PHYA5 ~ 20th June 2013 ~ A2 Physics

What are your opinions on the isa grade boundaries this year? Do you think they will go up, down or remain the same as last year?

They are usually high.... hmm not sure why I'll be expecting no more than 50% of the UMS obtained on my ISAs lol :/ no one ever does well at our school.

Well we all didn't think we did that bad at AS last year, but the class were scraping Es it turned out in the end

Yo how was unit 4

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can anyone help me with part c of this question? it's not an applied topic

can anyone help me with part c of this question? it's not an applied topic

Wow how is there 29 pages in this thread already? The unit 4 one had no where near as much a week before the exam

Could someone link the A2 and astrophysics formula sheets? I can't seem to find them on the AQA website. Thanks.

can anyone help me with part c of this question? it's not an applied topic

I think it'd be much lower than 40 degrees Celsius because since it's not insulated... it will reach thermal equilibrium with the room... so the water will reach room temperature (or a little bit above it), but definitely lower than 40 degrees I would have thought.

It would be lower as your calculations take no account for heat loss to the environment

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Would you have to state the doppler shift of wavelength is negative for a source moving towards the receiver?

Yes, I think it's an important enough distinction.

It would be lower as your calculations take no account for heat loss to the environment

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Wouldn't it be higher, because the average temperature of the ice/water throughout the experiment is below the room temperature, and so there will be a net flow of heat into the water/ice?

Not sure what you mea they did say the whole procedure was repeated... and at the end of the procedure the temperature of the water was 40 degrees when previously done in an insulated container But I'm thinking if it's uninsulated this time then there will be ever greater energy loss to the surrounding

But at the start and through most of the experiment, the ice/water is colder than the surroundings- so it will gain energy from the surroundings.

But if it's lower then surely it is losing heat ? Since it is uninsulated it will lose heat to the room (which I assume is of significant volume also), and will reach thermal equilibrium with the room? I think I may have misunderstood the question also, I thought they do the experiment obtain a water of 40 degrees & then leave it in the room So I was probably incorrect to mention thermal equilibrium...

I'm confused now because an insulated container would absorb some of the heat, creating heat loss... but an uninsulated container would create greater heat loss into the room? Which has a significant volume and a much lower temperature. Confused



Not sure what you mea they did say the whole procedure was repeated... and at the end of the procedure the temperature of the water was 40 degrees when previously done in an insulated container But I'm thinking if it's uninsulated this time then there will be ever greater energy loss to the surrounding