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AQA A-level Physics Paper 2 (7408/2) - 9th June 2023 [Exam Chat]

Ngl I actually didn't mind paper 1 because I'm a lot better at problem solving rather than learning a million definitions and random stuff like what pattern can be seen on a diffraction grating

Reply 21

Abdullah05

5

Hey can anyone help me with this question:
Sea level is currently observed to increase at a total rate of about 3mm/year. Out of this total rate, approximately 1mm/year is due to thermal expansion of the warming sea water. This is known as steric sea level change.
Assume that the ocean heating occurs uniformly over the top 1000m of the ocean at a rate of 0.01∘Cyear−1. Calculate the power required for this ocean heating.

Assume that the Earth is a perfect sphere with radius 6371km
The oceans covers 70% of the Earth’s surface
The density of sea water is 1025kgm−3

The heat capacity of sea water C, =4.006×10^3Jkg−1K−1

This is what i did. i kinda just waffled.

Preview attachment 20230529_180236.jpg

20230529_180236.jpg
1.5 MB

Reply 22

Abdullah05

5

Hey can anyone help me with this question:
Sea level is currently observed to increase at a total rate of about 3mm/year. Out of this total rate, approximately 1mm/year is due to thermal expansion of the warming sea water. This is known as steric sea level change.
Assume that the ocean heating occurs uniformly over the top 1000m of the ocean at a rate of 0.01∘Cyear−1. Calculate the power required for this ocean heating.

Assume that the Earth is a perfect sphere with radius 6371km
The oceans covers 70% of the Earth’s surface
The density of sea water is 1025kgm−3

The heat capacity of sea water C, =4.006×10^3Jkg−1K−1

This is what i did. i kinda just waffled.

Preview attachment 20230529_180236.jpg

20230529_180236.jpg
1.5 MB

Reply 23

Felix'sfreckles

13

What level of difficulty in Isaac physics would you guys recommend we should be able to do if we're aiming for a solid A*?

Reply 24

Kingemperor07

11

Original post by Felix'sfreckles

What level of difficulty in Isaac physics would you guys recommend we should be able to do if we're aiming for a solid A*?

Any of the challenge tasks are very good and really force you to think logically and methodically, just make sure to always draw a detailed diagram for any questions and identify any quantities that are given in the the question along with the quantity(s) to find :smile:

Reply 25

Felix'sfreckles

13

Original post by Kingemperor07

Any of the challenge tasks are very good and really force you to think logically and methodically, just make sure to always draw a detailed diagram for any questions and identify any quantities that are given in the the question along with the quantity(s) to find :smile:

Alright, thank you!

Reply 26

Kingemperor07

11

Original post by Abdullah05

Hey can anyone help me with this question:
Sea level is currently observed to increase at a total rate of about 3mm/year. Out of this total rate, approximately 1mm/year is due to thermal expansion of the warming sea water. This is known as steric sea level change.
Assume that the ocean heating occurs uniformly over the top 1000m of the ocean at a rate of 0.01∘Cyear−1. Calculate the power required for this ocean heating.

Assume that the Earth is a perfect sphere with radius 6371km
The oceans covers 70% of the Earth’s surface
The density of sea water is 1025kgm−3

The heat capacity of sea water C, =4.006×10^3Jkg−1K−1

This is what i did. i kinda just waffled.

Preview attachment 20230529_180236.jpg

20230529_180236.jpg
1.5 MB

A)
Calculate the area of the ocean:
- SA of earth = 4 * pi * r^2
- SA of ocean = 0.7 * SA of earth
Calculate the mass of the ocean heated:
- p = m/V, m = pV = pAL
- p = density of sea water, A = SA of ocean calculated, L = the depth of ocean heated
Use specific heat capacity eq:
- Pt = mcT
- P = mc(T / t), remember that T / t refers to 0.01 degrees celsius / year rate of temperature increase of ocean.

