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

I think that was my mock in January actually
Was that the one about air pressure in mountains? Lol
Revision good
F324: consistent (I've done about 5 papers)
F325: consistent (done 4 I think)
G484: consistent (done a few)
G485: only done 2 but both 90+
French... Haven't done anything, gonna fail but that's fine, can get an e in paper and still get a I think overall
Maths, got A*s in the mocks we did so should be fine!
I might try for French but it's same day as f325 so meh

Yes got a fair bit of that last question right apart from that damn question.
Nice so you got round to those essay questions then :smug:

So how many a levels will you have by then end 6?

On a side related note did candidates get an extra week to revise, from this two week gap of half term coming up?

Wasn't it only one last year.

Reply 261

sagar448

4

Original post by Damien_Dalgaard

which paper you looking at?

g484 specimen was cake.

g484 june 2014 was difficult mainly just last question but it is what it is srs

Lol for me the june 2014 was cake and the specimen was not VERY hard I mean comparing the grade boundaries still would've A/A*ed it but still kind of tricky.

Now the G485 was quite difficult, the specimen paper, try it. The june 2014 G485 is very straightforward just need to remember the little details. :biggrin:

Reply 262

whyalwaysme??

2

Also do you guys know any other positive use for resonance other then MRI and Microwave?

Reply 263

L'Evil Fish

OP

18

Original post by Damien_Dalgaard

Yes got a fair bit of that last question right apart from that damn question.
Nice so you got round to those essay questions then :smug:

So how many a levels will you have by then end 6?

On a side related note did candidates get an extra week to revise, from this two week gap of half term coming up?

Wasn't it only one last year.

Yeah lol, did an 8 marker on mri

Was gross

Only the 5

Original post by whyalwaysme??

Also do you guys know any other positive use for resonance other then MRI and Microwave?

Urmm

Ultrasound? The alternating voltage applied across the piezoelectric crystal has a frequency matching that of the the natural frequent of the crystal causing resonance so it produces pulses Ultrasound

Maybe?

Reply 264

Makashima

16

Done my unit 1 resit, did messed up in some question but now fully concentrating on Physics A2 ^_^

Reply 265

Damien_Dalgaard

16

Original post by sagar448

Lol for me the june 2014 was cake and the specimen was not VERY hard I mean comparing the grade boundaries still would've A/A*ed it but still kind of tricky.

Now the G485 was quite difficult, the specimen paper, try it. The june 2014 G485 is very straightforward just need to remember the little details. :biggrin:

I suppose so yes.

Soon as we have done the phy exams, every peasent on here gonna be whinging how they have had the hardest paper, you heards it here first.

Yes the specimen g485 was in some places tricky, I thought the june 2014 was different in the sense that the longer essay questions didn't come up hardly. I mean one g485 paper has 33 marks dedicated to medical physics questions, lolek.

Original post by L'Evil Fish

Yeah lol, did an 8 marker on mri

Was gross

Only the 5

Urmm

Ultrasound? The alternating voltage applied across the piezoelectric crystal has a frequency matching that of the the natural frequent of the crystal causing resonance so it produces pulses Ultrasound

Maybe?

ggwp cu@CAT scans

Reply 266

whyalwaysme??

2

Original post by L'Evil Fish

Yeah lol, did an 8 marker on mri

Was gross

Only the 5

Urmm

Ultrasound? The alternating voltage applied across the piezoelectric crystal has a frequency matching that of the the natural frequent of the crystal causing resonance so it produces pulses Ultrasound

Maybe?

Nice I see, thanks, could you help me with Jan 2011 question 3c)? No idea how to do it

Reply 267

sagar448

4

Original post by whyalwaysme??

Nice I see, thanks, could you help me with Jan 2011 question 3c)? No idea how to do it

line from 18 at y-axis and 0 at axis to x-axis with negative gradient. Then 0 gradient flat for a few seconds on X-axis then even steeper line from the x-axis to -18.

This is because When it's cooling from 18 degrees it takes longer so the rate of cooling is higher than when it's cooling from 0 degrees. So thats why steeper line blow x-axis

(edited 8 years ago)

Reply 268

Elcor

14

Original post by whyalwaysme??

Also do you guys know any other positive use for resonance other then MRI and Microwave?

The current in a radio resonates at the same frequency of the detected radio waves.

Reply 269

whyalwaysme??

2

Original post by sagar448

line from 18 at y-axis and 0 at axis to x-axis with negative gradient. Then 0 gradient flat for a few seconds on X-axis then even steeper line from the x-axis to -18.

This is because When it's cooling from 18 degrees it takes longer so the rate of cooling is higher than when it's cooling from 0 degrees. So thats why steeper line blow x-axis

Oh wow thanks a lot for the help man, I get it now.

Original post by Elcor

The current in a radio resonates at the same frequency of the detected radio waves.

Nice that's interesting haven't heard that one before will definitely look it up.

Reply 270

sagar448

4

Original post by whyalwaysme??

Oh wow thanks a lot for the help man, I get it now.

No problem. :smile:

Reply 271

whyalwaysme??

2

Hey guys, does anybody know why the Past papers from 2012 allow 1h 15 mins instead of 1h? Is it because they made the papers longer or they thought we needed more time? Didn't really feel much difference in the length, anyways just asking.

Reply 272

randlemcmurphy

11

Original post by whyalwaysme??

Hey guys, does anybody know why the Past papers from 2012 allow 1h 15 mins instead of 1h? Is it because they made the papers longer or they thought we needed more time? Didn't really feel much difference in the length, anyways just asking.

They felt as if we needed more time to think over the questions.

Reply 273

imfrassin

2

pg50 q2b
im stuck on this question from the text book.
I got so far:
SoGMmoon/R2 = GMearth/R2

G's cancel out but how do i use the fact "has travelled to a point of 0.9 of the distance between their centres"

help appreciated :smile:

Reply 274

chem@uni

9

Original post by imfrassin

pg50 q2b
im stuck on this question from the text book.
I got so far:
SoGMmoon/R2 = GMearth/R2

G's cancel out but how do i use the fact "has travelled to a point of 0.9 of the distance between their centres"

help appreciated :smile:

upload a picture of the question

Reply 275

imfrassin

2

Original post by chem@uni

upload a picture of the question

there you go fam

Original post by imfrassin

there you go fam

I think what you can do is create two equations where in one "r" is equal to the distance from the point to the moon and in the second equation "r" is equal to the distance from the point to the earth.

Equation being F = GMm/(r^2)

Then set them both equal since they both equal to 0 and just solve for one of the "M"s.

Good luck :biggrin:

Reply 277

imfrassin

2

Original post by sagar448

I think what you can do is create two equations where in one "r" is equal to the distance from the point to the moon and in the second equation "r" is equal to the distance from the point to the earth.

Equation being F = GMm/(r^2)

Then set them both equal since they both equal to 0 and just solve for one of the "M"s.

Good luck :biggrin:

How can I when the distance or mass of the moon hasn't been given?

Also what's the best way of defining phase difference? Anyone know what they're looking for on a mark scheme haven't started papers yet, just finishing off notes.

I defined it as 'the angle in radians between subsequent wave peaks' I think that's a bit vague tho