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EDEXCEL mechanics 3/ june 06 pm

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.A.
Heh if you think this was harder than Jan 08 then we are all fine. Because grade boundary for that was like 55 i think.

Pressure? thats what you have to tell us.

.A.


There was nothing really tricky in the Jan 08 paper though. Fine the energy question required a bit of diagram manipulation but thats about it.

Hopefully the boundaries are low. :p:
Reply 81
Avatar for kcfch
kcfch
14
.A.
Heh I am really worried about SHM. Did you guys what did you get for the distance away from B.

.A.

it was 0.016m away from B is that what you got? because you had to take what you found out away from 0.12m
kcfch
it was 0.016m away from B is that what you got?

I got that. :smile:

As for grade boundaries, I thought it was much harder than January 2007 which was 56/75 for an A.
Reply 83
Avatar for .A.
.A.
Can someone remind me what W was in shm so that I do the calculation now.

a=0.12. t=2

.A.
.A.
Can someone remind me what W was in shm so that I do the calculation now.

a=0.12. t=2

.A.

I think it was: ω=2π3\displaystyle\omega = \frac{2\pi}{3}
Which would have meant that T = 3 seconds, but I'm not sure.
Reply 85
Avatar for .A.
.A.
Alright. 0.0161 (3.s.f) was the right answer.

.A.
alex_hk90
I think it was: ω=2π3\displaystyle\omega = \frac{2\pi}{3}
Which would have meant that T = 3 seconds, but I'm not sure.


I got that as well :smile:
Finally something I recognise!
Reply 87
Avatar for .A.
.A.
Does anyone remeber the answer for question 1.
Reply 88
Avatar for kcfch
kcfch
14
.A.
Does anyone remeber the answer for question 1.

the first part was a show that, which i got, but i tihnk my method was completely wrong. the second part was about ...oh yeah the velocity as it reaches the tube end right? yeah i did
gain in KE + gain in GPE = loss in EPE
then lots of number crunching :biggrin: i cant remember my final answer though
Reply 89
Avatar for ahezhara
ahezhara
I knew exactly what to do on q3, but I panicked and didn't write it down. :frown:
Reply 90
Avatar for AlphaWulf
AlphaWulf
Urf, I found this exam really hard. Granted, I tried this with nil revision since I had a crazy-hard exam before it, but it was still really difficult.

Didn't manage to do the last question, but I did reduce it to the integral I think (though think I forgot to root the 6). Doing FP2 so I should have been able to do it more. :redface:

It's also very annoying that in the last minute I realised I hadn't done a 6 mark question. :eek:

.A.
Alright. 0.0161 (3.s.f) was the right answer.

.A.


Hehe don't remember this, is this for the distance from B in that SHM question?
Reply 91
Avatar for IChem
IChem
11
alex_hk90
That sounds familiar; if I remember correctly:
ω=2a5g\displaystyle \omega = \sqrt{\frac{2a}{5g}}
But I can't remember the working.



I'm SURE the question was find omega in terms of g and h....

Anyway, I got ω=2gh\omega = \sqrt{\frac{2g}{h}} ....I think.

That was the biggest bitch of a paper that I have ever had the displeasure in taking. I hope the grade boundaries are really low.
AlphaWulf
Hehe don't remember this, is this for the distance from B in that SHM question?

Yes it was, the last part of the SHM question.
Reply 93
Avatar for kcfch
kcfch
14
IChem
I'm SURE the question was find omega in terms of g and h....

Anyway, I got ω=2gh\omega = \sqrt{\frac{2g}{h}} ....I think.

That was the biggest bitch of a paper that I have ever had the displeasure in taking. I hope the grade boundaries are really low.

ohyeah maybe it was g, in that case i got rt(2g/5h)
Reply 94
Avatar for MaLvI
MaLvI
OP
can somebody remind me of question 3 ?

Btw i recall an answer smthing like 4/15 rt15
did anyone else get smthing like that?
Reply 95
Avatar for brkr
brkr
the paper was really hard...much harder than the other papers BY FAR ... i got like 90% in Jan08..but this paper...go knows.... :frown:
Reply 96
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brkr
*god
IChem
I'm SURE the question was find omega in terms of g and h....

It might have been; I can't remember it that well, only that there was a 2/5 involved.

IChem
That was the biggest bitch of a paper that I have ever had the displeasure in taking. I hope the grade boundaries are really low.

I agree, I think that 54/75 would not be unreasonable for an A.
Reply 98
Avatar for Sepulamb
Sepulamb
I recall an answer of T=3mg
Reply 99
Avatar for kcfch
kcfch
14
Sepulamb
I recall an answer of T=3mg

hmmm i remember a T=3/2 mg dont remember a 3mg though...do you remember which question?

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