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Ocr (mei) c2 exam paper 18/05

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Original post by Axion
y=100x^3


sounda fine :smile:
Reply 41
Avatar for mathsodoku
mathsodoku
4. Point P=(6,3)

(i) y=3f(x)

Point P now= (6,9)

(ii) Y=f(4x)

Point P now= (3/2,3)
Reply 42
Avatar for xayno
xayno
About question 6 (logs one) will I still get the marks (if yes how many ?) if my answer was
y = 10^(3log(x) + 2)

(which is working but there is simpler version of it which is y= 100x^3)
Reply 43
Avatar for Gilsenan
Gilsenan
1
The sin equation - surely 7.02 isn't a solution as it's outside the range?

Thanks for the mark scheme though
Reply 44
Avatar for xayno
xayno
Original post by mathsodoku
4. Point P=(6,3)

(i) y=3f(x)

Point P now= (6,9)

(ii) Y=f(4x)

Point P now= (3/2,3)


Isn't it

4. Point P=(6,3)

(i) y=3f(x)

Point P now= (6,9)

(ii) Y=f(4x)

Point P now= (1.5,3)

because it's one way strech parallel to the x-axis scale factor 1/4

correct me if im wrong
Original post by xayno
Isn't it

4. Point P=(6,3)

(i) y=3f(x)

Point P now= (6,9)

(ii) Y=f(4x)

Point P now= (1.5,3)

because it's one way strech parallel to the x-axis scale factor 1/4

correct me if im wrong


that's exactly the same but with a decimal :smile:
Reply 46
Avatar for mathsodoku
mathsodoku
5. Area Of A Sector= 45cm^2

45cm^2= 1/2 *r^2 *1.6
(45)=0.8*r^2
(45)/0.8 = r^2
56.25=r^2
SQRT(56.25)= r
radius= 7.5

r*(1.6)= Arc length
7.5*(1.6)= 12
Arc length=12

12+(2*7.5)= perimeter

perimeter= 27
Anyone want me to write my solution for the last part or has someone else posted it?
Reply 48
Avatar for mathsodoku
mathsodoku
Original post by AspiringGenius
that's exactly the same but with a decimal :smile:


yeah exactly the same.
Original post by Gilsenan
The sin equation - surely 7.02 isn't a solution as it's outside the range?

Thanks for the mark scheme though


I guess you are right, I didn't get it in the exam as well. I thought sin2theta should have 4 values. Lost about 17 marks.
I think its 3.52.
(edited 11 years ago)
Reply 50
Avatar for xayno
xayno
Original post by mathsodoku
yeah exactly the same.


sry i missread it ;d


could anyone help me with that :


About question 6 (logs one) will I still get the marks (if yes how many ?) if my answer was
y = 10^(3log(x) + 2)

(which is working but there is simpler version of it which is y= 100x^3)
Original post by farhadarwin
I guess you are right, I didn't get it in the exam as well. I thought sin2theta should have 4 values. Lost about 17 marks.


It did... din;t it?

*tumbleweed*
Reply 52
Avatar for Gilsenan
Gilsenan
1
Original post by AspiringGenius
It did... din;t it?

*tumbleweed*


It does - if you draw the graph of sin2x you'll see you get 4 points of intersection with the line y = 0.7 :smile:
Reply 53
Avatar for mathsodoku
mathsodoku
q7. dy/dx = 6x^(1/2) -5
intergrate to.... y = 4x^(3/2) -5x + c passing thru (4,20)
20=4(4)^(3/2) -5(4) + c
c= -24

equation of line: y= 4x^(3/2) -5x -24
Original post by Gilsenan
It does - if you draw the graph of sin2x you'll see you get 4 points of intersection with the line y = 0.7 :smile:


phew.
Reply 55
Avatar for xayno
xayno
Original post by mathsodoku
q7. dy/dx = 6x^(1/2) -5
intergrate to.... y = 4x^(3/2) -5x + c passing thru (4,20)
20=4(4)^(3/2) -5(4) + c
c= -24

equation of line: y= 4x^(3/2) -5x -24




That's how i got it

dy/dx = 6x^(1/2) - 5
integrated = 4x^(3/2) - 5x + c passing thru 4,20
20 = 4(4)^(3/2) -5(4) + c
20 = 32 - 20 + c
8 = c
Original post by xayno
sry i missread it ;d


could anyone help me with that :


About question 6 (logs one) will I still get the marks (if yes how many ?) if my answer was
y = 10^(3log(x) + 2)

(which is working but there is simpler version of it which is y= 100x^3)


In worst case you should lose one mark I think.
Reply 57
Avatar for Axion
Axion
15
Original post by mathsodoku
q7. dy/dx = 6x^(1/2) -5
intergrate to.... y = 4x^(3/2) -5x + c passing thru (4,20)
20=4(4)^(3/2) -5(4) + c
c= -24

equation of line: y= 4x^(3/2) -5x -24


err no, its 8 not -24
did anyone get a=10 and r=0.6 and a=15 and r=0.4 for the first part of the last geometric qu? about 7marks i think, had no idea how to do part 2 about 3 marks????
Original post by enlighten25
did anyone get a=10 and r=0.6 and a=15 and r=0.4 for the first part of the last geometric qu? about 7marks i think, had no idea how to do part 2 about 3 marks????


I got the same and the last part was :s-smilie: Im hoping for low grade boundaries

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