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

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Exactly what I got for all of them. However, for some, like the star mass I round to give 2.0x10^30. Is that acceptable or will I loose marks?

That's completely fine

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Reply 1381

Jmw123

Just gotta hope the grade boundaries are like 20 for an A :colondollar:

Reply 1382

TiiMMYz

Original post by randlemcmurphy

Anyone think the exam got easier as it went on?

I thought it started out really easy! :O It only started going downhill on Q1 i)

(edited 8 years ago)

Reply 1383

Jim997

Original post by a123a

I got all of these except the last one? I added the volumes and uses the previous pressure and volume of the He cylinder and did P1V1=P2V2. Is that method correct?

I don't think so cos the number of moles has increased. That assumes they are constant I think

Reply 1384

MMB07

Well, I finished in about 20 mins.........

Because I couldn't do half of the questions.

F**k you OCR. Better be like 30/60 for an A

Reply 1385

MathsAddict

Original post by L'Evil Fish

I didn't think mass would decrease because it was solar powered, so thought energy from sun converted into mass equivalent.

I've dropped 10 without even counting the mistakes :lol:

it was silly to count boxes typical of ocr tbh at least let us intergrate or something to find impulse.

Reply 1386

seizetoday

agree

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

Reply 1387

Elcor

Original post by a123a

I got all of these except the last one? I added the volumes and uses the previous pressure and volume of the He cylinder and did P1V1=P2V2. Is that method correct?

Wrote it wrong, edited now

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Reply 1388

Oraeng

What did people put for the describe the acceleration from the force/time graph? Got so confused :s-smilie:

Reply 1389

MathsAddict

Original post by examinationtsr

and heat lost to surrounding air.

Some photons may have been reflected

rate of photons emitted is another factor that may have not been what it was.

Reply 1390

alanconnel

For the one about show s=u2
i ended up with something like s= -2u^2sin(theta)cos(theta)/t ??

Reply 1391

Jim997

Original post by Elcor

That's completely fine

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Thank Christ haha. And instead of 1.27 I put 1.3 still fine? If not I think the procedure is to loose 1 mark and not be penalised again isn't it?

Reply 1392

ellisvlad

I put that heat is lost to surroubdings and that the energy conversion isn't fully efficient. Some goes to light and sound :s

Reply 1393

seizetoday

Original post by olil1996

I used both and ended up with about 1.5x10^7 Pa which I think is correct. The two containers are connected by a valve which is opened, connecting the containers and increasing the overall volume.

why did you add the two volumes together
it was metal so how could volume increase? just wondering

Reply 1394

examinationtsr

Original post by MrChemKid

Planets mass- something x 10^30?

Around that

Reply 1395

Nuvertion

Does anyone know how many marks the first two questions were worth?

Reply 1396

ImLiterally12

How did everyone find the first question? I thought it was pretty horrible. Paper seemed to get easier as it went on though.

For the last gas question, did anyone else have the total moles of air to be 81 and added the volume of the 2 containers together?

Reply 1397

MathsAddict

I didnt add the volumes poor me XD should have saw the trick in that question but nevertheless i managed everything else.

Reply 1398

fatart123

For the oscillating object that has its frequency slowly increased, does the amplitude remain the same and the only change as f increases it that the graph gets squashed together?

Reply 1399

TommyCooper97

Original post by Red Fox

How did the acceleration change if the engine was left running?

For the spaceship? I put that as the Xenon ions were fired out the total mass would decrease and acceleration is proportional to one over mass so the acceleration would decrease as the mass decreases.