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

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Reply 420

username1162972

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

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Reply 421

ertuu

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.

(edited 8 years ago)

Reply 422

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.

Reply 423

ertuu

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.

Reply 424

iceangel8

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 :smile:

At first I used ln0.8 and got a time less than the time constant and I was so confused phew I changed it!

Reply 425

bbyturtlexox

Original post by physicsmaths

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

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energy of photon

Reply 426

iceangel8

Question of the difference in times between the capacitor losing charge and energy anyone???

Reply 427

ertuu

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.

Reply 428

Nick.p97

Original post by bbyturtlexox

crikey

I think I might have been thinking about the wrong question my bad xD

Reply 429

username1162972

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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Reply 430

Dancatpro

I found it quite easy.

Quick tally at the end and I gave myself ~69/80

Reply 431

MangleKuo

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

Reply 432

iceangel8

Original post by ertuu

I got that the time for half the energy was greater than the time for half the charge.

Was so unsure about this one how'd you work it out?

Reply 433

bbyturtlexox

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?

Reply 434

Sayersss

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

Reply 435

johntoby

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