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

Alex621
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#881
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#881
Do you use 273 or 273.15 to convert between temperatures
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AwesomeSauce#1
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#882
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(Original post by AlexParmenter)
Do you use 273 or 273.15 to convert between temperatures
i normally use 273 because in the mark scheme it doesn't mention 273.15, but can't believe that they would mark you down for being more accurate. Who knows, they might even bring in a question about the triple point of water which would need that accuracy.
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I Persia I
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#883
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I think potential energy is greatest in solids and decreasing until gas which there is assumed to be none(?) (Ideal gases?) I remember reading something like Internal energy = Kinetic energy in gases therefore there is 0 potential energy or negligible or whatever verbose way you wanna put it. I hate how unclear OCR exams are with stuff like this.
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Raizel
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#884
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(Original post by kateyl)
Not sure if it's just me but I think I saw a similar question in another paper, and the mark scheme said you had to write that the PE wasn't increasing as the temperature was increasing :/

My teacher said that you could get around the problem of whether or not to say PE is increasing by saying that "there is a negligible increase in potential energy" but I honestly don't know if they would give the mark for that lol
OCR and their mark schemes...
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indiaharding
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#885
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(Original post by Tazmain)
I don't think they are released, tried finding them online. Just finished it, how'd you do?
Only got 71 in the specimen, quite a hard paper to be fair, how have you done on it?


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Raizel
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#886
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I think everyone should go over the june 2014 paper, it was a difficult paper.
I didn't know how to answer the last question relating to pressure and density, so it should be good practice.
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neverseenanalien
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#887
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#887
Guys please help me!!!!!!

It says that in a circle, when weight provides the centripetal force the astronaut feels weightless, I though Centripetal is constant and is the same at every point, Could you please explain.
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papayarama
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#888
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do I lose marks if I don't quote in the same number of sig fig as stated in the mark scheme? say if I quoted to 1sf more than what it says in the markscheme for Accuracy mark?? 😁


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Oraeng
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#889
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Does anyone know anything about changes in 'order of particle arrangement' during a change of state? What does it mean?

Also are you supposed to say 'state' or 'phase' or does it not matter?
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Oraeng
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(Original post by papayarama)
do I lose marks if I don't quote in the same number of sig fig as stated in the mark scheme? say if I quoted to 1sf more than what it says in the markscheme for Accuracy mark?? 😁


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My teacher told us to always quote your answer to 3 sig. figs and you will never lose the mark
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Tazmain
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#891
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(Original post by indiaharding)
Only got 71 in the specimen, quite a hard paper to be fair, how have you done on it?


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Yeah, got somewhere between 70%-77%. Some of those marking points were vague so It was a bit difficult mark it accurately. I agree it was kinda tough, but I made some stupid mistakes along the way. All in all good practice.
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Alex621
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#892
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I'm so confused I thought potential energy increases as you go from solid to Liquid to gas? So on a heating curve there is positive gradient as a solid heats up which is the increase in kinetic energy then when the solid melts the gradient goes to 0 as the potential energy increases but kinetic energy stays the same hence the temperature don't increase? Or are you all talking about something else
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rachelc142
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#893
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anyone got june 14 paper and ms please?
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Tazmain
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#894
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(Original post by papayarama)
do I lose marks if I don't quote in the same number of sig fig as stated in the mark scheme? say if I quoted to 1sf more than what it says in the markscheme for Accuracy mark?? 😁


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Any 2sf or 3sf answers are fine. If you write to 1sf I think you get penalised once throughout the whole exam. I'd stick to 3sf if that's what you're using now. You may lose marks if you write to a greater sf than 3sf in some occasions, but I'm not sure about that.
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SomeGuy96
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(Original post by AlexParmenter)
I'm so confused I thought potential energy increases as you go from solid to Liquid to gas? So on a heating curve there is positive gradient as a solid heats up which is the increase in kinetic energy then when the solid melts the gradient goes to 0 as the potential energy increases but kinetic energy stays the same hence the temperature don't increase? Or are you all talking about something else
The potential energy of something decreases as it goes from solid to gas state. Think about the graph you are describing; the gradient would still go to zero even if the potential energy was decreasing, as it depends solely on the temperature of the object, which the potential energy plays no part in.
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imusti96
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(Original post by rachelc142)
anyone got june 14 paper and ms please?
https://drive.google.com/folderview?...9WRDZRa2dJQkE#
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rachelc142
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#897
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ty very much!!
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Makashima
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#898
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in shm motion, one oscillation is actually 1/4 of the time period?
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Raizel
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#899
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Guys can someone go explain why it is (m/M) for question 6c on the june 2014 paper https://drive.google.com/folderview?...9WRDZRa2dJQkE#
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Alex621
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(Original post by SomeGuy96)
The potential energy of something decreases as it goes from solid to gas state. Think about the graph you are describing; the gradient would still go to zero even if the potential energy was decreasing, as it depends solely on the temperature of the object, which the potential energy plays no part in.
In the textbook is says molecules in steam have far greater random potential energy than those in boiling water


Also if the curve is energy against temperature, and the temperature isn't increasing, the substance is still absorbing heat so that heat would be used to increase the potential energy
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