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The Physics PHYA2 thread! 5th June 2013 watch

  • View Poll Results: What mark do you think you got out of 70?
    0-20
    6
    2.99%
    21-40
    12
    5.97%
    41-50
    29
    14.43%
    51-60
    80
    39.80%
    61-70
    74
    36.82%

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    (Original post by sausage360)
    Why do you "need" full ums? What is it that you need it for?
    I needful UMS because I worked soo hard for it. Did a lot of revision so I was expecting full ums.
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    For the spring constant i got 1150N.m-1 so i put 1200N.m-1 because of 2 sig fig, would that be correct?
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    (Original post by lebron_23)
    I can't remember them giving us the velocity of the aircraft, or am I just being stupid? I used Fs\cos \theta to work out the work done and then figured out the power. I have no idea what I did on that question.. :rolleyes:
    It didn't, but it gave you a distance and the time. So v=s/t. Which was 300/55 in this case I think. In all honesty, it is one of the few questions I am quite worried about losing marks on.
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    For 1b did you guys do arctan1/6 to get the direction of motion was 9.something degrees to the horizontal?
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    (Original post by nich01as)
    Btw, any thoughts on the 100% ums mark? The mean of previous years in 60, with 57 being the lowest, 69 being the highest, and 62 being the second highest. Any thoughts? Harder than normal, easier? Thanks.
    Somewhere between 60-65 I think. There were some places to slip up but the people who really got the paper won't have dropped many. Thought the paper was pretty nice, not as nice as the Unit 1 of this period though. Beautiful first paper to have.

    (Original post by Bookaky)
    For the graph about the ball and the oil I think it is debatable. Surely the ball would continue to accelerate in the oil for only a short period of time and then level off for terminal velocity?
    I did think this and really it depends on the thickness of the oil and stuff so it's not a nice question. But I think what they were looking for was for you to show a decrease in velocity when it hits and then it moving at a constant V. But you may well get marks for it because it wasn't a very well written question.

    (Original post by Steroidsman123)
    Yes the photon energy decreases, but light intensity is the number of photons arriving at a point per second. Remember the photoelectric effect? Increasing the intensity increases the number of photon emitted per second as more photons are arriving per second. The energy of the photon just dictates the kinetic energy of the photos. Thus, the same number of photons of red and blue light arrive per second regardless of their energies. Thus the intensities are equal regardless.
    Difficult question because the red light does diffract more and so it covers a greater area which is why I put it as having a lower intensity. But I'm not sure.
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    (Original post by IWantSomeMushu)
    For 1b did you guys do arctan1/6 to get the direction of motion was 9.something degrees to the horizontal?
    yes!
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    (Original post by StalkeR47)
    I needful UMS because I worked soo hard for it. Did a lot of revision so I was expecting full ums.
    Same boat here. And I think I've lost up to 6 or 7 marks.
    Guesses on how many ums I'll get?


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    (Original post by IWantSomeMushu)
    For 1b did you guys do arctan1/6 to get the direction of motion was 9.something degrees to the horizontal?
    Yeah, that is exactly what I did, 9.2 degrees I think.
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    (Original post by IWantSomeMushu)
    For 1b did you guys do arctan1/6 to get the direction of motion was 9.something degrees to the horizontal?
    I got 9.2 I think.
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    (Original post by StalkeR47)
    Yeah. First question (mechanics) was a tricky question. In fact, most questions in this paper were tricky. So, what do you think you got in this paper (roughly)?
    Maybe 49-53 marks, for finding the weight of the ball in question 2, i didn't realise that there was the formula on the data sheet, as I had like 2 minutes left I just made a number up for the volume then found the mass and the the weight my W=mg, how many marks would i get?


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    The 6-markers for both Unit 1 and 2 were easy this year. I wonder what AQA were thinking.
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    Not sure what everyone's talking about because that was the easiest paper I've ever done. Probs lost 1 mark and that's being harsh on myself. Only need a C for an A* anyway. Cambridge here I come!!!! Who's joining me?


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    (Original post by IWantSomeMushu)
    The 6-markers for both Unit 1 and 2 were easy this year. I wonder what AQA were thinking.
    I did all the past papers and I think they were both probably the easiest they've ever given. So I'd expect to see the grade boundaries go up at least 2 marks on each just because of that.
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    (Original post by Jimmy20002012)
    Maybe 49-53 marks, for finding the weight of the ball in question 2, i didn't realise that there was the formula on the data sheet, as I had like 2 minutes left I just made a number up for the volume then found the mass and the the weight my W=mg, how many marks would i get?


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    I think you will get 2/4 marks.
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    (Original post by february-girl)
    Not sure what everyone's talking about because that was the easiest paper I've ever done. Probs lost 1 mark and that's being harsh on myself. Only need a C for an A* anyway. Cambridge here I come!!!! Who's joining me?


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    So you're a resit student then? How did Cambridge feel about that because I'm thinking of applying but may need a couple of resits.
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    (Original post by NedStark)
    Ahh FML, well that was a stupid mistake. Hoping they won't cap me at 2 marks or something for that.
    It would be very harsh to cap you any marks at all for that!
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    (Original post by IWantSomeMushu)
    So you're a resit student then? How did Cambridge feel about that because I'm thinking of applying but may need a couple of resits.
    They don't mind resits if its only a unit or two and you improve
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    (Original post by IWantSomeMushu)
    So you're a resit student then? How did Cambridge feel about that because I'm thinking of applying but may need a couple of resits.
    Yes I am indeed but only for the aim to get full marks. Yeah I'd recommend it, not exactly hard to get into if you think about it. Plus they've lowered the grade boundaries for me


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    (Original post by february-girl)
    Yes I am indeed but only for the aim to get full marks. Yeah I'd recommend it, not exactly hard to get into if you think about it. Plus they've lowered the grade boundaries for me


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    What are you doing at Cambridge?
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    (Original post by february-girl)
    Yes I am indeed but only for the aim to get full marks. Yeah I'd recommend it, not exactly hard to get into if you think about it. Plus they've lowered the grade boundaries for me


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    They get something like 15 applications per place, it is actually very hard to get into it.
 
 
 
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