OCR M3 (not MEI) - Thursday 11th June 2009 Watch

sonofdot
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#21
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#21
(Original post by robster113)
My answers

1) (i) 0.5
(ii) 2.7 (along line of centres (vertically upwards))

2) (i) 14N
(ii) 15N weight

3 (i) 60 degrees
(ii) 0.5

4 (ii) 32.2

5) (i) 12N

(ii) b) 3.96

6) (iii) 0.8m
(iv) -0.0385, 1.10s
(v) 0.0893

7) (i) v^2 = u^2 - 2ga(1-cos(theta))
(ii) 5ag
(iii) (2-root3)ag
Those answers to 6 look pretty familiar, so we only disagree on 5 - pretty good going! :yep:
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Whitey190
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#22
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#22
What was the question for 6(v)? And why 5ag not 4ag?

Cheers
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miphistor
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#23
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#23
I agree with all of them apart from 6(v), i got like 0.112 i think. But then i expect i was wrong =(

Hopefully this makes up for failure in other fmaths exams (y)
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nuodai
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#24
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#24
(Original post by miphistor)
I agree with all of them apart from 6(v), i got like 0.112 i think. But then i expect i was wrong =(

Hopefully this makes up for failure in other fmaths exams (y)
I believe I got 0.112 for that too (rounded up from 0.1117... or something).
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Whitey190
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#25
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#25
I got that too but isnt the error that we've worked out vm/s when it should be in rads? So v=rw and our answer/r = w??
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sonofdot
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#26
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#26
(Original post by nuodai)
I believe I got 0.112 for that too (rounded up from 0.1117... or something).
IIRC, that was the angluar speed, you had to use v = \dot{\theta} L to find the actual speed
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robster113
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#27
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#27
(Original post by miphistor)
I agree with all of them apart from 6(v), i got like 0.112 i think. But then i expect i was wrong =(

Hopefully this makes up for failure in other fmaths exams (y)
Yeah i got that for angular speed and then you just times by the length (0.8) to get actual velocity. Pretty sure thats right. Minus 1 mark I guess for not converting to velocity.
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nuodai
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#28
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#28
(Original post by sonofdot)
IIRC, that was the angluar speed, you had to use v = \dot{\theta} L to find the actual speed
Ohhhh!

Either way, the fact that I got \dot{\theta} right, implying that I got the rest of the question right, is nothing short of a miracle.
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Init4Beans
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#29
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#29
Went alright, could have been a lot worse. Didnt manage to get the show that out, made a silly error and resolved right for impulse on 1st question and got 1 :banghead: along with a few other silly mistakes. Didnt manage to get the last show that out, dunno what the hell i did :\ but oh well.
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robster113
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#30
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#30
Just re did 6 part 2 b and I think answer is actually 4.23 (using approx m of 0.42)
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corney91
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#31
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#31
(Original post by miphistor)
I'm crapping myself about this exam.... need an A in further maths to get into warwick and I thought that FP3 didnt go too well, so i have to make it up =(
Better go revise....
I'm in exactly the same situation
(Original post by robster113)
Just re did 6 part 2 b and I think answer is actually 4.23 (using approx m of 0.42)
That rings a bell

Seemed a straightforward exam which worries me because I missed some straightforward answers
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richardtan2003
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#32
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#32
lol i think i got question 1 part 1 wrong.. all the rest seems fine though.. hopefully ill get a decent mark. =/
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miphistor
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#33
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#33
(Original post by sonofdot)
IIRC, that was the angluar speed, you had to use v = \dot{\theta} L to find the actual speed
oooh i see! oh wells. That was the hardest question on the paper imo.
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robster113
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#34
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#34
(Original post by richardtan2003)
lol i think i got question 1 part 1 wrong.. all the rest seems fine though.. hopefully ill get a decent mark. =/
To be honest I got stumped on question 1 for a while as in basically all other similar M3 questions impulse is at an angle. Had to come back to this and guess that it had to be vertical as there was no other way. Apparently because it is a "smooth" ball.
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sonofdot
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#35
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#35
(Original post by robster113)
To be honest I got stumped on question 1 for a while as in basically all other similar M3 questions impulse is at an angle. Had to come back to this and guess that it had to be vertical as there was no other way. Apparently because it is a "smooth" ball.
Its funny how that exact same topic was discussed briefly on page one of this thread, and then it came up... :rolleyes:
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Papaya
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#36
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#36
What did you get for the mass of the particle attached to the strings?

Didn't have time for the whole of the last question. I suck at mechanics anyway so I'm happy with my D or whatever :p:
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sonofdot
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#37
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#37
(Original post by Papaya)
What did you get for the mass of the particle attached to the strings?
Wasn't that a show that question? I think it was 0.42kg
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Papaya
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#38
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#38
(Original post by sonofdot)
Wasn't that a show that question? I think it was 0.42kg
Thanks I didn't see the show that and got something like 0.204. There goes my D then :cool:
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Xei
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#39
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#39
Nice paper. Fairly standard fare really, not the trick questions you'd expect from OCR this year, looks like that's just the pure. Lots of show thats so you could blag it too.

The differential equation was a bit fruitier than normal but that was pretty much it.
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around
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#40
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I'm being very rather late (personally I blame chemistry for delaying me):

that exam was an absolute gift after FP 1, 2 and 3.
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