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# MEI OCR C4 Thread watch

1. Well, C4 is less than a week away now and im not quite up to scratch on everything.

In particular, im having trouble with vectors / planes, and parametric equations can be quite difficult too.

Feel free to post questions for other people to answer or if you need help you can post here too
2. how you feling about the comprehension paper? Hopefully it shouldn't be too bad!
3. Im not sure about that one. It should be pretty easy but when we were looking at them in class i found it hard to take in all the information - probably because everyone was chatting and i couldnt concentrate though
4. Oh yeah.....is it true that we will not be tested on small angle approximations from the trig chapter? thats what my teacher told me.
5. I havent heard about that so i would learn it just in case. There isnt all that much to it.

When θ is small and measured in radians

Sinθ ≈ θ
Cosθ ≈ 1 - θ2/2
Tanθ ≈ θ

6. (Original post by Cortez)
I havent heard about that so i would learn it just in case. There isnt all that much to it.

When θ is small

Sinθ ≈ θ
Cosθ ≈ 1 - θ2/2
Tanθ ≈ θ

Have you been doing the practice papers? nothing in them with regards to this. Yeah, i reckon its best to learn it just in case.
How did you find C3 if you don't mind me asking? i thought it was harder than the practice papers.
7. Yeah ive been doing the practice papers and havent found a question on them but you never know. I though C3 went pretty well actually but exam results will tell
8. could someone show me how to do q9)ii) of practice paper C4 - C, about vector AM. I dont know where the 9/13 came in the mark scheme? Any help would be much appreciated.
thanks
9. anyone?
10. Just wondering what the difference is between MEI and normal OCR. All the MEI stuff seems a lot harder, or is this just me?
11. (Original post by fabz)
Just wondering what the difference is between MEI and normal OCR. All the MEI stuff seems a lot harder, or is this just me?
No, not really, Mei is just a new version of OCR, and it is alot easier, I mean that! I do Mei Math.

12. (Original post by bachelor)
could someone show me how to do q9)ii) of practice paper C4 - C, about vector AM. I dont know where the 9/13 came in the mark scheme? Any help would be much appreciated.
thanks
heh i think thats a mistake because i cant understand it either. Surely you just let λ = 2/3? Which gives a totaly different answer.

Im scanning it in now - will attach when its done. Hopefully someone can help

Edit: Here it is
http://img300.echo.cx/img300/3153/sc...00509333up.jpg
You might want to save it and rotate it
13. yeah thats what i thought as well, 2/3. Bloody exam board, cant even get together decent mark schemes.
14. I'm on the same question on C4-C...

If AN was 9/13 of AM, then NM would be 4/13 of AM, but that's not a ratio of 2:1.

While I'm here, does anyone know the answer to q. 3 on C4-C?

Curve y²=x - 1 is rotated round x-axis between 1 and 3

Surely it's V = ∫πy²dx between 1 and 3
Which is the same as ∫x-1dx between 1 and 3

But in the mark scheme they have V = ∫πx^4dx between 0 and 2?

Sorry i would scan it in but I don't know how!
15. Did they definitely give the curve in this form y²=x - 1?

Does it say how much they rotated it by because otherwise that's a bit dodgy..
16. (Original post by prittstick)
I'm on the same question on C4-C...

If AN was 9/13 of AM, then NM would be 4/13 of AM, but that's not a ratio of 2:1.

While I'm here, does anyone know the answer to q. 3 on C4-C?

Curve y²=x - 1 is rotated round x-axis between 1 and 3

Surely it's V = ∫πy²dx between 1 and 3
Which is the same as ∫x-1dx between 1 and 3

But in the mark scheme they have V = ∫πx^4dx between 0 and 2?

Sorry i would scan it in but I don't know how!
The answers to that question is wrong too. I had to ask my teacher about that because it didnt make any sense what so ever and he said it has got to be wrong.
17. (Original post by Spenceman_)
Did they definitely give the curve in this form y²=x - 1?

Does it say how much they rotated it by because otherwise that's a bit dodgy..
Yeah, the question exactly is:

"The curve y²=x-1 for 1 <* x < 3 is rotated 360° about the x-axis. Find the volume of the solid formed"

*< in this case is actually "less than or equals to" but I don't know how to make that sign!

Edited to say -
Oh that is good cortez! Well good in the sense that it isn't me who doesn't know what I'm doing...damn MEI and their silly mistakes

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