OCR MEI C4 Mathematics June 2016 - Official Thread

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Reply 100

prepdream

Original post by Maliha01

Did people get 4 for the propotionality constant

Think I got 1/4, not sure about it though. What did everyone get?

Reply 101

Maliha01

Original post by HFancy1997

Some answers I got

-Root10cos(theta+1.249)
-Invalid because4/root10 is bigger than 1
-P=2,Q=-2
-Theta=90,26...?
-volume=16Pie/3
Area was 8
-Q(12.5,6.5,2) not sure about y here
Ratio 3:2?
Last q was show thats
and k=0.811?

I agree with all but Q i got( 2.4, 1.6,2)

Reply 102

username2640523

Original post by slj997

Was it not 8pi/3 as it was only rotated through 180 degrees

no, look at june 15. near exact same question. its because the shape was below the x axis too, so rotation was a full shape

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Reply 103

Qwertykeyboard15

Original post by slj997

What did people get for the Cartesian equation of the plane and the angle between the plane and line AQ

Can't remember the vector of the normal but was something like
2x-Y+2Z -20 = 0

Just depends the number of the normal vector for the values in front of X y and z

Reply 104

ComputerMaths97

Original post by slj997

Was it not 8pi/3 as it was only rotated through 180 degrees

Nope, still the same.

The graph was in 2 different quadrants, so rotating it 180 degrees gives the same volume as rotating the version of the graph with only 1 quadrant plotted, 360 degrees.

Reply 105

Qwertykeyboard15

Original post by Maliha01

I agree with all but Q i got( 2.4, 1.6,2)

I got Q as this

Reply 106

ComputerMaths97

Original post by prepdream

Think I got 1/4, not sure about it though. What did everyone get?

I also got 1/4, although I can't remember the question so can't check it.

Reply 107

Crozzer24

Original post by Maliha01

I agree with all but Q i got( 2.4, 1.6,2)

Yeah I got this too, then ratio was 1:1.5 I think

Reply 108

Qwertykeyboard15

Can anyone remember any answers to paper B?

Reply 109

username2640523

Original post by Maliha01

I agree with all but Q i got( 2.4, 1.6,2)

Ah I meant 12/5 and yeah I remember now thanks!

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Reply 110

jaseho98

That was ridiculously hard

Reply 111

Mr Moon Man

Original post by Maliha01

I agree with all but Q i got( 2.4, 1.6,2)

I got the same for Q

Reply 112

Maliha01

Original post by prepdream

Think I got 1/4, not sure about it though. What did everyone get?

I got 1/4ln(2x+1/2x-l)= t and just thought that we had to multiply by four to get rid of the 1/4 im not entirely sure about it though.... i feel like im wrong

Reply 113

Mr Moon Man

Original post by Qwertykeyboard15

Can anyone remember any answers to paper B?

11.35 for some angle and 104.5 for question 1

Reply 114

ComputerMaths97

If someone can remind me of the questions somehow, I'll get a full unofficial mark scheme done

Reply 115

username2640523

Some answers I got

-Root10cos(theta+1.249)
-Invalid because4/root10 is bigger than 1
-P=2,Q=-2
-Theta=90,26...?
-volume=16Pie/3
Area was 8
-Q(12/5,8/5,2)
Ratio 3:2? might be 2:3 cant remember which way
Last q was show thats
and k=0.811?

Updated

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Reply 116

Maliha01

Original post by Qwertykeyboard15

Can't remember the vector of the normal but was something like
2x-Y+2Z -20 = 0

Just depends the number of the normal vector for the values in front of X y and z