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OCR (non mei) M2 Wednesday 18th May 2016 Watch

  • View Poll Results: Raw marks for 90 UMS
    60
    62.92%
    61
    5.62%
    62
    15.73%
    63
    6.74%
    64
    4.49%
    65
    1.12%
    66
    5.62%

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    Xsanda’s solutions:

    1) Car on a plane:
    i) v = 22.5 m/s
    ii) P = 35.9 kW

    2) Particle up a plane:
    i) Wd = 8.43 J
    ii) v = 10.8 m/s

    3 Arch shape:
    i) show that: 13a/3π
    ii) T = 8.82 N
    iii) θ = 10.9º left of upwards vertical

    4 Particle around a cone:
    i) show that m/6 (2 sqrt3 g - 3 a ω²)
    ii) T = 39.6N, V =1.19 m/s

    5 Ladder:
    i) show that 5W/24 (1+6x/a)
    ii) max x = 1.7a
    iii) tan = 39/14

    6 collisions horizontally:
    i) a: 5.5 m/s, b: 8 m/s, both in opposite direction to their original motion
    ii) e=3/4

    7 projectiles:
    i) 18.8m high, 61.1 m AB
    ii) 87.3 Ns
    iii) 11.9 m
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    you know you're ****ed when they say "5 minutes remaining" and you're still on the ladder question...
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    (Original post by xsanda)
    Xsanda’s solutions:

    1) Car on a plane:
    i) v = 22.5 m/s
    ii) P = 35.9 kW

    2) Particle up a plane:
    i) Wd = 8.43 J
    ii) v = 10.8 m/s

    3 Arch shape:
    i) show that: 13a/3π
    ii) T = 8.82 N
    iii) θ = 10.9º left of upwards vertical

    4 Particle around a cone:
    i) show that m/6 (2 sqrt3 g - 3 a ω²)
    ii) T = 39.6N, V =1.19 m/s

    5 Ladder:
    i) show that 5W/24 (1+6x/a)
    ii) max x = 1.7a
    iii) tan = 39/14

    6 collisions horizontally:
    i) a: 8.33 m/s, b: 3.44 m/s, both in opposite direction to their original motion
    ii) e=0.654

    7 projectiles:
    i) 18.8m high, 61.1 m AB
    ii) 87.3 Ns
    iii) 11.9 m
    I got all the same as you apart from Q6 where I got 5.5 and 8 in reversed directions and 0.75 for e???
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    (Original post by xsanda)
    Xsanda’s solutions:

    1) Car on a plane:
    i) v = 22.5 m/s
    ii) P = 35.9 kW

    2) Particle up a plane:
    i) Wd = 8.43 J
    ii) v = 10.8 m/s

    3 Arch shape:
    i) show that: 13a/3π
    ii) T = 8.82 N
    iii) θ = 10.9º left of upwards vertical

    4 Particle around a cone:
    i) show that m/6 (2 sqrt3 g - 3 a ω²)
    ii) T = 39.6N, V =1.19 m/s

    5 Ladder:
    i) show that 5W/24 (1+6x/a)
    ii) max x = 1.7a
    iii) tan = 39/14

    6 collisions horizontally:
    i) a: 8.33 m/s, b: 3.44 m/s, both in opposite direction to their original motion
    ii) e=0.654

    7 projectiles:
    i) 18.8m high, 61.1 m AB
    ii) 87.3 Ns
    iii) 11.9 m
    Pretty similar to what i got. 1i i got 35.8kw i think, agree with the rest apart from 6, where i got A: 5.5ms-¹ B: 8ms-¹ both changed direction, e=¾
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    (Original post by xsanda)
    Xsanda’s solutions:

    1) Car on a plane:
    i) v = 22.5 m/s
    ii) P = 35.9 kW

    2) Particle up a plane:
    i) Wd = 8.43 J
    ii) v = 10.8 m/s

    3 Arch shape:
    i) show that: 13a/3π
    ii) T = 8.82 N
    iii) θ = 10.9º left of upwards vertical

    4 Particle around a cone:
    i) show that m/6 (2 sqrt3 g - 3 a ω²)
    ii) T = 39.6N, V =1.19 m/s

    5 Ladder:
    i) show that 5W/24 (1+6x/a)
    ii) max x = 1.7a
    iii) tan = 39/14

    6 collisions horizontally:
    i) a: 8.33 m/s, b: 3.44 m/s, both in opposite direction to their original motion
    ii) e=0.654

    7 projectiles:
    i) 18.8m high, 61.1 m AB
    ii) 87.3 Ns
    iii) 11.9 m
    Same as you apart from the collisions
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    (Original post by TheNicholas)
    I got all the same as you apart from Q6 where I got 5.5 and 8 in reversed directions and 0.75 for e???
    I don't suppose you remember the question, do you? Was it
    A (4kg) 8m/s -> <- B (3kg) 10m/s,
    and what was the energy lost? 121.5?

