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AQA PHYA5 Option D: turning points - Special relativity question HELP Watch

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    From the June 2015 paper, could anyone explain to me how to do this question please?





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    (Original post by Music With Rocks)
    From the June 2015 paper, could anyone explain to me how to do this question please?

    which q mate
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    (Original post by Formless)
    which q mate
    Hmmm my embedded images don't seem to be working lately, can you see it now?

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    (Original post by Music With Rocks)
    Hmmm my embedded images don't seem to be working lately, can you see it now?

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    So find the mass of the electron when its at 0.98c
    = (9.11x10^-31) /sqrt( 1-0.98^2)
    =4.6x10^-30

    E = mc^2

    so multiply the above mass by c^2

    (9.11x10^-31) x (3x10^8)^2 / sqrt( 1-0.98^2)
    =4.6x10^-30 x (3x10^8)^2
    =4.12x10^-13 J
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    (Original post by Formless)

    So find the mass of the electron when its at 0.98c
    = (9.11x10^-31) /sqrt( 1-0.98^2)
    =4.6x10^-30

    E = mc^2

    so multiply the above mass by c^2

    (9.11x10^-31) x (3x10^8)^2 / sqrt( 1-0.98^2)
    =4.6x10^-30 x (3x10^8)^2
    =4.12x10^-13 J
    That is perfect, thank you very much for the explanation I understand it now
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    (Original post by Music With Rocks)
    That is perfect, thank you very much for the explanation I understand it now
    No worries feel free to hit me up with queries, i dont feel quite ready for tomorrow aha
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    (Original post by Formless)
    No worries feel free to hit me up with queries, i dont feel quite ready for tomorrow aha
    I will certainly take up that offer haha, me neither I have been doing well in past papers but don't feel quite like I am there yet
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    (Original post by Music With Rocks)
    I will certainly take up that offer haha, me neither I have been doing well in past papers but don't feel quite like I am there yet
    Im just too excited that it my last exam dont want it to make me perform badly
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    (Original post by Formless)
    Im just too excited that it my last exam dont want it to make me perform badly
    Same here, I feel like I am done already but this exam is just as important as the others

    Plus I am still knackered from having an exam this morning
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    (Original post by Music With Rocks)
    Same here, I feel like I am done already but this exam is just as important as the others

    Plus I am still knackered from having an exam this morning

    Heard S2 Was v difficult. FP3 was okay ive heard. Which one did you do?
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    (Original post by Formless)
    Heard S2 Was v difficult. FP3 was okay ive heard. Which one did you do?
    S2 thank god haha, had a hard enough time with FP2. S2 wasn't too bad but I messed up a fair bit as I only left myself the weekend to revise it, so lots of dumb errors.I am definitely needing a good PHYA5 performance.
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    (Original post by Music With Rocks)
    S2 thank god haha, had a hard enough time with FP2. S2 wasn't too bad but I messed up a fair bit as I only left myself the weekend to revise it, so lots of dumb errors.I am definitely needing a good PHYA5 performance.
    Ah okay, good luck for tomo mate
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    (Original post by Formless)
    Ah okay, good luck for tomo mate
    Good luck to you too!
 
 
 
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