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

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Time wasnt an issue for me i worked backwards as question 1 put me off. However q1 i think for the second part i may get 2/3 marks because i proved usinpheta is vertical component
then t=2xusinpheta/g then i used v=u+at some bs question XD

Yeah, i had no idea for the first 2 parts but i did solve the vertical components to get t=2usin(theta)/g.

Not a fan of OCR at the minute though, all the exams i've sat with them this year have been kinda like this one.

(edited 8 years ago)

Reply 1521

s081013

Original post by AlexParmenter

I read the last question so many times trying to figure out if the two tanks remain connected then I assumed it must just be flowing into the scuba tank because that's the purpose of mixing the gases to fill the scuba tank, so I used the original volume.

I also had a mind blank and couldn't think how to work out the number of moles of the helium so I worked out the number of molecules in each gas and added them together :colonhash:

for the number of moles in total, i got around eighty something - did anyone else get that too?

Reply 1522

Oraeng

Original post by FummyJr

Yeah, this is correct.
The forces are A) not of the same type and B) acting on the same object

Ah good, would I have got b) as that isn't exactly what I meant?

Reply 1523

chukster97

remember when q1 was supposed to be the easiest question >.>

Reply 1524

L'Evil Fish

Original post by frozo123

don't you need an A*? I'm sure you'll get it

Nope, can get them in Further Maths and Chemistry

However even if I did do badly in this, and got like a C, it'd still be okay for an A* because I'm going to do papers for before G485.

This exam I did a paper last week or more ago, but then nothing between then and the exam

Reply 1525

Maddog11

The question stated the gases mixed so the volume combine

Reply 1526

The Room Student

Original post by s081013

for the number of moles in total, i got around eighty something - did anyone else get that too?

Yep: 45 original + 41.07 helium?

Reply 1527

chem@uni

Original post by s081013

for the number of moles in total, i got around eighty something - did anyone else get that too?

86 I think

Posted from TSR Mobile

Reply 1528

s081013

Original post by The Room Student

Yep: 45 original + 41.07 helium?

yep

Reply 1529

s081013

Original post by chem@uni

86 I think

Posted from TSR Mobile

yeah i think i got that too :biggrin:

Reply 1530

FummyJr

Original post by Oraeng

Ah good, would I have got b) as that isn't exactly what I meant?

Ah, maybe not. Its because they act on different objects, the NCR is actually a force on the moon.

Reply 1531

chukster97

Original post by sagar448

First question don't know

Second was keplers which was easy...

Third propulsion one was easy

velocity graph thing was easy but I said the amplitude decreased and drew decreased amplitude but not decreasing over time.

messed up on the resonance graph (didn't come to mind)

rest was easy, you had to add the volumes at the end and the moles since i remember it clearly asking the pressure of the system!

what did people say for the why temperature increase wouldn't be like this in real?

so it was 45 add 45 for the moles?

Reply 1532

sagar448

Original post by chukster97

so it was 45 add 45 for the moles?

Yes

Reply 1533

Bjc00

Original post by chukster97

so it was 45 add 45 for the moles?

45+41.07

Reply 1534

SH0405

Original post by chukster97

so it was 45 add 45 for the moles?

45 + 41 = 86.

Reply 1535

s081013

for the describe how the acceleration changes over the course of 0ms to 10ms, i said that the rate of the increase of acceleration is constant from 0 to 3ms, then the rate of increase is reduced from 3 to 6ms, and from 6ms to 10ms, the acceleration decreased (which sounded really weird but i didn't really know how else to phrase it... oh well)

is that okay?

Reply 1536

chukster97