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# AQA Mechanics 2(B) Jan 20th watch

1. Hi everyone!
This is for everyone doing AQA M2 on January 20th!
although, it doesn't seem many people on here are doing it...
could be wrong there.
Discuss the exam
need any help, just ask, i might be able to help
Im ready for this exam and quite looking forward to it, how about everyone else??

peace
(:
2. Im not ready i still need to make sure i do the circle questions correctly - f=ma radially and differential equations mess me up.
3. Hey people.
I'm syked. *does press-ups*
It'll be fine, don't worry about it.
Look for the hidden differential equations if there are any.
4. How did you guys find it?
i found it a bit challenging in places but i think it went well

5. erm it was okay the last ? got on my nerves never done all of it
6. did people get 72 degrees for theta ?
7. i got 70.9 degrees for theta
the last question was a bit confusing, it took a few attempts to get it in the right form..
8. yeh same i messed up on the complete the square bit prob dropped 7 marks altogether
9. i got 70.9 for theta aswell
10. what did you people get for cos(theta) where the particle is no longer in contact with the hemisphere and magnitude of acceleration ?
11. I got cos alpha (or theta w/e) to be (2ag + u^2)/3ag

Dunno if I was right or not.

Edit: For the magnitude of acceleration I put squareroot(144t^4 - 288t^2 + 208) if I remember rightly.
12. (Original post by Shawshank)
I got cos alpha (or theta w/e) to be (2ag + u^2)/3ag

Dunno if I was right or not.

Edit: For the magnitude of acceleration I put squareroot(144t^4 - 288t^2 + 208) if I remember rightly.
i got the same answer for cos alpha

for accelleration magnitude, i got square root((12t^2 -12)^2 + 64) which is the same as yours, but did it say NOT to simplify the answer?

did you guys get 56N for min force?

and what about the centre of mass of the "Artwork" 11,8.2????? anyone
13. Yes well, I gave it as what I did just to separate out the values for t and the constant. I don't know if I'll lose a mark, but I put it like how I did because the question was worth 2 marks Anyhow, it's no big deal. Which question was that 56 N one?

Yes I got 11, 8.2
14. im sure youll get atleast 1 mark if not both, there was a question after the magnitude of acceleration one, it asked for the minimum force magnitude giving you the mass was 7kg

nice one this is good news for the COM (:

how about the differential equation question, i got two values of t (t=30 and t=50) so i just took t=30
and then you had to find the distance which was a bit wiered, i got 210m but i dont know if that one was right...
15. Ha, it's tough remembering the questions I generally don't look back at questions I've done without having to put too much effort in (which probably isn't smart). I seem to recall getting t=30s somewhere.

When it asked for the distance between t =16 and 1s I integrated v (I did it by substitution) and shoved in 16 and 1 as my limits but I don't remember what I got. Perhaps 47 ish?!
16. i know lol, i was sad enough to write my answers down after the exam,
to be honest i cant fully remember it myself, all i know is i got 210, something like -(10/3)(4-0.1t)^3 as the integral..
anyways i cant do anything about it now,
i just hope we all did well (:
17. i got 210 intergration by sub, what you lot get for that work done ? that paper was abit harder than usual
18. oh cool cool thats good news

for the work one,
5 x 40cos30
173.2J
19. ^ Same.

I got the same integral as you, except I don't recall putting the minus sign at the front *facepalm* But even so, I may have, because if I hadn't my final answer would have come out negative... w/e. shouldn't sweat it, I only want a B.
20. i missed out that complete the square ? at the end time run out!!!!! i got t = 1 for that minimum acceleration ?

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Updated: January 20, 2010
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