Ocr A Ffe And Unifying Concepts Watch

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gangstarr
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#1
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ok .... just me or ...

was unifying concepts stupidly hard !
- what was the shiny shoe on about


FFE was ok
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GolferPar
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Taht was a pretty complex paper to say the least! I reckon the grade boundaries will be fairly low! What was the mass on the bob question about as well?
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gangstarr
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i put something to do with a gravity wheel.

at top weight = T + MG . im not sure this was correct ! what was the shoe thing ?!??!

and do you remeber any numericals on uc paper to do with that god awful circuit .
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MichaelJWilliams
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I think the answer to the shoe question was about polish. I guess when you polish a shoe you leave a film of (dried) polish over it, so although the black leather absorbs all incident light, the polish reflects light that hits it at certain angles (i.e. above the critical angle for the air/polish interface).
I had a bit of luck with that one - while I was scratching my head over it, my old German teacher walked into the exam room, and he's from Poland...
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gangstarr
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what other answers u get ?
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MichaelJWilliams
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I think my answers for the currents were 3A and 6A, but electricity was never my best subject and that generator threw me
I got the half-life of Y to be 72 hours
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Asian cutie
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i hated the synoptic i think i got about 9/60 i got current at 6a
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leigh6387
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i put angle of incidence is greater than cirtical angle for shoe polish, X-ray do not diffract because gap is too large, for the currents 24A in teh generator, 3A in one headlight, and 72W for the power, i spent 30mins on the last question about activity just couldnt do it!! A is proportional to r^2, sound waves cannot be polarised because they are longitudinal, fire and high winds due to hot air rising and cold air filling the space left.
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RDoh
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I think I did pretty badly on both papers.

For the half-life of Y I got 60 hours (using a graph).

For the generator question, I wasn't sure which e.m.f's applied to which question (12,16 or both). I got 288W as one of the answers.
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sarah12345
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wtf was that exam bout!! it was weird
i got 72 w but the half life thing i did a calulation and got diff values dependin on which points i chose i got 77h in the end
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leigh6387
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i took a random guess at the half life 56hrs ha!!!! crazy
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lipsticktraces
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i got 57 for the half life using my grap

what did people put for what is happening to the battery, and why does the genteator have to be higher emf than the battery? :confused:
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leigh6387
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the battery is charging up, and the generator has a higher emf to charge the battery
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lipsticktraces
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cheers exactly what i put
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ollster
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I cant believe I did a paper talking about shoes. I think the synoptic is a dumb ass idea. Maybe I am saying that because I aint very good at them but I don't see the point when it is asking things which are never taught at A Level.

FFE was very easy and it was a real shock to then do the synoptic. I am glad our centre messed up and gave us an extra 15 mins lol
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Asian cutie
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did everyone get a curve for the graph in the synoptic?i didnt but then again my balues were made up so hopefully i might get a ecf mark. also for the moles calculation in ffe did anyone get a really big number starting with 5....?
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ollster
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I got a straight line with a half life of 56.
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idiopathic
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Lol the graph was crap - it was more like a straight line. So I decided to use calculation instead and got 77 or something, using data of t=0 and t=6.

There were some really dodgy questions I thought - E.g. the one about, "explain how a refrigerator does not cool a kitchen when its door is open." - I didn't know whether they meant literally (but surely it does cool its surroundings to thermal equilibrium??) or whether they meant "cool it by a significant amount" (i.e. any cooling is negligible).
The penultimate {and last part to some extent} of q. 4 (radioactivity) was pretty dodgy too..
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sarah12345
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for the last question on ffe how would u work out the energy of the radiation? also for the first question how did u work out the final speed?
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GolferPar
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The initial current was 8A due to there being internal resistance
V = E - Ir

For the refridgerator question I wrote about negligible cooling of the kitchen due to the extremely large volume. For the shoe question the polish route is definitely correct.

The main question that stumped me was why you couldn't work out a half life for the mixture? I wrote about one inhibiting the other from decaying. As X was decaying so much more rapidly nuclide Y could surround the X nuclide thus preventing it decaying!!!

The bob question could have been to do with fluctuations with the Earth's magnetic field or fluid resistance! Not a clue really, made it up as I went along!

How how do you reckon the grade boundaries will be?
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