PHYA5 ~ 20th June 2013 ~ A2 Physics

Hey guys can someone help me with question 4 on topic 12.1 in the the nelson thrones book.

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A) p1v1=p2v2

(1.20 x 10^-4 +x)(110000) = (1.20 x 10^-4)(135000)

Solve for x.

B) 110000(1.2 x10^-4 +2.7x10-5 - x) = (1.20 x 10^-4 - x)(141000)
Where x is the difference in volume due to the powder. Solve for x and you should get 2.32 x10^-5.
Then it's a simple case of mass/volume =density.

Reply 861

D4rth

9

Original post by Pinkhead

p1v1=p2v2

p1=99000, v1 = 3.5x10^-4
v2= v1+ 6.5x10^-5
should get something like 83Kpa

I don't understand why you would add on the volumes? I thought you would subtract it as the volume of bottle would be getting less.

Or is it because as they're joined, the volume of pump increases so the volume of bottle would also increase?

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Reply 862

TauMuon

10

How's everyone feeling about this exam? I personally think it's deceptively easier than unit 4; kinda makes me think I'm missing something...

I dislike some thermodynamics (I'm doing the applied physics option) but apart from that it should be okay, fingers crossed! :biggrin:

Reply 863

The H

1

Original post by TauMuon

How's everyone feeling about this exam? I personally think it's deceptively easier than unit 4; kinda makes me think I'm missing something...

I dislike some thermodynamics (I'm doing the applied physics option) but apart from that it should be okay, fingers crossed! :biggrin:

In some ways it is actually easier than unit 4, but for some reason I don't feel like it is and I'm more nervous about this exam than unit 4.
But if AQA are generous with this one, i should be ok

Reply 864

Namige

17

I haven't started revising until tomorrow... am I screwed?

Reply 865

TauMuon

10

Original post by The H

In some ways it is actually easier than unit 4, but for some reason I don't feel like it is and I'm more nervous about this exam than unit 4.
But if AQA are generous with this one, i should be ok

"If AQA are generous with this one"

Bwahahahaha, don't make me laugh...

Every single AQA paper I've done so far has been nasty :'(

Reply 866

TauMuon

10

Original post by Namige

I haven't started revising until tomorrow... am I screwed?

Coffee is about to become your best friend :wink:

Reply 867

The H

1

Original post by TauMuon

"If AQA are generous with this one"

Bwahahahaha, don't make me laugh...

Every single AQA paper I've done so far has been nasty :'(

Sorry slipped on the keyboard :s-smilie:

Reply 868

Jack93o

15

need help on question 1b ii) in page 219 of the nelson thornes book

it doesn't give you the molar mass of oxygen, how the heck are you supposed to work it out?

Reply 869

Dirtybit

20

Original post by Namige

I haven't started revising until tomorrow... am I screwed?

Time will tell, time will tell :troll:

Reply 870

D4rth

9

Original post by TauMuon

How's everyone feeling about this exam? I personally think it's deceptively easier than unit 4; kinda makes me think I'm missing something...

I dislike some thermodynamics (I'm doing the applied physics option) but apart from that it should be okay, fingers crossed! :biggrin:

I agree, I'm doing applied too but I think its all pretty good! Feeling a lot more confident than for phya4.

Just need to think straight, calmly and rationally.

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Reply 871

amish123

I've got a feeling they are going to give a few synoptic questions. I would go over things like circular motion just to be on the safe side. For those doing astro, how are you feeling?

Reply 872

The H

1

Nuclear physics is my weakest part of P5, hope it's not as bad as last years

Reply 873

Namige

17

Original post by TauMuon

Coffee is about to become your best friend :wink:

Well I just looked at the past papers(skim read) and the textbook, and it all looks pretty easy... I suppose I'll have to get cracking on the past papers tomorrow.. I find unit 5 to be so much more simple than unit 4.. does anyone agree? Or am I deluded..

Reply 874

TauMuon

10

Original post by Jack93o

need help on question 1b ii) in page 219 of the nelson thornes book

it doesn't give you the molar mass of oxygen, how the heck are you supposed to work it out?

I think they just expect you to know that oxygen gas (O₂) has a molar mass of 32 gmol^-1

Edit: I'm certain in a new-spec paper they would give it to you though :P

(edited 10 years ago)

Reply 875

TauMuon

10

Original post by Namige

Well I just looked at the past papers(skim read) and the textbook, and it all looks pretty easy... I suppose I'll have to get cracking on the past papers tomorrow.. I find unit 5 to be so much more simple than unit 4.. does anyone agree? Or am I deluded..

I agree completely! There was so much to learn in unit 4, and so many equations! Not to mention a lot of the fields stuff can be quite conceptually difficult... this unit definitely seems more straightforward. :P

Reply 876

jonnyb123

9

Original post by TauMuon

I agree completely! There was so much to learn in unit 4, and so many equations! Not to mention a lot of the fields stuff can be quite conceptually difficult... this unit definitely seems more straightforward. :P

Yup I agree with this too, though there is a lot to learn for medical physics for me! Still I find unit 5 easier than unit 4.

Reply 877

Jack93o

15

Original post by TauMuon

I think they just expect you to know that oxygen gas (O₂) has a molar mass of 32 gmol^-1

Edit: I'm certain in a new-spec paper they would give it to you though :P

thats a relief to know

Reply 878

Jack93o

15

Original post by Namige

Well I just looked at the past papers(skim read) and the textbook, and it all looks pretty easy... I suppose I'll have to get cracking on the past papers tomorrow.. I find unit 5 to be so much more simple than unit 4.. does anyone agree? Or am I deluded..

depends really, the 6 markers in unit 4 are pretty good because they don't ask you to describe practicals and that how science works stuff, instead they usually just ask you to talk about/describe a concept

btw what sort of 6 markers do we need to get in unit 5? is it similar to unit 4?

also, I'm sure I heard right that in unit 5, we get two 6 markers (one in section A, one in section B) instead of one, so thats worse than unit 4