Physics question.

Energize · 20 Jan 2008 at 19:57

http://www.aqa.org.uk/qual/gceasa/qp-ms/AQA-PHB4-W-QP-JUN05.PDF

Q3B

Can someone please tell me how to get 2x10-5 Kg?

Taking the values v= 11.2x10-2 m3 and T = 293K and using the equation n=pV/RT I get 4.61 mol, and thus 0.20 Kg.

Am I doing something obviously wrong here? :confused:

Energize · 20 Jan 2008 at 20:43

georges said:
Doing this tomorrow AM by any chance?

Heh, last minute revision.

Cheers everyone. I thought it would be some simple error like that.

Energize · 20 Jan 2008 at 20:58

georges said:
Yeah, I was doing the same.. sadly I have a banging headache so I had to give up.

I'm just trying to learn all the equations and main marking points. It seems with physics all I am learning these days is how to do the exams, because the mark schemes are so ridiculously pedantic and so much stuff is crammed into one module. It's impossible for me to really understand quite a bit of the actual physics.

Energize · 20 Jan 2008 at 22:27

Memphis said:
Didn't think homework help was allowed here.

It's isn't homework, it's exam practice.

Energize · 20 Jan 2008 at 23:38

Does anyone know how to rearrange the exponential discharge equation v1=v0*e^-t/r*c in terms of -t? It's beyond my mathematical ability.