AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread]

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Well it cannot be A because gravity is always attractive( at least to what we know)

Cannot be B because if the gravitational field at the surface of the earth was zero we would be floating. Or the fact the earth has mass cannot have a zero field strength at its surface

It's C and The proof of that is in the book

It's not D because potential is work done per unit mass so it must be J/kg
• once you are confident that you know which one is correct leave the rest but have a glance at them

Edit: typing error

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That makes sense, I originally thought it was D, but looking at the data sheet it's easy to see! Thanks for reply

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Reply 3161

Absent Agent

Original post by Klaxoii

That makes sense, I originally thought it was D, but looking at the data sheet it's easy to see! Thanks for reply

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It's ok, I'm happy you've understood it

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Reply 3162

CD223

I know this is a massive stab in the dark, but is anyone likely to be able to take a copy of the paper home? We could then do an unofficial mark scheme for the multiple choice!

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Reply 3163

Jimmy20002012

Original post by CD223

I will give it a try, but unlikely since my college is so. Strict in giving them out. By the way how did you find C4? Wasn't too bad?

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Reply 3164

JJBinn

Original post by Kennethm

I cannot fxcking believe im asking this - how on earth do you do Q3
http://filestore.aqa.org.uk/subjects/AQA-PHYA41-QP-JUN14.PDF

Not sure if you've had this answered, I've done this question seemingly 1000 times.

velocity is 2x10^-4/7.2x10^-4

momentum=mv, so just need the mass now

as density=mass/volume
volume x density = mass

therefore, momentum = volume x density x velocity, so (1000x2x10^-4)x(2x10^4/7.2x10^-4)

hope this works out, I haven't got my calculator on hand

Reply 3165

Klaxoii

As you can tell, I hated. June 2014, does someone mind explaining these?

ImageUploadedByStudent Room1433883602.869669.jpg

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(edited 8 years ago)

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Reply 3166

xela238

6 Marker Predictions?

Reply 3167

Klaxoii

And this question, ImageUploadedByStudent Room1433883749.672109.jpg

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Reply 3168

ShutUpLegs

Could someone work through 1C of Jun13 for me? I always seem to come undone on the phase difference questions and the mark scheme doesn't really help me either.

http://filestore.aqa.org.uk/subjects/AQA-PHYA4-2-QP-JUN13.PDF

Reply 3169

CD223

Original post by Jimmy20002012

I will give it a try, but unlikely since my college is so. Strict in giving them out. By the way how did you find C4? Wasn't too bad?

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Thanks buddy! I hated C4 :frown:

didn't answer the question on E, and got the implicit differentiation wrong so I lost 10 marks. Hoping I got 100 on C3 to make up for it. What do you think 65/75 will give UMS wise? Desperate for an A*.

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Reply 3170

Absent Agent

Original post by CD223

Man, I've been thinking about getting one before that and we can do it, we just need to corporate well. We just need somebody having a good insight into the web. Unfortunately i don't have the required apparatus otherwise that wouldn't be a problem.

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Reply 3171

Lau14

Original post by CD223

I was thinking of just writing the letters down on my calculator if I get the time, so I've at least got something to compare, even if it's not very helpful without the questions. Can't get hold of the paper though unfortunately :/

Reply 3172

JJBinn

Original post by ShutUpLegs

I think the 'method' for this is to work out a lowest common factor but I don't really get that.

I've learnt that you can use the difference in time period, then divide the smaller of the two periods by the time difference. This will give you the amount of oscillations the longer period needs to do before they are in phase again.

Reply 3173

xela238

Original post by Mehrdad jafari

we need the deeeepppp darrkkkk web

Reply 3174

Absent Agent

Original post by Lau14

Yeah, that's a good idea but it would be better knowing the questions too :frown:

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Reply 3175

adil1231

Original post by Mehrdad jafari

Yes, you did but you didn't need to say that he was wrong. The person asked the question had the mark scheme at hand and so he would know whether anybody's suggestion matches the mark scheme or not. And also he would know eventually if he was wrong.

Well, i don't think his saying that would make anybody feel dumb. The exam is only a few days a head and we should now be able to tackle the problems independently. During the exam there is nobody to help you with the questions. If now you don't want to think hard about a question then you will have difficulty during the exam.

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Lol are you his boyfriend or something?

Reply 3176

Jimmy20002012

Original post by CD223

Thanks buddy! I hated C4 :frown:

It's alright! Was totally opposite for me lost like 12 marks in C3 and think I got around 68 in C4. Even though C4 was my weaker one. You should defiantly get into the 90s I think, think an A will be like 58 or something what you thinking? Sure you will get that A*!

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