nirishmedic
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Anyone else doing this exam on Thursday?
What are your predictions and how are you preparing?
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rachael_nc
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Yes I'm doing it tomorrow! I'm hoping its on oscillations and electrical circuit but I have no clue for question 3 😦
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nirishmedic
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(Original post by rachael_nc)
Yes I'm doing it tomorrow! I'm hoping its on oscillations and electrical circuit but I have no clue for question 3 😦
Lenses and capacitors haven't come up for a while!
Good luck!


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yash.b97
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Who's done the electrical circuit task? I need help
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nirishmedic
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Thoughts on today?


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kitkat1498
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Overall not too bad.. was a little unsure of the uncertainty question for the electrical circuit q though
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kitkat1498
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What range did you get for values of Ln0, and uncertainty?
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nhealy1
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(Original post by kitkat1498)
Exp 1 - measuring the angle between two suspended spings attatched to a mass, and the length of each as the masses increased.
Exp 2 - LDR - measuring the current, when placing a glass plate on top of the LDR (under a light source) until 5 glass plates were on top.
Lots of uncertainty questions.
3. 9 mark planning and design (ball bearing in a bowl - oscillations)
what sort of questions come up in the part 3 planning and design,, anything hard we need to be made aware of.... the part 3 is always a struggle for me
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mike_gawa
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Does anyone know that is doing this exam tomorrow do CCEA change the conntet much of this exam or is it the exact same as the one today?
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Jaccckkk
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(Original post by kitkat1498)
Overall not too bad.. was a little unsure of the uncertainty question for the electrical circuit q though
19.61mA and +-0.27mA, what did you get?
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skye_eve
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How did everyone find the a21 exam today?
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kitkat1498
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I didn't like the circular motion question. What points did you choose as most and least? And what did you get the nuclear density to be? Does anyone have a rough mark scheme?
(Original post by skye_eve)
How did everyone find the a21 exam today?
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jackpcraig
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(Original post by kitkat1498)
I didn't like the circular motion question. What points did you choose as most and least? And what did you get the nuclear density to be? Does anyone have a rough mark scheme?
I didn't like the circular motion either. The nuclear density is 2.3*10^17
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skye_eve
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Circular motion was horrible. I put B for most and A for least what about everyone else?
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kitkat1498
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I thought the momentum question was fairly easy. Can't remember them all (feel free to fill in the gaps)
1)momentum of the 120kg rugby player
-P=MV =(120)(28.8×10^3÷3600)
2)final v =3.45
3) with second player, stopping force doubles, hence V is halved?
Circular motion question
-Really not sure here to be honest. Said that max deformation occured at C (bottom point) and minimum at B? (Although I think now that it was A).
Simple Harmonic - a=w^2x, where w=2pi/T
A at fixed point =0
(Can't remember next one)
Nuclear density - 3m/4 pi Ro^3 using data given in question. For some reason I got it to be 4.5 or something.
Speed of the neutron anybody?
Mass defect worked out to give 28.8 MeV I think.
E=MC^2 where E=energy, mass defect, and light in a vccuum.
Basic description of boyle's law experiment.
For the tyre question, P1/T1 =P2/T2, got secondary pressure to be 1059Kpa I think.
Basic description of protactinium expt with GM tube.
Angular velocity of the gymnast?
For the alpha decay, subtracted 4 from mass number and 2 from atomic number to calculate 75 proton and 80-something neutrons. DT reaction stuff was good I thought. JET fusion question?
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