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AQA Physics A Unit 4- 11 June 2014

For question 3 part 4, you are right that it was a minus cosine, but wasn't it just 1 wave, since it said that the period was 1.2 seconds?

if the time period was 0.8s then in 1.2 s, thenre would have been one and a half waves i think :/

Reply 1381

BigBadJFly

1

Original post by Mathsforlife

I did section A in like 35 mins, Found most of section B pretty nice aswell .. however only question I found hard was 6 marker! I mean I just could think. Im pretty sure I got rest of the paper right.

Yeah, I think I did well in B - probably 43 minimum
But A I have no idea how I did, It seemed like they gathered up all the hard ones from past papers, chucked a few of them in, and then came up with some new hard ones. There wasn't many that took me less than a minute :frown:

Reply 1382

bengoode1

For Q4 part 1 did anyone else get C=6.1x10^-5 and use that to get R=4.9x10^5 in part 2???

Reply 1383

Mathsforlife

1

Original post by Sciencefella

i disagree with the resistance... i got 4.9x10^5

Did you do 6 - 2.2 to get voltage across resistor .. i remember getting your answer when i initially forgot to do that!

Reply 1384

Davelittle

13

Original post by Sciencefella

i disagree with the resistance... i got 4.9x10^5

I've re-done the workings elsewhere on the thread, did you take the capacitor voltage off 6.0?

(edited 9 years ago)

Reply 1385

lebron_23

2

Original post by Surf

Love the way you have to put '/sarcasm'!!!!

I hate the way exams are all down to one freaking day!

You don't understand how nice it feels to have someone else say that too.

I mean, it's ridiculous having the rest of your life resting on a single exam. It is by no means a true test of somones actual abilities.

I can imagine the conversation with UCL..

'.. But (insert name here), I promise you, I really am intelligent..'

*Looks at D grade in physics*

*Dies*

Reply 1386

Mathsforlife

1

Original post by BigBadJFly

Yeah, I think I did well in B - probably 43 minimum
But A I have no idea how I did, It seemed like they gathered up all the hard ones from past papers, chucked a few of them in, and then came up with some new hard ones. There wasn't many that took me less than a minute :frown:

I thought A was really nice .. did it in like 35 mins!

Reply 1387

bengoode1

Original post by Mathsforlife

Did you do 6 - 2.2 to get voltage across resistor .. i remember getting your answer when i initially forgot to do that!

I got R=-t/Cln(V/V0) using V as 2.2 and V0 as 6

Reply 1388

YOOZERNAYME

guysssss we shouldn't be on here!! haha (I'm just as bad, I know :tongue:

) I'm guessing most of you also do biology, which is on Friday!!! eeeeeekkkk!!! What's done is done, and lets go SMASH those other exams like we know we can!! PEACE!! (even though I'll probably come back on here in about 2 minutes) haha

Reply 1389

Sayonara

11

What did people get for the question which had:
B) 12.5V
C) 33.3V
D) 37.5V (something like that).

Reply 1390

Kieranw5

Original post by bengoode1

I got R=-t/Cln(V/V0) using V as 2.2 and V0 as 6

This is exactly what I did

Reply 1391

PrinceyJ

12

Original post by Sayonara

What did people get for the question which had:
B) 12.5V
C) 33.3V
D) 37.5V (something like that).

I put 37.5 but that was a complete guess.

Reply 1392

BigBadJFly

1

Original post by Mathsforlife

I thought A was really nice .. did it in like 35 mins!

Much preferred B

In the last 4 section As I've done I got 23/25 in all of them, so hopefully I got at least 18 in this one :smile:

Reply 1393

Mathsforlife

1

Original post by bengoode1

I got R=-t/Cln(V/V0) using V as 2.2 and V0 as 6

<br>
<br>Not sure what ur doing ... just use V=IR ... R is changing so u cant use that formula .. as RC is not a constant!

Reply 1394

Davelittle

13

Original post by Big-Daddy

Should be gravitational and elastic potential energies as that's what they asked for. Should be E=F/(-3e) because I think the particle was negatively charged, though I'm not sure if it makes a difference - they asked for electric field strength AFAIK rather than magnitude of it, so it makes sense to take in the same direction as force.
4.1. capacitance should be given in F rather than microfarads, so your answer divided by 10⁶.

And I am not very sure about your explanation in 3.2 or 3.3.

Personally my answer for 3.2 went well over the box - I couldn't get even close to fitting it in that little space. It may only be 2 marks but I have no idea what those two were for.

Yup 14mm sounds familiar.

I left the minus sign out as the field strength has nothing to do with the test charge in it, doubt it matters though tbh

Reply 1395

Jackle123

Original post by Sayonara

What did people get for the question which had:
B) 12.5V
C) 33.3V
D) 37.5V (something like that).

I got 33.3 and im pretty sure its correct

Reply 1396

shahbaz

15

worked out R0 using max voltage then did used it to work out rime constant then did an expenential using resistance and got like 900K ohms.

Reply 1397

charlesbatchelor

Original post by Bob296

what did everyone get for the displacement from point p on that circle question (section a)?

Definitely 1.6m, pi/2 for w, multiply by 6 seconds gives 3pi so the displacement was on the opposite side of the circle of radius (0.8m)

Reply 1398

Mathsforlife

1

Original post by BigBadJFly

Much preferred B

In the last 4 section As I've done I got 23/25 in all of them, so hopefully I got at least 18 in this one :smile:

Which ones did u find hard? I feel like I got all 25 .. not sure tho

Reply 1399

Sciencefella

Original post by Davelittle

I've re-done the workings elsewhere on the thread, did you take the capacitor voltage off 6.0?

no but by doing the other way... and using the equation with e^-t/RC you get 4.9x10^5

AQA Physics A Unit 4- 11 June 2014

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