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

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Reply 640

I Hate Edexcel

Original post by Jamie T

that's all I did too. probs just the one mark.

Damn. It seems so obvious now that k should be pi/6 grrrrr

Reply 641

I Hate Edexcel

The fact that there were loads of messy calculations made me think I was doing it wrong all the time...

Reply 642

olliefoss

Can I get full marks on 8a by using inspection, I got the right answer I think?

Reply 643

Student Number 4

Original post by I Hate Edexcel

The fact that there were loads of messy calculations made me think I was doing it wrong all the time...

Same. I think I went over the easy questions a few times each because the calculations were so chaotic.

Reply 644

Qwob

Original post by olliefoss

Can I get full marks on 8a by using inspection, I got the right answer I think?

Absolutely. It would be ridiculous if they didn't give you the full marks as long as you got the right answer at the end too.

Reply 645

I Hate Edexcel

Original post by Student Number 4

Same. I think I went over the easy questions a few times each because the calculations were so chaotic.

Yeah, so then I was rushed to do the harder questions. Wahhh... I'd personally say this paper was harder than January 13.

Reply 646

Qwob

Original post by Nebula

I'm not completely sure but I think it's (-3, -11, 10).

Could you run over your working of how you found E?

Reply 647

Jamie T

Original post by I Hate Edexcel

Damn. It seems so obvious now that k should be pi/6 grrrrr

I think you should change Edexcel to AQA in your name.

Reply 648

fizzbizz

Anyone remember what the last two parts of question 2 were? The alpha and beta one

Trying to compose a mark scheme

Reply 649

tehe

for findng the value of k , i thought it was degrees so i put k=30 as then 12x30 = 360 , how many marks would i lose for this ?

Reply 650

Student Number 4

Original post by I Hate Edexcel

Yeah, so then I was rushed to do the harder questions. Wahhh... I'd personally say this paper was harder than January 13.

Atleast you attempted the harder questions :frown:

. I left the last question out D:

Reply 651

Jamie T

Original post by olliefoss

Can I get full marks on 8a by using inspection, I got the right answer I think?

No, you will be terminated. Of cause you would get the marks!

Reply 652

Indy-King

Original post by fizzbizz

Anyone remember what the last two parts of question 2 were? The alpha and beta one

Trying to compose a mark scheme

It was something to do with finding cos and sin beta so it might have been involving sin(2beta)? I'll update if I remember

Reply 653

amish123

For that vector question, where it said find E, did anybody think/do this.

Okay so they said the area of triangle ACD is 3 times the area of ACE.

So seeing AC remains the same for both triangles, the only thing that changes is the distance of the base (CD or CE).

I worked out the |CD| to be rt17 then surely |CE| must be 3rt17

Then I work out the |CE| in terms of mu and got as far as u^2 = +3 or -3.

Then put the back into the general vector for OE and you get E is either (-3,11,10) or (9,7,-2)?

Reply 654

Qwob

Original post by fizzbizz

Anyone remember what the last two parts of question 2 were? The alpha and beta one

Trying to compose a mark scheme

I think the last part was: Prove cos(alpha - beta) = 2/5 (k +sqrt5)

Reply 655

SqueakyMoose

Original post by stuart_aitken

good to know someone got the same as me!!!

I'm pretty sure the equation was 32x/ tcos(t*pi/4)

My working led to:

16x^2 = (4t/pi)(sin(t*pi/4)) + (16/pi^2)(cos(t*pi/4))

when x=4 and t=0, this gives c= 256 - 16/pi^2

Nooooo how the hell did I just get 16/pi^2 for c? :frown:

Reply 656

I Hate Edexcel

Original post by Student Number 4

Atleast you attempted the harder questions :frown:

. I left the last question out D:

Oh noooo

That was an evil paper.

Reply 657

Sweatynerd

What did anyone get for part E of the vectors equation?? I got 17u = 3x(17) and u = plus or minus three or something like that that ?!

Reply 658

Jamie T

I got 44% in the January 2013 paper, and this was worse phaha EVERYONE CHILL OUT YOURE ALL TSR CLEVERS!

Reply 659

edwiin93

I guess doing past papers was pretty useless....
2008 to Jan 2013 doable June 2013 crazy hard
2008-Jan2013
Exponential growth and decay
Rsin(x+y)

june 2013
Knowing that 2X-1=0 calculate the mass of the sun to 6 s.f.

hopefully grade boundaries are really low