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A2 (Edexcel) Physics Unit 4 'Physics on the Move' - 24th January 2012

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Reply 60
Original post by HassanZia
guyz the problem with june 2011 paper is that theyve started asking so much irrelevant stuff.. I wish i was born 2 years earlier lol..


Yeaa! It was easier back then! :/ Aghh. Lets hope that the exam is and "easy" one :P
Reply 61
Can someone explain why Q5 on the Jan 2010 is C. Im doing F=BILsin(theta) x N
Reply 62
Original post by tomvars
Can someone explain why Q5 on the Jan 2010 is C. Im doing F=BILsin(theta) x N


The side QS is always perpendicular to the magnetic field lines
Reply 63
Original post by ahmedm0209
The side QS is always perpendicular to the magnetic field lines


oooohhhhh thank you
Reply 64
Original post by gcse_____
Ppl is June 2011 extremely different and difficult than other papers or is it just me .......


idk
bio 1 2
phy 1 2
chem 2
all of em were easy
What's an alternative way to convert Mev/c2 into kg? Is there a way to do this using E=mc2?

Here's how I do it:
(edited 12 years ago)
Reply 66
Original post by Alpha-Omega
What's an alternative way to convert Mev/c2 into kg? Is there a way to do this using E=mc2?

Here's how I do it:


You are using E=mc^2 there (-aren't you?). 'Masses' quoted in those units are simply referring to the energy created when the mass you are talking about disappears. So you convert to joules and divide by the speed of light squared to get the mass value.
Reply 67
I'm cacking myself for this test.
Gotta keep remembering that 75% will almost certainly be an A. :redface:
Original post by MHRed
I'm cacking myself for this test.
Gotta keep remembering that 75% will almost certainly be an A. :redface:


In January 2011 test paper, 71.25% is already an A*.
Reply 69
We never actually went over cyclotrons in class, so I've had to teach myself the entire theory behind it. I guess any questions to do with Rutherford firing alpha particles just requires a stock answer that can cover all points regardless of how the question is structured.

I just hope it's a nice paper; I resat Papers 1 & 2 and they were way too wordy. I deserve a break...
Reply 71
2mw !!! Aghhh! :/ Panicking
Reply 72
tomorrow :s-smilie: bumping this thread for discussion :biggrin:
Reply 73
i think faradays and lenzs law is going to come up in this paper, because it didnt come up in june 11
Reply 74
Particle physics question:

Proton + anti-proton---> 2Pion+ + 2Pion- + Pion0

anti-proton collides with proton which is at rest. Anti-proton has an energy of 1 GeV, proton mass is 940MeV/c^2, mass of neutral pion is 135 MeV/c^2 and mass of a charged pion is 140MeV/c^2

How much energy was available for kinetic energy of the pions?
Reply 75
Original post by tomvars
Particle physics question:

Proton + anti-proton---> 2Pion+ + 2Pion- + Pion0

anti-proton collides with proton which is at rest. Anti-proton has an energy of 1 GeV, proton mass is 940MeV/c^2, mass of neutral pion is 135 MeV/c^2 and mass of a charged pion is 140MeV/c^2

How much energy was available for kinetic energy of the pions?


Anti-proton has the same mass as a proton.
Convert masses of protons and anti-protons to energy values.
Sum these energy values with the KE value of the anti-proton (given).

The energy necessary to form the particles on the right has already been given.

Subtract to find the energy left, which is the energy available for the KE of the pions.

It's just conserving energy, but you have to take into account that mass and energy can interchange on a sub-atomic level.
In case anyone cares, I'm currently watching this video for revision:

Reply 77
Original post by fluteflute
In case anyone cares, I'm currently watching this video for revision:



OMG. Thankss (: x
Reply 78
it seems like january's paper is more difficult :frown:
Reply 79
Anyone have any revision notes? this edexcel book sucks =P

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