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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
    3.00%
    21-40
    12
    6.00%
    41-50
    29
    14.50%
    51-60
    79
    39.50%
    61-70
    74
    37.00%

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    (Original post by Davelittle)
    I got 1.05J
    i got 1.06J
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    (Original post by Davelittle)
    What are you doing at Cambridge?
    Guess?


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    (Original post by jonny7bell)
    They get something like 15 applications per place, it is actually very hard to get into it.
    Exaggeration? :P Natural Sciences (Which I'm applying for) has 4 per place.
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    6100N
    9.5degrees
    Acceleration
    Ep
    Power efficiency 20.4


    Question2:
    0.55s
    245m ish as square route of 2y/g
    S=Vt so if V is lower S is lower acceleration is equal for both across same distance therefore same vertical downwards time however lower horizontal velocity in b means lower distance as S=Vt


    Question3:
    volume of sphere equation density over volume value is 0.44n weight
    The ball in oil including newtons first and second law terminal velocity resultant forces and gravity vs drag to create curve of velocity followed by horizontal etc(6 marks)
    Then graph- straight line until it goes in then curve to decreasing gradient until gradient=0 and stays constant


    Question4:
    Hookes law
    Gradient for k (1100 N/m ish
    Area under- 1/2F x delta l can't remember value
    Straight line parallel to first one intersecting x axis
    plasticity definition (look it up)
    Work is less as area under graph is less energy absorbed as heat and in permanent extension


    Question5:


    Two conditions for TIR? Higher than critical angle, and moving from a higher n to lower n.


    Speed of light = 1.7*10^8


    Angle =30 degrees


    Critical angle = 51 degrees


    What happens to the ray of light? Undergoes TIR since angle of incidence = 52 degrees > critical angle


    Draw light reflecting off thanks to flf


    Question6: Progressive wave one
    1/2pi and 3/2 pi
    Describe motion of B (up then down then down then up)
    Transverse so seismic Secondary wave oscillations perpendicular to energy transfer, many oscillation planes turned to one therefore must transverse
    Define frequency
    Wavelength c=wavelength x frequency therefore answer forgotten values


    Question7:
    Definition of monochromatic
    Fringes larger intensity equal
    Forgot
    White light fringes vs monochromatic fringes red outside fringes blue light inside white central colours diffract at different angles therefore overlapping etC (This was white light from a single slit!)
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    (Original post by jonny7bell)
    They get something like 15 applications per place, it is actually very hard to get into it.
    Things change when you sleep with admissions tutor


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    (Original post by nich01as)
    Exaggeration? :P Natural Sciences (Which I'm applying for) has 4 per place.
    NatSci is 8 per place.... More at the better colleges for science
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    (Original post by OliverG)
    For question 2 (or 3, can't remember) with the efficiency, if I did the right method but got part a) wrong, thus getting part b) and c) wrong, would I only lose marks for the first part?
    They'll deduct a mark from every question the paper for being a fool leaving you with no higher than a D.

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    I would thumbs you down but I've reached my limit for today.

    (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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    (Original post by Felix Ivers)
    Thats true. What would be great is a 6 marker stating and explaining newtons laws (1 mark for stating 1 for explaining each). They've shown that they'll put any topic in the 6 markers like in unit 1, so you never know!

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    Just to say, basically predicted the 6 marker, psychic over here.

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    (Original post by IWantSomeMushu)
    I'm wondering why the boundaries are so low for this unit. Surely most people doing Physics will also be doing Maths with mechanics?
    Yeah, but at my school we do S1 instead of M1.
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    (Original post by february-girl)
    Guess?


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    PHYSICS?
    • Thread Starter
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    (Original post by Davelittle)
    PHYSICS?
    Cambridge don't have a course for just physics
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    (Original post by Goods)
    NatSci is 8 per place.... More at the better colleges for science
    On the website it says 4 applications per place
    • Thread Starter
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    Guys how did you find the exam?

    I've created a poll, hopefully it might give an idea of the grade boundaries?
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    (Original post by .raiden.)
    Cambridge don't have a course for just physics
    NatSci then picky
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    (Original post by waheed786)
    I would thumbs you down but I've reached my limit for today.
    Don't cry because I've increased the grade boundaries for you fella. Should have got your head down and revised :-)


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    what was the wavelength question for which the answer was 750m ?? does anyone remember? thanks!
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    Ohh trust me you haven't it just seems like you're being a bit full of yourself, you sound like one of them posh school kids , whom I hate so very much. And I've been putting my head down hope full marks is round 60.

    (Original post by february-girl)
    Don't cry because I've increased the grade boundaries for you fella. Should have got your head down and revised :-)


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    You know for calculations I think I might of forgot to put one answer in the space provided will you still get the marks as you got the correct answer but not on the line?

    Also I got the work done by finding the number of squares and times by the area per square?
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    (Original post by waheed786)
    what was the wavelength question for which the answer was 750m ?? does anyone remember? thanks!
    Frequency was 6.0 HZ

    Speed was 4.5x10^3

    lambda=c/f=4.5x10^3/6.0=750m
 
 
 
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