AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread]

Well the nuclear physics test was obviously well planned... the 4th question was one we did last week and work 10/36 marks. Must start revising for mock soon but I'm so tired :/

Ah that's unfortunate! I'm tired too


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Kind of regretting choosing 4 a levels

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Me too! What do you do?


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Me too! What do you do?


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Chemistry, physics, maths and further maths. Everything is just stressing me out so much at the moment. What about you?

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Yeah I can sympathise! Maths, physics, computing and history! Which do you find hardest?


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Further maths. Or maybe chemistry. :/ not sure - what about you?

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Ah that's understandable. I've heard they're hard. For me it's physics actually!


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Physics is really tough in some areas I find too! Ironically, I do chemistry and still struggle with physics kinetic theory.(In unit5) I also really don't like gravitational fields in unit 4 either blehh.

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Yeah thermal physics is my weakness too.


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A cola drink of mass 0. 200 kg at a temperature of 3. 0 oC is poured into a glass beaker.The beaker has a mass of 0.250kg and is initially at a temperature of 30.0oC.

specific heat capacity of glass = 840 J kg–1 K–1

specific heat capacity of cola = 4190 J kg–1 K–1

Show that the final temperature, Tf, of the cola drink is about 8 oC when it reachesthermal equilibrium with the beaker.

Assume no heat is gained from or lost to the surroundings.



I have no idea what to do! Any help would be much appreciated.


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Does this help at all?

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Thank you! That helps a lot. Just one question, how did set up the equations? I know you used mct but how did you know to use (30-tf) and (tf-3.0)?


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I kinda fudged it a little. Because the temperature we were aiming for is around 8, doing it that way around keeps the change in temperature positive if you know what I mean? If you did (T-30) it would be negative and mess stuff up.

There's probably a better reason to doing this but that's the reason why I did it

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Oh true, it makes sense this way. Thanks once again.
Have you got any decent revision notes for AQA Unit 5?


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I mean I only have my personal notes that I made in class but I can scan all the stuff I made on thermal in if you want I mean you can't really read the picture but that's kinda what they look like with layout and such. Let me know if you want me to scan them for you

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That's what us helpers on the studentroom are for! Post away.

Scanning them is going to be a right hassle for you. :/
It's fine, was wondering if you had any notes typed up because my teacher this year is awful. Don't know how she graduated with a physics degree because she doesn't seem to know anything. Whenever we ask her a question regarding the content she has to google it and gets answers off wikipedia! -.-
But thanks for offering anyway and for your help on the question. Much appreciated!
I'm probably going to make summary notes from the CGP revision guide.


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