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Edexcel M2 - 28/01/11 Watch

1. (Original post by CapsLocke)
x
Haha I got those values too!
The only one I couldn't do was the prove question on 6a
2. (Original post by The Lolly Pop Guy)
Does anyone have the solutions?
I have to say most of the past papers were easy to complete, this paper however was in a different league.
It was tough.
3. (Original post by Ultimate1)
OK here's from what I can remember:

Centre of mass Q : 12.3 and 12.9 and the angle was 28
Last Q: the velocity you got was 2/9 which was in the positive direction and hence it hit the wall again.
For the vlocity question where the particle was 10 m above the cliff I was 2.03s and 0.2 seconds for the time Q's and got 3root2 as the value of v (Obviously wrote that as decimals which was 4. something)
For the other projectile Q I got t as root4 and root2 (Again wrote these as decimal)
For the Q where the box was dragged from A to B I remember putting down 8400 or something like that and the speed as 10 ms-1 (Rounded to 2 sf) when it passed b.
I think I got the KE energy one wrong though as I got 3 J but I worked out KE lost which you weren't meant to
For the moments one and the lowest value of u I got 0.51.
pretty sure COM is 11, 11, as it was symmetrical therefore distance from both sides is the same
4. (Original post by CapsLocke)
pretty sure COM is 11, 11, as it was symmetrical there distance from both sides is the same
5. This paper was mental, and I think got the ten marker wrong! ¬¬
6. Question 4.

For the work done question I got something like 8084J (something like that)

For the speed down that slope I got 10.24ms-1

Question 5. For centre of mass I got 11cm from AB and 11cm from BC...it was symmetrical lamina so pretty straight forward.

For the vertical angle with AB, I did tanx = 11/25 and solved for x giving ~23.7 degrees = 24 (rounded to nearest degree)

Question 7. I got µ = 0.514

Question 8. Speed of ball P = + 2/9, where + velocity is in the direction towards wall therefore it will collide.

That's all I can remember.
7. what did you guys get for the velocity vector, question 6c,
8. yeah COM is 11 for x and y
9. (Original post by Panda Vinnie)
Question 4.

For the work done question I got something like 8084J (something like that)

For the speed down that slope I got 10.24ms-1

Question 5. For centre of mass I got 11cm from AB and 11cm from BC...it was symmetrical lamina so pretty straight forward.

For the vertical angle with AB, I did tanx = 11/25 and solved for x giving ~23.7 degrees.

Question 7. I got µ = 0.514

Question 8. Speed of ball P = + 2/9, where + velocity is in the direction towards wall therefore it will collide.

That's all I can remember.
did you round your angle up to 24, asked to the nearest degree
10. (Original post by CapsLocke)
Okay here are my answers to M2, I'm not entirely sure on these answers so don't take my word for it.

1. a) v = 12
b) a = 4/45 = 0.0889

2. a) 29 J

3. a) t^4 - 6t^2 + 8
b)1/5 t^5 - 2t3 + 8t
c) t = 2, t = 1.41 = root 2

4 a) couldn't do it
b) 10.24

5 a) 11, 11
b) 24

Not sure about question 6, could someone confirm if this is right?
6 a) .. prove
b) 2.03
c) v = 3i + (5+9.8)t
d) 0.204
e) 3root2

7. mew = 0.514

8 a) prove m = 4
b) v = 2/9 therefore moving towards the wall.
Do you (or anyone else) remember the marks for each question? I got the same for 6 btw, except I'm not sure exactly on the proof part. Did you do it by integration? I tried to but couldn't get it so showed it using suvat equations.
I think it was a fair paper, though I messed it up pretty badly. Lost 10 marks for the coefficient of friction question because I took the cosine of the angle wrong (and as a result got a ridiculous answer and changed my entire method which would have been right, so goodbye method marks)
Somehow managed to get 1b wrong as well by the looks of it. hmm, not happy.
11. (Original post by CapsLocke)
pretty sure COM is 11, 11, as it was symmetrical therefore distance from both sides is the same
Did anyone get meuw as 0.157 ??
On the root questions I put +/- root 2 and +/- 2 would I lose a mark for the negative?
12. How did people work out the my? Mine came out with some evil simultaneous equations. I think I got 0.477 or something.

I got 11,11 and 23 degrees for centre of mass.
Everyone's right with 2v/9 for last question.

Difficulty of paper: moderate - challenging
13. (Original post by CapsLocke)
what did you guys get for the velocity vector, question 6c,
3i + (5-gt)j I think?

Maybe +gt actually. I've completely forgotten my answers now I'm all paranoid >.>
14. (Original post by CapsLocke)
did you round your angle up to 24, asked to the nearest degree
Yeah I did I remember reading 'to the nearest degree' at the VERY last minute when checking my paper! Close call!
15. meh I got the centre of mass wrong and Qu 2. Should hopefully be 90, if not I've still got my 87 from last time.

Didn't really revise for this paper though so meh.
16. So what did everyoen think of this paper copmpared to the past papers? Difficult? Moderate? Easy?
Did anyone get meuw as 0.157 ??
On the root questions I put +/- root 2 and +/- 2 would I lose a mark for the negative?
You might get the marks I think...but logically, time can't be negative and the question gave the inequality 0 <= t <= T
18. (Original post by i_hate_teeth)
So what did everyoen think of this paper copmpared to the past papers? Difficult? Moderate? Easy?
I personally thought it was quite challenging. I'd reckon the grade boundaries to be at about ~58
19. (Original post by Andy Ftw)
3i + (5-gt)j I think?
you sure it was -gt? i got +gt
20. (Original post by Ultimate1)
I personally thought it was quite challenging. I'd reckon the grade boundaries to be at about ~58
I recon they will be similar to Jan 2004
Jan-04 64 57 50 43 37 31 25

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