GCSE OCR 21st Century Triple Science (CBP1-7) Thread

I messed up on the p4 section I lost like 6 marks fgs how did you work out the momentum I was so confused and I just talked about everything I could for Amir ad his stupid jump except gpe didnt see how that made him jump further it's just stored kinetic energy isn't it

Reply 1621

Swag>education

1

Shoutout to my homie krollo for helping me this morning ily

Reply 1622

Sulfur

OP

Original post by iodqwm

wasn't it 135 for the top and 52/42 for the bottom ( i forgot which one)

I thought it was 132 for top and 40 for bottom? I can't remember if they were my answers to be honest, but I think 40 was one of them and the other ended in a 2?

Reply 1623

Amyjonesx

2

Original post by Swag>education

I messed up on the p4 section I lost like 6 marks fgs how did you work out the momentum I was so confused and I just talked about everything I could for Amir ad his stupid jump except gpe didnt see how that made him jump further it's just stored kinetic energy isn't it

I got 0.4 for the momentum one but i think its wrong :frown:

Reply 1624

username1344042

6

Original post by Sulfur

I thought it was 132 for top and 40 for bottom? I can't remember if they were my answers to be honest, but I think 40 was one of them and the other ended in a 2?

I put 135 over 40

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Reply 1625

Pandorax

11

Guys what did you say for the first two six markers?

I said something about momentum, gravity and chemical energy or something for the first one :s

Then for the second one I said that the wires were smaller so needed less energy/energy more powerful, uh and the ion particles in wires collided with the wires beforehand creating more energy for the filament lamp? DX I kinda guessed those two

Reply 1626

Sulfur

OP

Original post by Swag>education

I messed up on the p4 section I lost like 6 marks fgs how did you work out the momentum I was so confused and I just talked about everything I could for Amir ad his stupid jump except gpe didnt see how that made him jump further it's just stored kinetic energy isn't it

I think the change in momentum question was 0.4kg?
(0.2x6)-(0.2x4) or simple (0.2x2) = 0.4kg

Original post by Fyt

Section a (card) can detect both beta and gamma but not alpha as alpha is stopped by thin paper. Section b (aluminium) can be used to detect only gamma as the aluminium blocks the beta but not the gamma. The thing that tha had to be kept in mind is that the detecting material was behind the different sections so the radiation first needed to pass the sections. This is why the next question said that alpha rays can't be detected. It is because all three materials stop the alpha particles so they are never able to reach the detecting material behind the 3 sections.

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So saying:

Beta - Section A and B
Gamma - Section A only would be 1/2 do you think?

Reply 1627

Sulfur

OP

Original post by olmyster911

I put 135 over 40

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I think I put 132 because the neutron had a 3 in front of it so maybe I did 135-3 = 132. I'm pretty sure 135 will be right then.

Reply 1628

ColeNate

7

How do you guys write so much for each question? I find that there is NEVER enough space, especially on 6 markers.

Reply 1629

Krollo

17

Surely the change in momentum was 2 kgm/s? As it is velocity you have to take into account the reversal of direction, don't you? I may be wrong.

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Reply 1630

Sulfur

OP

Original post by ColeNate

How do you guys write so much for each question? I find that there is NEVER enough space, especially on 6 markers.

I just wrote over the lines for P4, on the final line for P5 and a couple of lines over/extra paper for P6

Reply 1631

ColeNate

7

Original post by Sulfur

I just wrote over the lines for P4, on the final line for P5 and a couple of lines over/extra paper for P6

Ah, fair enough. A good strategy would be to ask for 1 extra sheet of paper before the exam starts as the 6 mark lines don't really accommodate QWC and science.

Reply 1632

Student.178

9

Did anyone else write a essay on the radioactive waste? Lol I wrote about 2 sides for that but I'm bit worried now as it was only a 6 marker so I shouldn't have wrote that much :smile:

Reply 1633

g.l.a.4559

Original post by mehtj006.310

Here are is the B7 paper from 2013.

thank you x

Reply 1634

username1344042

6

Original post by Sulfur

I think I put 132 because the neutron had a 3 in front of it so maybe I did 135-3 = 132. I'm pretty sure 135 will be right then.

Ahh ok it was only worth a few marks anyways

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Reply 1635

ToLiveInADream

17

...well I'm late to this thread for once because of a maths mock in prep for tomorrow! Ah well. Overall how was it? I found it a hell of a lot easier than I expected and it was really short?

Reply 1636

Invest

14

Yeah it was easier than I expected but I barely finished. I had so much to write for the final 6mark but could not due to time.

Reply 1637

Fyt

What was the answer to the change in momentum question. I put 0.4 but can anyone say with confidence that it was right.

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Reply 1638

Sulfur

OP

Original post by Fyt

What was the answer to the change in momentum question. I put 0.4 but can anyone say with confidence that it was right.

Posted from TSR Mobile

Sadly I can't say with confidence no, but I can tell you that the people that I asked also got that. You could've calculated it by doing the first momentum (6x0.2) - the second momentum too (4x0.2) which is another way to do the change I believe.