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

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

2. (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
3. (Original post by Formless)
which q mate
Hmmm my embedded images don't seem to be working lately, can you see it now?

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

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
5. (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
6. (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
7. (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
8. (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
9. (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
10. (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?
11. (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.
12. (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
13. (Original post by Formless)
Ah okay, good luck for tomo mate
Good luck to you too!

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