OCR Physics A G484 - The Newtonian World - 11th June 2015 Watch

Bjc00
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#1441
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#1441
(Original post by Elcor)
Some answers I got:

Ion mass = 2.18x10 ^-25
Initial acc = 1.27x10^-5
Satellite velocity =0.061
Star mass = 1.97x10^30
Time was something in millisecond
Pressure = 1.5x10^7
Agree with that time was 2.1x10-3 i think
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The Room Student
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#1442
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#1442
Judging by people's answers, other than the very first part, I'm feeling quite good about it now.

Any idea why they've stopped putting the 'Total Marks' at the end of each question this year?
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MathsAddict
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#1443
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#1443
(Original post by Elcor)
Only mark I'm certain I've lost is the amplitude and acceleration of the SHM metal, I didn't see the velocity was in 0.1ms^-1. Should only lose one due to ecf.

Ask me if you want to know what I put for specific questions. Definitely lost like 10 somehow throughout the paper though.
i underestimated that question too tbh i hope i get a medium B so i can smash g485 i know this mark scheme will be full of bs
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Devran22
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#1444
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#1444
(Original post by examinationtsr)
Because it was the pressure for the whole system,
Swear it was pressure for tank only?? If not f*** I was going to do that then thought it was tank only

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Elcor
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#1445
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#1445
(Original post by gothmog827)
first graph: negative constant gradient through origin
second: still sinusoidal but decrease in amplitude and slight increase in time period (not sure if this second point is necessary)
third: basic resonance graph, with peak at 8Hz
For the second the period is constant but the amplitude decreases over time

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heetz_96
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#1446
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#1446
(Original post by DoctorDren;[url="tel:56877641")
56877641[/url]]Doesn't volume after the added moles stay constant for the last question?
Volume does add up since the temperature was constant
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seizetoday
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#1447
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#1447
(Original post by JayGreen)
yeah I think if we're all finding it that rubbish then they probably will be quite low this year
yeah shoul be about same
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Flux_Dubstep
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#1448
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#1448
Thank the lord for ECF marks all I can say

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Jamie0
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#1449
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#1449
For anyone who's watching who hasn't sat it, this is the question that stumped everyone

http://cdn.index.hm/f/k1kX0TYzZDY4Mz...484JUN2015.pdf

(Note: it's obviously satire)
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seizetoday
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#1450
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#1450
(Original post by DoctorDren)
Doesn't volume after the added moles stay constant for the last question?
Thats what i thought but we probably misread


(Original post by examinationtsr)
Because it was the pressure for the whole system,
If this is true then i misread
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randlemcmurphy
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#1451
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#1451
(Original post by sagar448)
I think i lost about 15 marks but i think this was so much harder than last years so do you think grade boundaris will be low??


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My view: I think Q1 will have put so many people off. Question 1 and 2 got me really worried, however from 3 onwards it went well.
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a123a
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#1452
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#1452
Hopefully I got into the low 50s.
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Lousamnap
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#1453
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#1453
Was it just me or was that difficult??
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examinationtsr
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#1454
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#1454
(Original post by MathsAddict)
rate of photons emitted is another factor that may have not been what it was.
same thing for this specific q/
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gothmog827
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#1455
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#1455
(Original post by Elcor)
For the second the period is constant but the amplitude decreases over time

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won't the time period increase slightly?
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Elcor
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#1456
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#1456
(Original post by Devran22)
Swear it was pressure for tank only?? If not f*** I was going to do that then thought it was tank only

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Pressure is the same for just the tank and the whole system...

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Gallax
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#1457
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#1457
Are there ECF marks? For a three marker, if I made a calculator error for one of the M1's then would I lose 2 marks or 1?
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Bjc00
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#1458
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#1458
for first question did anyone talk about gravitational field of the equipment? every mass has a field right?
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FummyJr
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#1459
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#1459
(Original post by alanconnel)
oh yeah i think i got that but for a i put 9.81
It was on the moon, so a isnt 9.8 :erm:
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examinationtsr
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#1460
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#1460
(Original post by Devran22)
Swear it was pressure for tank only?? If not f*** I was going to do that then thought it was tank only

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To be honest I can't remember either. Anyone else?
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