Yes, but usually the curve is only in one quadrant.

Today, since it was in 2 quadrants, rotating it 180 degrees is the same as rotating the graph of it in only 1 quadrant by 360 degrees

Reply 66

betapro

2

The vol of revolution was both 8pi/3 an 16pi/3 they accept both but pretty sure mainstream is multiply by pi/2

Reply 67

ComputerMaths97

17

Paper seemed tough but very doable. Hoping I still got full ums. Should be lower grade boundaries in my opinion

If anyone has any questions about the exam today I'll be sure to help - a lot of my friends asked more pre-exam questions to me than usual. Was a tough paper.

Reply 68

decombatwombat

2

Original post by betapro

The vol of revolution was both 8pi/3 an 16pi/3 they accept both but pretty sure mainstream is multiply by pi/2

http://vle.woodhouse.ac.uk/topicdocs/maths/PastPapersfile/C42015May.pdf

The MS for last years paper only allows pi, and the situation is pretty much the same.

Reply 69

124saffff0tjg

1

didn't get the second part of question 5, other than that amazing paper

Reply 70

aelahi23

2

Original post by decombatwombat

The stacked triangles i think.

Oh right yeah, I did part 5i) easily but 5ii) I didn't right the ratio because i ran out of time

I got something like for the length of the triangle on top 2xSin(theta)
and the side length of the bottom triangle to be xTan(theta)

Which would have the ratio of 2Cos(theta) I think
tell me if i am wrong

Reply 71

124saffff0tjg

1

exaxctly what i did ^

Reply 72

Fhhafhhs

Can someone make an unofficial markscheme 😅

Reply 73

oopqoo

7

I want C4 to get done in the butt by something roughly godzilla sized.
The same butt that was clearly responsible for producing the questions on that paper.
Thanks, OCR. Goodbye, university. :smile:

Reply 74

prepdream

9

Original post by decombatwombat

http://vle.woodhouse.ac.uk/topicdocs/maths/PastPapersfile/C42015May.pdf

The MS for last years paper only allows pi, and the situation is pretty much the same.

Alright I see. They allow pi/2 but only accept pi for the final result, so reckon I would lose 1-2 marks prolly :smile:

Overall, was a good paper!

Reply 75

Daniel9998

15

Original post by ComputerMaths97

Paper seemed tough but very doable. Hoping I still got full ums. Should be lower grade boundaries in my opinion

If anyone has any questions about the exam today I'll be sure to help - a lot of my friends asked more pre-exam questions to me than usual. Was a tough paper.

what do you think the grade boundary will be for an A this year?

Reply 76

Crozzer24

7

Horrible paper. Somebody please explain question 6 the parametric equations one

Reply 77

decombatwombat

2

Original post by Crozzer24

Horrible paper. Somebody please explain question 6 the parametric equations one

Find dy/dx

Do y -y1 = m(x-x1) to find the general equation of a tangent using x =2t y =1/t

Find the x and y intercepts by subbing in 0 for x and y

Then the Area = 1/2 x OQ X OR = 8 which is independent of t

Reply 78

prepdream

9

Original post by Crozzer24

Horrible paper. Somebody please explain question 6 the parametric equations one

Basically turn it into an equation and then differentiate it. Then find the equation of the tangent. Sub x=0 and y=0 to find the side of the triange. When you try to calculate the area afterwards, the result should be a number without t :smile:

Reply 79

124saffff0tjg

1

i used chain rule but got the same, ended up with 8t/t so t's cancel

OCR MEI C4 Mathematics June 2016 - Official Thread

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