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

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1. Fkr the e=mc squred in MC what was the answer?

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2. (Original post by physicsmaths)
Fkr the e=mc squred in MC what was the answer?

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I put D for that one. I think that's wrong though. It was probably the annihilation one.
3. Alright paper. Could have been better but could also have been a lot worse.

What did we get for the tension? I got about 41° and something like 0.03N.
4. (Original post by jay_em)
Alright paper. Could have been better but could also have been a lot worse.

What did we get for the tension? I got about 41° and something like 0.03N.
Yes! I got the same. For T I got 0.035 N.
5. (Original post by The Best1)
yeah i just remember putting 7s, dont remember what decimal points, 7.08 sounds like what i put!
Ah k awesome At first I used ln0.8 and got a time less than the time constant and I was so confused phew I changed it!
6. (Original post by physicsmaths)
Fkr the e=mc squred in MC what was the answer?

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energy of photon
7. Question of the difference in times between the capacitor losing charge and energy anyone???
8. (Original post by iceangel8)
Question of the difference in times between the capacitor losing charge and energy anyone???
I got that the time for half the energy was greater than the time for half the charge.
9. (Original post by bbyturtlexox)
crikey
I think I might have been thinking about the wrong question my bad xD
10. (Original post by ertuu)
I got that the time for half the energy was greater than the time for half the charge.
I got opposite.

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11. I found it quite easy.

Quick tally at the end and I gave myself ~69/80
12. (Original post by iceangel8)
Question of the difference in times between the capacitor losing charge and energy anyone???
I wrote less.

Because E=1/2 Q2/C and C is constant
Hence E = kQ2
for E become 1/2 E
Q need to become 1/√2 Q
1/√2 ≈ 0.7
Q reaches 0.7Q0 before reaching 0.5Q0
So the time is less
13. (Original post by ertuu)
I got that the time for half the energy was greater than the time for half the charge.
14. (Original post by Nick.p97)
I think I might have been thinking about the wrong question my bad xD
the roundabout question at the start. what was the time?
15. (Original post by iceangel8)
Question of the difference in times between the capacitor losing charge and energy anyone???
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
16. I got 3s for the roundabout, and that mass didn't change it, anyone? Can someone explain that one asking for the capacitor time to lose half energy and half its charge? That was the only one I was unsure of
17. (Original post by bbyturtlexox)
the roundabout question at the start. what was the time?
Just over 3 s
18. (Original post by bbyturtlexox)
the roundabout question at the start. what was the time?
I got 3.03s???
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
ffs of course
20. I got 0.5075s but my friends got around 3s so i think i went wrong somewhere

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