OCR C4 (not mei) 18th June 2013 revision

THAT EXAM SHOULD HAVE BEEN MORE THAN AN HOUR AND A HALF! Didn't have time to freaking think! ugh

What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.

I got thirty something... Some people got 171, but that doesn't make sense to me, because it's a triangle :s

Reply 462

IShouldBeRevising_

2

Original post by a10

9.33 for the volume :biggrin:

30. something for the Differential Eq :biggrin:

Yes thats whay i got for the volume... glad i know i got something right.

Reply 463

Maid Marian

20

Original post by wandi

THAT EXAM SHOULD HAVE BEEN MORE THAN AN HOUR AND A HALF! Didn't have time to freaking think! ugh

Yeah I struggled with the timing on this one. I usually have lots of time left at the end in maths exams, but I didn't today :s-smilie:

Reply 464

SexyAndIKnowIt.

1

Original post by louise_234

i put minimum but not sure, i worked out the gradient a point next to it and the gradient increased :s

PI put point of inflection :frown:

Reply 465

AlesanaWill

16

Original post by Maid Marian

What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.

Yeah I got something like that. 171.3 or something.

Posted from TSR Mobile

Reply 466

ActaNonVerba

Original post by Maid Marian

That's what I did, but apparently it's not right and I didn't think it could be right either because it was worth 5 marks :s-smilie:

You had to divide it by 2 (dy/dx of 2x)

Reply 467

Maid Marian

20

Original post by Croydon'Stepper

I got thirty something... Some people got 171, but that doesn't make sense to me, because it's a triangle :s

Hmm. Yeah I think 171 was what I got, but exactly how could that be right!

I just don't know ...

Reply 468

Vip3rgt9

10

Original post by AlesanaWill

No there should be 3. I plotted it on a graphical calculator and there were 3.

Posted from TSR Mobile

Yeah, I hope you're right. I can't see why there wouldn't be three?

Reply 469

RandomMedic

11

Original post by Maid Marian

What did people get for the angle BAC or whatever it was?

At first I got 8. something, then I scribbled it out and had a three digit number with a 1 and 7 in it.

I got 8.something.

You did it again and got the negative. Both are right, because if you think, when two lines meet there is always an obtuse and acute angle. They didn't specify which they wanted, so mark schemes always allow both.

The only problem is which one is used in the volume equation, and I'm not sure about that one

Reply 470

ActaNonVerba

Original post by AlesanaWill

Yeah I got something like that. 171.3 or something.

Posted from TSR Mobile

Didn't it say acute angle, which would be 180-your answer? I put both down just in case

Reply 471

Maid Marian

20

Original post by ActaNonVerba

You had to divide it by 2 (dy/dx of 2x)

I don't understand that? :frown:

I don't understand why you have to divide by 2...

Reply 472

eggfriedrice

16

Isnt it slightly unfair people can plot the graphs using theirs calculators during the exam? :| "pay £80 and get a slight advantage. " Meh.

Reply 473

a10

19

for the tan question my final integral was

-2ln(2- sec^2(x))

and I subbed in values wrong for the first part so I ended up with

(-2 ln 2/3) + -2ln(-6+4root 3)

can someone confirm whether they the -6+4 root 3 part?

Reply 474

Vip3rgt9

10

Original post by metabalo

for question 8i) i got:
i)50r^0.5 = 9t + 105

anyone else get this or did i completely mess itup?

I got something with r^(3/2) in it.

Reply 475

ActaNonVerba

I can see grade boundaries dropping to about 50 for an A (52 is the lowest it's ever dropped)

Reply 476

SJ12345

Original post by Croydon'Stepper

I got thirty something... Some people got 171, but that doesn't make sense to me, because it's a triangle :s

I got 8.68

Reply 477

Maid Marian

20

Original post by Holz888

I got 8.something.

You did it again and got the negative. Both are right, because if you think, when two lines meet there is always an obtuse and acute angle. They didn't specify which they wanted, so mark schemes always allow both.

The only problem is which one is used in the volume equation, and I'm not sure about that one

Aaaah. So they were both right. I used the 171 for the volume, but I think that's wrong.

Reply 478

AlesanaWill

16

Original post by Holz888

I got 8.something.

You did it again and got the negative. Both are right, because if you think, when two lines meet there is always an obtuse and acute angle. They didn't specify which they wanted, so mark schemes always allow both.

The only problem is which one is used in the volume equation, and I'm not sure about that one