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# The Official Mechanics 2B Thread, AQA, 29 January 2009 watch

1. Hello guys,

how was the exam? Hard..? Easy...? Do you have any answers?

Thanks

PS: Are we allowed to talk about the exam now? If not then which time are we allowed to talk about it?
2. For AQA I believe we are allowed to talk about the exam as soon as it is over.
I thought it was alright - nothing outrageously difficult or trick questions (that I noticed anyway). I'm bound to have made some silly mistakes but I'm quite happy with how it went.
3. (Original post by mr_t_42)
For AQA I believe we are allowed to talk about the exam as soon as it is over.
I thought it was alright - nothing outrageously difficult or trick questions (that I noticed anyway). I'm bound to have made some silly mistakes but I'm quite happy with how it went.
nice, what did you get a the distance of centre of mass in question 4?
4. Hey, I found couple of questions really tough. But others are perhaps OK. I just wanted to check my answers if anyone else has the same?

Q1-3 I forgot.
Q4a)6.77cm
b)5cm
c)angle=53.5
Q5)c) radius=0.32m
Q6)a)500V
b)2156 m not sure about this
Q7)a) 7.93 ms-1, b)142N
Q9)a)total length=16m and b)ii)47.5m
5. (Original post by mr_t_42)
For AQA I believe we are allowed to talk about the exam as soon as it is over.
I thought it was alright - nothing outrageously difficult or trick questions (that I noticed anyway). I'm bound to have made some silly mistakes but I'm quite happy with how it went.
I got for the first 3 Questions:

1) r = t^4 + 4cos2t +4

2)

a) KE = 432 J
b) i) Proved that KE = 667 J
b) ii) 14.9 ms-1
b) iii) The stone is a particle and no air resistance.

3)

a) v = (e^1/2t -8) i + (2t -6) j
b) i) speed = (e^3/2 -8) i = -3.52 ms-1
b) ii) Direction of travel = in i-drection, West.
c) a = (1/2e^3/2) i = 2.24 ms-2 (Just realised that wrong -.-)
d) 15.7 N (So thats as well wrong :/)

These are my first 3 answers did you get same? any different?
6. Hmm seems like only few people sat this exam
7. Is any one know the answer of Q9
I got 61.6m for 9a)
Part b) correct ^^
c) 65-61.6=3.4m
I wonder if i got part a and c wrong
8. (Original post by lamtinghin622)
Is any one know the answer of Q9
I got 61.6m for 9a)
Part b) correct ^^
c) 65-61.6=3.4m
I wonder if i got part a and c wrong
What did you get for 7a? the speed and b the reaction force and any idea of others?
9. for question 7 i got 66N or something like that for the reaction force and the speed i got was some thing like 4.
10. superstaar,

4.centre of mass question was 11cm, angle was very small.

9ii) was 5.something above the ground
11. Yeah I got 11cm for the centre of mass. I'm recognising a lot of these numbers but can't properly remember what I got for each question without seeing the question itself.

The one about the train took me a while for some reason, even though it was actually quite a standard question in the end. Perhaps I just didn't like all those big numbers!
12. 11cm for the centre of mass, 5.3m for the very last question, not sure I can remember much else! Overall I thought it was a pretty good exam, really, although long.
13. for the angle i got something like 11.3 degrees for the center of mass question and the distance the train traveled was something like 456
14. seems like i got them wrong. What did you guys get for the radius? I got something like 0.322m
15. yeah as far as i remember the radius was 0.3 something
16. (Original post by SuperStaaaR)
seems like i got them wrong. What did you guys get for the radius? I got something like 0.322m
This was my answer.
17. I've got the paper with me, I really messed up question 4,7 and 6b
18. (Original post by saurab01)
for the angle i got something like 11.3 degrees for the center of mass question and the distance the train traveled was something like 456
i got the same values

btw: I can type any question up cus i took the paper with me, thats if someone wants........
19. (Original post by 1Mperios)
i got the same values

btw: I can type any question up cus i took the paper with me, thats if someone wants........
yeah that would be nice if you can put paper up
20. (Original post by 1Mperios)
c) a = (1/2e^3/2) i = 2.24 ms-2 (Just realised that wrong -.-)
d) 15.7 N (So thats as well wrong :/)
i got those. why were they wrong?

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