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

a123a
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#1361
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#1361
(Original post by FummyJr)
1) some heat lost
2) some photons reflect off the metals surface and are not absorbed
Yeah I put this.
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MrChemKid
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#1362
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#1362
Planets mass- something x 10^30?
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fatart123
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#1363
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#1363
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.
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a123a
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#1364
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#1364
(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?
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randlemcmurphy
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#1365
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#1365
Anyone think the exam got easier as it went on?
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FummyJr
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#1366
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#1366
(Original post by MrChemKid)
Planets mass- something x 10^30?
It was a stars mass, but yes.
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Red Fox
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#1367
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#1367
(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.
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Jim997
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#1368
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#1368
(Original post by MrChemKid)
Planets mass- something x 10^30?
Yeah!
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Elcor
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#1369
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#1369
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
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examinationtsr
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#1370
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#1370
(Original post by seizetoday)
I got 356 seconds :s
Yeah it was a small number
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TiiMMYz
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#1371
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#1371
I used to have dreams and aspirations... then I opened the g484 paper
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SkilledNChilled
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#1372
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#1372
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
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TeeCe
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#1373
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#1373
(Original post by a123a)
Yeah I put this.
I wrote my two points on convection, radiation and conductiom :/
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a123a
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#1374
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#1374
(Original post by MrChemKid)
Planets mass- something x 10^30?
Yeah, I think 1.97*10^30?
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Ebm7
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#1375
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#1375
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
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L'Evil Fish
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#1376
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#1376
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:
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Jim997
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#1377
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#1377
(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?
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MathsAddict
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#1378
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#1378
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.
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a123a
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#1379
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#1379
(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?
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examinationtsr
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#1380
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#1380
(Original post by trooken)
Heat flows to other parts of metal?

Posted from TSR Mobile
and heat lost to surrounding air.

Some photons may have been reflected
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