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# Edexcel Unit 4: Physics on the Move 6PH04 (11th June 2015) Watch

• View Poll Results: What do you think the grade boundary for an A will be?
GCE-65+
3
3.57%
GCE-60-64
28
33.33%
GCE-55-59
31
36.90%
GCE-50-54
8
9.52%
GCE-45-49
1
1.19%
GCE- Lower than 44
0
0%
IAL-65+
5
5.95%
IAL-60-64
6
7.14%
IAL-55-59
2
2.38%
IAL-50-54
0
0%
IAL-45-49
0
0%
IAL- Lower than 44
0
0%

1. (Original post by bbyturtlexox)
no it was; the energy of the photons produced when a proton and antiproton collide , or something like that
that's what i put, i think it was B
2. Let's make an unofficial mark scheme all together by editing this google document!!

+ Write down the question if you can remember it
+ If you see an answer you agree , add [+1] behind it
+ If you have a different answer, write it below the old one
+ If you can't remember the number of the question, put it in the "unclassified question"
3. (Original post by Eeeeeeee)
I thought kinetic energy isn't conserved because chemical energy is transferred to kinetic energy?
Total energy is conserved

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4. Vote on poll:http://strawpoll.me/4601250
5. (Original post by manglekuo)
let's make an unofficial mark scheme all together by editing this google document!!

+ write down the question if you can remember it
+ if you see an answer you agree , add [+1] behind it
+ if you have a different answer, write it below the old one
+ if you can't remember the number of the question, put it in the "unclassified question"
you are so awesome
6. Q12 june 13 (R) was very similar to the question on 6 mark Q on the probe in space.
7. (Original post by Nick.p97)
kinetic energy in the system increases but total energy is conserved
Will I lose a mark for not saying that total energy is conserved?
I did put that kinetic energy is not conserved
I got 4.4s for RC (losing 67% of charge) and 1.1s for losing half the energy

Hence losing half the energy takes less time
dont think so... show method for the 1.1s pleaseusing 0.5Wi=1/2Q^2/C and Wi=1/2Qi^2/C, Qi^2=2Q1^2sqrt both sides; Qi=sqrt2Qhence half energy is reached by the time Q=Qi/sqrt2, so time taken to reach half energy is soner...to check this input 1/2Qi into the equation for energy, youll find at q=1/2Qi energy is 0.25 its initial
9. Poll on difficulty:http://strawpoll.me/4601250
10. Attachment 425413425415 this question from the jun 13(R) paper was very similar to the 6 mark space probe question
Attached Images

11. Why would there be chemical energy- the tanks were empty? I thought the explosion was just mechanical

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12. (Original post by BP_Tranquility)
Why would there be chemical energy- the tanks were empty?

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Well, it said tank, singular, I think, and an explosion needs fuel so it had to come from somewhere. I thought of both these points and decided to respond that there was an increase.

Btw, you are a boss for posting that MS
13. (Original post by BP_Tranquility)
Why would there be chemical energy- the tanks were empty? I thought the explosion was just mechanical

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thought the same thing, i guess maybe the chemical energy used to propel it outward, regardless thats 2 marks lost max wouldnt worry
14. (Original post by BP_Tranquility)
Why would there be chemical energy- the tanks were empty? I thought the explosion was just mechanical

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I was thinking this :/
15. For the capacitor q, I said that since W=½QV , if the charge halves then the energy stored is divided by 4. So the energy must halve before the charge halves . is that correct?

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16. (Original post by Nick.p97)
kg^-1 m^-3 s^4 A^2 i think
surely it's only s^2?
17. (Original post by MangleKuo)
Let's make an unofficial mark scheme all together by editing this google document!!

+ Write down the question if you can remember it
+ If you see an answer you agree , add [+1] behind it
+ If you have a different answer, write it below the old one
+ If you can't remember the number of the question, put it in the "unclassified question"
Great idea!!
18. (Original post by andysharp)
I don't think that's right. Energy of a photon = hf, and E=mc^2 can't be applied as a photon has no mass
negligible mass, not no mass, when a photon is at rest it has no mass. I know most at my college put the photon as the answer, including myself
19. (Original post by BP_Tranquility)
For the capacitor q, I said that since W=½QV , if the charge halves then the energy stored is divided by 4. So the energy must halve before the charge halves . is that correct?

Posted from TSR Mobile
yes
20. How did everyone work out the tension question?

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