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    Phy 4 was quite challenging this time... I had done a lot of Past Papers, but I never found many of the questions that appeared in today's paper..
    Looks like marking scheme will be low this time around!!!!!?
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    I agree, the PHY 4 had many strange questions, the spider stationary wave, the force on the girl thing (I simply did F=mg, althought some classmates did F=mg+mrw^2).
    Whereas the PHY5 was more straighfoward.
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    I dunno about harder...but definitely felt better about phy5...its shorter!

    I acttually hadn't done any past papers, had never seen a past paper for phy5 :eek:

    the spider web question was quite nice
    and I don't remebr this force on a girl thing :confused:
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    on question 1, centralpetal force in order to keep a girl in orbit, given 6400 km and 60 kg
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    phy4 got me too, i got stuck out with the question about the pendulum ..the whole question...maybe cos i've forgotten my free body forces and haven't done mechanics in ages.
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    for the pedulum I got mgsin4 as the acceleration towards O
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    Ph4 was horrible, the pendulum was the most confusing thing. For the resultant force thing on Q1 i got like 589N. Everyone in my school found it hard.
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    By the way, what was the source for Gamma and Infrared Radiations in Q 2???? For Gamma, I wrote Earth surface (blind guess)... For IR, was it television romote, mobile phones etc..????
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    Gamma comes from radioactive decay, Infared from the cosmics.
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    well ,i think i am gonna fail in physics...
    i got A in AS, but this time, hope i can get B overall...
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    ye i found phy4 really hard as well but all my friends at skool sed it was really straight forward. in the text book for infa red it says cosmic and really hot objects and gamma is radioactive decay. for the first qu i got 2.03 for the circular motion qu and 588 for the reading on the scales. i didnt understand why it was worth 3 marks tho. wot other questions were there?! i didnt like the pendulum question either,.....i didnt understand wot instantaneous acceleration was. i got a bit confused. o in phy5 i remember the qu i got stuck on..... it was about weight and height and sed wot assumption do u hav to make and explain!? any ideas?
    Sarah xxxx
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    the exam was really tough and it had many tricks in it for example in question 1c the calibrated reading would be the reaction of the gurl mg-R=mrW^2
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    hopefully the grade boundaries get really low then
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    ...anyone got a copy of the exam papers???

    1) grade boundaries are usually quite hight in physics- if you found it hard, worry, cos you can be sure they'll be some ppl out there who loved it

    2)in the satellite height/weight question...I said that the assumption thats made is that the same amount of grav force is working on the satellite...not sure if its right

    3) IR radiation- I wrote EXTREMELY hot objects, cos visible light was -"hot objects"
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    (Original post by Valerio)
    for the pedulum I got mgsin4 as the acceleration towards O
    ... I put 9.81cos4 wasnt it like the normal reaction force when doing mechanics???
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    It was gsin4. When you think about it this is clear since from the size of the angle you can see it's only a tiny component of the force acting towards the equilibrium point. gcos4 is virtually equal to g.
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    (Original post by Spenceman_)
    It was gsin4. When you think about it this is clear since from the size of the angle you can see it's only a tiny component of the force acting towards the equilibrium point. gcos4 is virtually equal to g.
    that's what it has to be... isnt it?? It has to be almost equal to g... because... well... it's almost vertical... isnt it? so when it's completely vertical it's g... when it's just turned 4º it must nearly be g...
 
 
 
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