    Energy before is 0.5*4*8² + 0.5 * 3 * 10² = 278
    Energy after is 156.5
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    (Original post by xsanda)
    I don't suppose you remember the question, do you? Was it
    A (4kg) 8m/s -> <- B (3kg) 10m/s,
    and what was the energy lost? 121.5?

    Energy before is 0.5*4*8² + 0.5 * 3 * 10² = 278
    Energy after is 156.5
    Yeah that's it, then equate 0.5*4*va^2+0.5*3*vb^2 and input a part from the collisions equation
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    Updated solutions, with the collisions correct:

    (Original post by xsanda)
    Xsanda’s solutions:

    1) Car on a plane:
    i) v = 22.5 m/s
    ii) P = 35.9 kW

    2) Particle up a plane:
    i) Wd = 8.43 J
    ii) v = 10.8 m/s

    3 Arch shape:
    i) show that: 13a/3π
    ii) T = 8.82 N
    iii) θ = 10.9º left of upwards vertical

    4 Particle around a cone:
    i) show that m/6 (2 sqrt3 g - 3 a ω²)
    ii) T = 39.6N, V =1.19 m/s

    5 Ladder:
    i) show that 5W/24 (1+6x/a)
    ii) max x = 1.7a
    iii) tan = 39/14

    6 collisions horizontally:
    i) a: 5.5 m/s, b: 8 m/s, both in opposite direction to their original motion
    ii) e=3/4

    7 projectiles:
    i) 18.8m high, 61.1 m AB
    ii) 87.3 Ns
    iii) 11.9 m
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    anyone remember what q2 was out of? and how did you do the impulse q
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    Does anyone remember how many marks you got for finding tan(a)
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    Completely run out of time for the last two questions. Absolutely devastated, was hoping to get 72/72 like I was in the past papers. But it was a very difficult paper, so I guess the boundaries will be low. What do people think 46/72 will get me? By the looks of past papers it would get me a B.
    I think;
    A*: 58 - 90 UMS
    A: 51 - 80 UMS
    B: 44 - 70 UMS
    C: 36 - 60 UMS
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    that was ****ing brutal, holy ****

    the jammy ***** in 2006/2007 had it so easy
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    This was mad hard! A violation of the geneva convention imo.
    I've been get 68-72 in all past papers but this... I didnt finish last question.
    I got e = 1/72 but i think thats wrong.
    The semicircular C.O.M. Question anyone: Were they wired arcs or a full on lamina? I never got the final answer :/


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    Hopefully 50 or lower for an A? I thought this was definitely on par with, perhaps harder than, June 2013 which was 50 for an A. I think the lowest boundary ever set for any OCR maths paper was 47/72 (excluding the rogue D1 paper with an impossible question) so it could even drop below 50? Not going to get too hopeful though.
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    It was far harder than both of the M2 OCR papers with an A boundary of 50/72 but they won't let it drop below that irrespective. It will be exactly 50 I reckon.

    (Original post by marioman)
    Hopefully 50 or lower for an A? I thought this was definitely on par with, perhaps harder than, June 2013 which was 50 for an A. I think the lowest boundary ever set for any OCR maths paper was 47/72 (excluding the rogue D1 paper with an impossible question) so it could even drop below 50? Not going to get too hopeful though.
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    Pretty sure grade boundaries are decided based on statistics so there's no reason it cant' be below 50 for an A. It would be ridiculous if someone at ocr didn't like the idea of sub 50 for an A so moved the boundaries.
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    Couldn't agree more that's how it's suppose to be done. But for example OCR F324 Chemistry June 2015, was in the news for being outrageously tough, that Cambridge chemistry undergrads couldn't tackle some of the questions. It was by far the hardest OCR paper ever and people were expecting 30/60 for an A but it was something like 44/60, most likely because it would be an embarrasment to OCR as an organisation to set a paper, that 50% would be enough to achieve an A. And it is usually around that for an A.

    (Original post by CuriosityKTMC)
    Pretty sure grade boundaries are decided based on statistics so there's no reason it cant' be below 50 for an A. It would be ridiculous if someone at ocr didn't like the idea of sub 50 for an A so moved the boundaries.
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    (Original post by Mathematicus65)
    Couldn't agree more that's how it's suppose to be done. But for example OCR F324 Chemistry June 2015, was in the news for being outrageously tough, that Cambridge chemistry undergrads couldn't tackle some of the questions. It was by far the hardest OCR paper ever and people were expecting 30/60 for an A but it was something like 44/60, most likely because it would be an embarrasment to OCR as an organisation to set a paper, that 50% would be enough to achieve an A. And it is usually around that for an A.
    I have done the F324 paper in question and think that its difficulty was exaggerated a lot, mostly by medicine offer holders who are naturally highly strung and forever panicking about meeting their offer. I doubt that any Cambridge undergrads would have had a problem with the actual questions, although it was very pressed for time.
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    Awful, awful paper
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    Guys... WHAT WAS THAT
 
 
 
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