# EDEXCEL Unit 5 Physics Discussions - IAL only

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Guyss discuss your exam here to avoid confusion! And for those of you that havent done it yet: Good luckk!

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#2

HOW DID IT GO???????????? grade boundary predictions?

here are the ones that stumped me:

1. for MCQ what did you pick for the dark energy question? dark energy is increasing the rate of universe expansion, therefore the universe is OPEN or INFINITE in size? I picked infinite in size.

2. most clueless question was probably the saturn ring question. what did you guys write?

3. how did you explain the one on why pressure increased upon impact with ground in terms of momentum

4. for energy lost from impact of ground did you get 0.6J?

5. was the new energy 299K (of the ball after impact with ground)

6. why wasn't there any questions on SHM....

7. property of the fission core's shield is needs to block out EM radiation and it is servenral meters of concrete...........is that right....

8. did you get smth like 21 days (or was it hours...) for time for saturn's rocks to rotate?

this paper is PACKED with calculations...seriously. but did you find it hard?

here are the ones that stumped me:

1. for MCQ what did you pick for the dark energy question? dark energy is increasing the rate of universe expansion, therefore the universe is OPEN or INFINITE in size? I picked infinite in size.

2. most clueless question was probably the saturn ring question. what did you guys write?

3. how did you explain the one on why pressure increased upon impact with ground in terms of momentum

4. for energy lost from impact of ground did you get 0.6J?

5. was the new energy 299K (of the ball after impact with ground)

6. why wasn't there any questions on SHM....

7. property of the fission core's shield is needs to block out EM radiation and it is servenral meters of concrete...........is that right....

8. did you get smth like 21 days (or was it hours...) for time for saturn's rocks to rotate?

this paper is PACKED with calculations...seriously. but did you find it hard?

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#3

1. Open universe

2. Doppler shift of side x moving away from us

3. Temperature increases as molecules get kinetic energy from ball, molecules have more momentum, greater impulse when colliding with walls of container, increases pressure.

4. Got the same answer

5. Same, got 299k

8. Yep got 21.1 hours

2. Doppler shift of side x moving away from us

3. Temperature increases as molecules get kinetic energy from ball, molecules have more momentum, greater impulse when colliding with walls of container, increases pressure.

4. Got the same answer

5. Same, got 299k

8. Yep got 21.1 hours

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#5

What was the answer for the mcq question asking about SHM?

I chose none of the energies.

I chose none of the energies.

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#7

(Original post by

What was the answer for the mcq question asking about SHM?

I chose none of the energies.

**Daniel Atieh**)What was the answer for the mcq question asking about SHM?

I chose none of the energies.

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#8

(Original post by

What was the temperature after impact? How did you approach it?

**Daniel Atieh**)What was the temperature after impact? How did you approach it?

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#9

(Original post by

yah i chose that too....but i think they are wrong...the total energy should be constant right?and for the first mcq what did you chose?person's position?

**saifulahmed**)yah i chose that too....but i think they are wrong...the total energy should be constant right?and for the first mcq what did you chose?person's position?

(Original post by

p1v1/t1=p2v2/t2

**saifulahmed**)p1v1/t1=p2v2/t2

What did you get exactly here?

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#10

(Original post by

I chose person's position. No i think it's correct, coz its not a condition for SHM.

same

What did you get exactly here?

**Daniel Atieh**)I chose person's position. No i think it's correct, coz its not a condition for SHM.

same

What did you get exactly here?

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#11

**Daniel Atieh**)

I chose person's position. No i think it's correct, coz its not a condition for SHM.

same

What did you get exactly here?

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#12

(Original post by

26'C

**saifulahmed**)26'C

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#13

(Original post by

in that question we had to find the mass of a planet, did you need the given mass?for me the given mass got crossed out in both questions.

**saifulahmed**)in that question we had to find the mass of a planet, did you need the given mass?for me the given mass got crossed out in both questions.

Why alpha particle gained most of the energy?

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#14

(Original post by

Really? Did you convert the units to Pascal from kPa and to m^3 from cm^3?

**AliNSiddiqui**)Really? Did you convert the units to Pascal from kPa and to m^3 from cm^3?

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#15

(Original post by

I really forgot what i did here. I think i used the equations separately, but i believe i got it correct.

Why alpha particle gained most of the energy?

**Daniel Atieh**)I really forgot what i did here. I think i used the equations separately, but i believe i got it correct.

Why alpha particle gained most of the energy?

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#16

(Original post by

i wrote as the alpha particle has a small mass it was emitted with more speed than lead nucleus to conserve the momentum, so it had more energy. i don't know if the answer is correct but some of my friends wrote the same thing.

**saifulahmed**)i wrote as the alpha particle has a small mass it was emitted with more speed than lead nucleus to conserve the momentum, so it had more energy. i don't know if the answer is correct but some of my friends wrote the same thing.

i meant tell me how you did it for the first one and the following part which asked for the difference?

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#17

(Original post by

Yeah i wrote something similar. And how did you find the energy in the next part for the gas laws?

i meant tell me how you did it for the first one and the following part which asked for the difference?

**Daniel Atieh**)Yeah i wrote something similar. And how did you find the energy in the next part for the gas laws?

i meant tell me how you did it for the first one and the following part which asked for the difference?

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#18

(Original post by

what was the first one?that find temperature?

**saifulahmed**)what was the first one?that find temperature?

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#19

(Original post by

no for the kinetic energy

**Daniel Atieh**)no for the kinetic energy

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#20

(Original post by

well you know the two temperatures, we just had to use the formula (del)Ek=(3/2)k(T2-T1)

**saifulahmed**)well you know the two temperatures, we just had to use the formula (del)Ek=(3/2)k(T2-T1)

The one just before the impact.

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