use integration by parts for that one???
6. (Original post by georgeherby)
I got 240 as my constant. An a finally answer of 6.3m ish 630cm but im not to sure on that i couldn't tell if that was a stupid answer!
I got 6.3!!!

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7. (Original post by MSI_10)
Am I the only one who ran out of time? Damn area triangle vector hybrid q..

Who got the constant as 240 for last q? Coordinates of d were weird like all over 17?

Posted from TSR Mobile
Got a constant of 256 and an answer of like 30.64m, no idea whether thats right though just slapped it into my calculator.
8. (Original post by Dhaden)
Got a constant of 256 and an answer of like 30.64m, no idea whether thats right though just slapped it into my calculator.
i think you had 256 but you had to subtract 16 as the sin when to zero but the cos was 16 so C=240
9. Got some weird numbers for the coordinates of D, all over 17. Can't remember what I got for the last bit.

For the writing a differential equation what did everyone get? I put something like

1.3cos(30t)

A complete guess

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10. (Original post by Dhaden)
Got a constant of 256 and an answer of like 30.64m, no idea whether thats right though just slapped it into my calculator.
I think I got that too

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11. (Original post by dj_rubix)
WRONG
lol
12. That was not at all fun.

I got full UMS on the 4 most recent past papers, and seeing as the standard grades of papers should be equal, I hope the grade boundaries are low. Maybe 63-65 for full UMS? 63 was full UMS for Jan 2013 remember.

Vectors: anyone else get D (5, 1, 2)? or something similar

I couldn't find the coordinates of E though. I got some massive quadratic involving mu, where mu was like 2.3821 and -2.5832. I kind of gave up on that one. Hope I get some method marks though for working out the area of the smaller triangle ( (sqrt1802)/2) anyone?

Differential question was deceivingly tricky. It looked almost too simple. I'm not sure. As it said write down the differential equation I assumed we did not have to do any working out for that part.

dh/dt = a.cos(kt) right?

then max. when a.cos(kt) = 1.3

when kt=0, a = 1.3

then I just guessed k = 12? As it occurs once every 12 hours.

The last question I got something like 364~ cm, give or take 5cm.

Also question 2d I found difficult, only realised after the exam you could draw triangles to find sin(beta) and cos(beta). Hoping here I get 2 marks for method though.

Overall I think I've dropped around 8-10 marks. By far my lowest mark out of all the past papers I did.
13. (Original post by georgeherby)
i think you had 256 but you had to subtract 16 as the sin when to zero but the cos was 16 so C=240
Fair enough, just hope i intergrated by parts correctly then.
14. (Original post by AmyLH)
Got some weird numbers for the coordinates of D, all over 17. Can't remember what I got for the last bit.

For the writing a differential equation what did everyone get? I put something like

1.3cos(30t)

A complete guess

Posted from TSR Mobile
Same
15. (Original post by AmyLH)
Got some weird numbers for the coordinates of D, all over 17. Can't remember what I got for the last bit.

For the writing a differential equation what did everyone get? I put something like

1.3cos(30t)

A complete guess

Posted from TSR Mobile
I got 1.3 but didn't get 30, I can't remember what I got for that but I know my answer wasn't right. Hopefully forming the equation was 1 mark and to work out the 2 contants was the other 2 marks then it means I might have only lost 1 mark in that question
16. I'm normally good at trig aswell, how do you do that one with 4x^3-11x-3=0

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17. Peace of piss 100UMS run at me
18. (Original post by Lay-Z)
I'm normally good at trig aswell, how do you do that one with 4x^3-11x-3=0

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You use your first part by splitting the f(x) into 3 factors equalling 0, then replace x with sinO.

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19. Anyone feel like doing an unofficial markscheme?
Hope everyone did better than they thought and the grade boundaries are low!
20. (Original post by Lay-Z)
I'm normally good at trig aswell, how do you do that one with 4x^3-11x-3=0

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ooo I managed to do that one, you had to turn the cos2theta bit into 1-2sin^2(theta) than tou times out the brackets and subbed in x to get the answer. Then you factorised the 4x^3 bit and you got something like x=3 and x=-1/4, then you subbed sin(theta) back into the x and worked it out. I cant' remember what I got though

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