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

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    (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
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    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"
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    (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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    Vote on poll:http://strawpoll.me/4601250
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    (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
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    Q12 june 13 (R) was very similar to the question on 6 mark Q on the probe in space.
    https://googledrive.com/host/0B1ZiqB...%20Physics.pdf
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    (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
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    (Original post by Sayersss)
    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
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    Poll on difficulty:http://strawpoll.me/4601250
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    Name:  IMG-20150611-WA0007.jpg
Views: 163
Size:  483.6 KBAttachment 425413425415 this question from the jun 13(R) paper was very similar to the 6 mark space probe question
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    Why would there be chemical energy- the tanks were empty? I thought the explosion was just mechanical

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    (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
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    (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
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    (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 :/
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    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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    (Original post by Nick.p97)
    kg^-1 m^-3 s^4 A^2 i think
    surely it's only s^2?
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    (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!!
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    (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
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    (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?

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    yes
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    How did everyone work out the tension question?
 
 
 
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