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

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Reply 1360

a123a

Original post by FummyJr

1) some heat lost
2) some photons reflect off the metals surface and are not absorbed

Yeah I put this.

Reply 1361

MrChemKid

Planets mass- something x 10^30?

Reply 1362

fatart123

OCR: What kind of exam do you want?
Me: Just **** my **** up

Seriously though, last questions weren't too bad tbh. Did anybody get something x 10^30 for the mass of the planet with that graph question? What reasons did you guys put down for 1a)? I said that g isn't 9.81 or something and that the gravitational attraction towards the Earth causes a third force to come into play.

(edited 8 years ago)

Reply 1363

a123a

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.

Could you please explain how you got to that answer?

Reply 1364

randlemcmurphy

Anyone think the exam got easier as it went on?

Reply 1365

FummyJr

Original post by MrChemKid

Planets mass- something x 10^30?

It was a stars mass, but yes.

Reply 1366

Red Fox

Original post by MrChemKid

Planets mass- something x 10^30?

Wasn't it a star, not a planet? But yeah I got something x 10^30.

Reply 1367

Jim997

Original post by MrChemKid

Planets mass- something x 10^30?

Yeah!

Reply 1368

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

(edited 8 years ago)

Reply 1369

examinationtsr

Original post by seizetoday

I got 356 seconds :s

Yeah it was a small number

Reply 1370

TiiMMYz

I used to have dreams and aspirations... then I opened the g484 paper

Reply 1371

SkilledNChilled

Why are OCR making the papers so difficult this year? Couldn't even do questions 1 and 2 because of vague diagrams. I didn't even think that the mass of xenon would decrease because of exam pressure :frown:

Reply 1372

TeeCe

Original post by a123a

Yeah I put this.

I wrote my two points on convection, radiation and conductiom :/

Reply 1373

a123a

Original post by MrChemKid

Planets mass- something x 10^30?

Yeah, I think 1.97*10^30?

Reply 1374

Ebm7

I wrote that the laser is only aimed at a small part of the volume so the metal isn't being heated evenly, not sure whether thatll get the mark or not

Reply 1375

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:

Reply 1376

Jim997

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 = 1.5x10^5

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?

Reply 1377

MathsAddict

First question was awkward but nevertheless alright paper i guess? I hope my reasoning points are correct i did every question to do with calculation.

Reply 1378

a123a

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 = 1.5x10^5

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?