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# OCR MEI Core 4 (C4 4754/01 and 4754/02) watch

1. (Original post by A100whoo)
What did people write for the last question on the comprehesion???
10cm
2. (Original post by GenericStudent)
For the partial fractions question, did A=1 and B=-1? Because I swear I messed something up round there..
I got them values. i'm sure they are right...
3. (Original post by GenericStudent)
For the partial fractions question, did A=1 and B=-1? Because I swear I messed something up round there..
thats what i got, in fact, you had to get that to be able to do the second part of the question
4. I got question 2 on the comp to be 96.1 km/h and 110kg or something, but I know thats wrong. I probably differentiated wrong or something. Reckon I'll get any follow through marks?

Also, for the last comprehension q, I put C as the amount of CO2 generated of a mm or 10cm is minimal, which I also think is wrong.
5. I thought both parts of the paper went really well
6. (Original post by A100whoo)
What did people write for the last question on the comprehesion???
Answer was 10cm, as it goes up to 4dp, which is multiples of 10cm. (I wrote mm cos I made a mistake)
7. (Original post by A100whoo)
What did people write for the last question on the comprehesion???
100*1.641444(cant remember exact) = 164.1444 km
= 16414.44 cm
= 164144.4 mm therefore a = to nearest mm

eek. looks like i got it wrongggg
8. (Original post by Hippysnake)
I got question 2 on the comp to be 96.1 km/h and 110kg or something, but I know thats wrong. I probably differentiated wrong or something. Reckon I'll get any follow through marks?

Also, for the last comprehension q, I put C as the amount of CO2 generated of a mm or 10cm is minimal, which I also think is wrong.
Was 100 km/h with 101.10 g or something
9. (Original post by Hippysnake)
I got question 2 on the comp to be 96.1 km/h and 110kg or something, but I know thats wrong. I probably differentiated wrong or something. Reckon I'll get any follow through marks?

Also, for the last comprehension q, I put C as the amount of CO2 generated of a mm or 10cm is minimal, which I also think is wrong.
oh crap, it asked for the kg part?!

i got speed to be 100, because 0 = 3x^2 - 200x -10000 = (3x + 100)(x - 100)
10. how to do question 3
x=cos2X y=cosXsinX
11. For the comprehension graph, were you supposed to just draw 5 horizontal lines for the correct boundaries, or a curve/line?

I got 10cm for Q5 in the comprehension, I think I messed up 2 parts of the vector question so unless the markers are kind there goes my A* .
12. (Original post by Muffinz)
100*1.641444(cant remember exact) = 164.1444 km
= 16414.44 cm
= 164144.4 mm therefore a = to nearest mm

eek. looks like i got it wrongggg
1.641444 * 100 = 164.1444
=164144.4 = metre
16414440 = cm
13. (Original post by tlky)
how to do question 3
x=cos2X y=cosXsinX
I did:
and then use the identity.
14. For Q5 on the comprehension I put to the nearest 10cm because that's as accurate as the number of significant figures can provide.

What did everyone do with the vectors question, where you had to calculate the angle of the pipeline with the vertical? I basically found the dot-product of the pipeline's direction vector with the unit vector in the z-direction and used the formula cosθ = a.b/|a||b| to calculate the angle it made with this unit vector. Would that be a reasonable method?
15. (Original post by Muffinz)
100*1.641444(cant remember exact) = 164.1444 km
= 16414.44 cm
= 164144.4 mm therefore a = to nearest mm

eek. looks like i got it wrongggg
thats exactly what i did!

I think its wrong too
16. (Original post by JoshC)
1.641444 * 100 = 164.1444
=164144.4 = metre
16414440 = cm
oh right. woops
17. Ok so I thought it was an OK exam.

There seems to be differing answers about the last question. Personally, I put C as, if you re-read the section on accuracy in text, it claimed that even 2 significant figures for the carbon dioxide would be accurate enough.

I realise that the question specifyed a distance though; so I simply put that, since the sig figs were negligible for the carbon dioxide, in this case scenario (and especially if you had wanted to convert the distance into carbon d. mass emissions) the sig figs would also be negligible for miles.

Either way, bit of an ambiguous question.
18. (Original post by OL1V3R)
For Q5 on the comprehension I put to the nearest 10cm because that's as accurate as the number of significant figures can provide.

What did everyone do with the vectors question, where you had to calculate the angle of the pipeline with the vertical? I basically found the dot-product of the pipeline's direction vector with the unit vector in the z-direction and used the formula cosθ = a.b/|a||b| to calculate the angle it made with this unit vector. Would that be a reasonable method?
i dunno! that stumped me lol. i think i put:

say AB =
300
100
100

i used that and
0
0
100

or something
19. (Original post by A100whoo)
thats exactly what i did!

I think its wrong too
You've forgotten metres there..
20. (Original post by OL1V3R)
What did everyone do with the vectors question, where you had to calculate the angle of the pipeline with the vertical? I basically found the dot-product of the pipeline's direction vector with the unit vector in the z-direction and used the formula cosθ = a.b/|a||b| to calculate the angle it made with this unit vector. Would that be a reasonable method?
That's what I did.

What were you supposed to do for the last part of the vector question? I found the angle between the normal from the plane, and the AB direction vector, but then I left the answer as that angle. Were you supposed to do something else with that answer?

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