B)
The objective is to find dm/dt
Calculate the accumulated volume each year due to ice melting:
- V/dt = (SA of ocean) * (2 mm/year)
Use density equation:
- p = dm / V, V = dm / p, dividing both sides by dt: V / dt = dm / (dt * p)
- Therefore dm/dt = p * V/dt

C)
Form an expression for the total Power:
- P = (mcT + mL) / t
- therefore P = (dm/dt)*cT + (dm/dt)*L
- You might notice that dm/dt appears in this equation again, just sub all the values from the question along with dm/dt from the previous question to get P

OP

Original post by vishal2479

do any of you remember any questions from paper1 and paper2 physics as 2023

Is this for mocks or did you sit this exam?

Reply 28

le0widx

5

Could someone help me with this question please:

https://isaacphysics.org/questions/SHM_Wire_Loop?board=c2c10c57-0dc0-4550-ba62-55a17e777877&stage=a_level

I first worked out the tension in the spring in terms of B, which was (5x10^-3)B + 0.0981 N . From there I used hookes law to calculate the spring constant, which was 5B + 98.1 N m^-1 . Then I used the formula T = 2pi (m/k)^1/2 to work out B. Anyone know what I did wrong? Thanks :smile:

Reply 29

Polp

12

Yall reckon this paper gonna be harder than/at the same difficulty compared to paper 1? Tbf im better at paper 2. I looked at 2022 paper and tbf there was a bit of everything really so predictions probs wont be great but if i were to give a prediction then probs some more electric fields and capacitance so I would have a gander at those. There was a decent chunck of gravs and thermal in 2022 but hey it could be anything so take what I said with a grain of salt.

Reply 30

Kingemperor07

11

Original post by Polp

Yall reckon this paper gonna be harder than/at the same difficulty compared to paper 1? Tbf im better at paper 2. I looked at 2022 paper and tbf there was a bit of everything really so predictions probs wont be great but if i were to give a prediction then probs some more electric fields and capacitance so I would have a gander at those. There was a decent chunck of gravs and thermal in 2022 but hey it could be anything so take what I said with a grain of salt.

I'm assuming that Paper 2 will be easier simply because we learnt it more recently, but AQA always finds a way to make things harder than it needs to be so idk.

Reply 31

Kingemperor07

11

I've been stuck on these Isaac physics questions for some days now, does anyone know how to solve these:
- https://isaacphysics.org/questions/two_cs_three_rs?board=709e4d70-11ca-40da-9e63-ae6f9ce02e8d&stage=a_level
- https://isaacphysics.org/questions/electric_shapes?board=e27720fa-0362-4e87-9500-bb1f3f66375a&stage=a_level

Reply 32

Josh1234543

Is paper 2 more calculation or theory based?

Reply 33

Polp

12

Original post by Josh1234543

Is paper 2 more calculation or theory based?

I reckon there will be more theory cause there was lots of problem solving in paper 1 but hey it could be even more problem solving lmao.

Reply 34

Ak_5

4

Does anyone know what equations we'll need to memorise that we aren't already given?
alot of the equations for paper 2 are already in the datasheet

Reply 35

malymole1

9

Original post by Gbbhytr

Yo would anyone be interested in a group buy for the paper 2 paper, I have a plug who's charging 500, obvs I can't pay that but if people chip in well probably have to pay like 20 each, if anyone is interested and has friends who are interested please message me

Get the **** out of here man

Reply 36

Gbbhytr

3

Original post by malymole1

Get the **** out of here

Alright bro

(edited 10 months ago)

Reply 37

swnap

6

howww do i revise for this paper. its so confusing

Reply 38

malymole1

9

Original post by swnap

howww do i revise for this paper. its so confusing

Try physics and maths tutor, its rlly good. They have so many questions for every single specific topic you want to revise. Even the answers to the multi choice questions have detailed writing explaining how to do them

Reply 39

Ak_5

4

https://isaacphysics.org/questions/bringing_to_the_boil?board=1b562310-1f71-4d5f-8930-7b825670eb59&stage=a_level

can someone help me with this i have no clue whats going on

AQA A-level Physics Paper 2 (7408/2) - 9th June 2023 [Exam Chat]

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