r/ibPhysics

how was it?

I need to complete my physics hl syllabus in 7 days for dp1 finals is it possible to complete unit a, unit b, unit d in a week and get at least a 5. how should I delegate my time

Was anybody able to prove that the mass is 1400 kg or am I stupid?? I didn't know how to show that. Please tell me I'm not alone on this

PAPER TWO

Q1

(a) 

(i) (ii) Find direction of velocity and acceleration (2) -> a downwards vertically, v following line of path

(b) 

(i) Find t = 0.69s (2)

(ii) Find u = 7.7 ms^-1 (1)

Q2

LDR = 200k ohms, R = 50k ohms, connected in series

(a) Define ideal ammeter (1) -> no internal resistance

(b) Find current (2) -> 3.6 x 10^-5 A

(c) 

(i) Describe what happens to V (2) -> stays same

(ii) Describe what happens to P (1) -> increases

Q3

(a) Formation of absorption spectrum (3)

(b) Calculate energy difference, wavelength 514 -> 309, 6.06 eV (2)

Q4

(a) Difference between sun and red giant (1)

(b) Distance in light years (1) -> 8.8 light years

(c) Find Rx in terms of Rsolar (3) -> 0.011 Rsolar

(d) Last stage of evolution (1) -> white warf

Q5 

(a) Direction of magnetic field -> into the page

(b) Why is KE constant -> force does no work

(c) Find u -> 1.1 x 10^7 (2) 

(d) Why is gravitational effects negligible -> 10^12 magnitude difference (3)

Q6

(a) 

(i) Find speed -> 2.3 x 10^8 ms^-1 (2)

(ii) How does wavelength change (2) -> decreases since wavefronts compress

(iii) Does the light leave block at Q -> no, since 57 degrees > 50 degrees (3)

(b)

(i) Find acceleration -> 0.85 ms^-2 (3)

(ii) What happens to acceleration (1) -> decreases to zero as it reaches terminal speed

(iii) Draw FBD (2) -> upwards arrow of buoyancy, 2 downwards arrow of drag and weight (balanced)

(c)

(i) Find F -> 6.2N (1)

(ii) Find coefficient of dynamic friction -> 0.11 (2)

(d)

(i) Why is there a temperature gradient (2) -> conduction (reference molecules)

(ii) Find new temperature (2) -> -6.6 degrees

(iii) How else conduction (1) -> by friction

what do you guys think the grade boundaries will be for ib physics sl (tz2 cuz i’m from india) in order to get a 6 and a 7

Hi all, I'm planning to do my physics EE on a CFD analysis on L/D ratios and how they change with the aspect ratio of a wing. I'm gonna add some structural stuff possibly to enhance my discussion and the whole optimisation and balance thing but not sure. My main question is whether it's OK and not too hard to do well with a simulation based EE, and if so, how would I handle uncertainties as the sim doesnt give those? Do I even need them if I'm doing a simulation and mention my goa, is to investigate the theory? Any help is much appreciated, thanks!

p.s im using SimScale if that's of any help

Hello Guys! First of all I congratulate everyone with finally doing and finishing with Phsyics!

The question that bothers me a lot is about grade boundaries, what do you think what will happen to them?

Will they stay same at 67-69 or will drop / increase?

I am terrified about this and can’t think of what to expect, probably it is going to go a bit high for tz2 maybe even up to 70-72(unlikely to go to 75, but I am worried about it, what do you think is there any chance of it???)

I was sick, and terrify mismanaged time, ended up not answering some of the easiest questions that I could potentially answer. Literally free points. Expecting smth like 70/90 in paper 2, but terrified of grade boundaries jumping too high.

What were your experiences, how well/bad did you?

I am not asking to discuss the questions themselves but just thoughts on grade boundaries, and yeah 24 hours already passed for me I think.

Do yall think the grade boundaries will stay the same this year as last? Im worried quite some ppl are saying how paper 2 was easy but that balloon question and random ones about postulates of neutrinos ruined me... paper 1 was generally easier but I made so quite some stupid mistakes... all in all will the lower bound for 7 stay around 70% arguably?

Hi so basically I dont think it was possible to calculate the velocity of the proton travelling as when you used the formula for centripetal acceleration, there was no velocity given. Maybe there was a way to calculate this question if so please lmk.

I'm being deadass, I wrote the Paper 2 exam yesterday (m26) and I legit did so bad. I literally destroyed the laws of Physics bruv. My IA is also shit lol. I just wanted to get this off my chest so I can try and focus on other exams but god I failed so bad.

This is about Physics HL

24 hours have passed for everybody so i reconstructed the paper

https://limewire.com/d/Vha6I#OdiJfjhLZN

Help on making it more accurate. Any number any correction will be appreciated.

Without discussing exact word-to-word paper content, because honestly I'm quite scared of any consequences that may happen due to discussions even though IB's officially stated deadline has passed, what do you think the grade boundaries for this session would be?

I personally felt paper 2 was easy as chips and realized mistakes worth 9 marks that I made (Last question last two parts (used the wrong ratio), read the wrong angle for TIR (read 90 minus theta), calculated the wrong current in Q2, and messed that derivation for 'k' up in the Theme E question) due to being in a hurry/confused, whilst paper 1a was tricky yet doable and paper 1b was easy just like the past papers.

I'm confused as to which timezone the one in the title comes under; I'm aware it isn't 2, so is it Timezone 1 or 3? The grade boundary for a 7 was 67% for TZ1 and 71% for TZ3 in M25. I looked at the previous papers for those two TZs again, the MCQs there were doable whilst Paper 2 was pretty comparable in difficulty. Of course, M25 was the first examination session for the new syllabus, so that might've been a factor as well. What do you guys think the boundaries could go up to, if at all (I personally believe they will)? Never seen boundaries go up by more than 3% in two consecutive years, but could this be a first?

What do you guys think is the 'safe' boundary for each of the papers and the IA?

Thank you for reading this ultra long post, if you did.

How did it go?

I’m impatient and I wanna know if the answers I put are right or not. Ofc I remember very but still, we can discuss if you remember. But how was it in general?

In paper 2 for TZ2 one of the questions asked to calculate the radius of a proton going through a magnetic field, using centripetal force and qvB, only one velocity cancels out so you don’t have the velocity of the proton, were you meant to just give your answer in terms of V? Did I miss something?

Physics Sl

Is it possible that there were different paper threes based on timeozones this year (they usually have the same)? cause i dont remember the operations question for the second one?? if it helps im in the time zone where there was a balance sheet question on paper 2

also when it specified to use resource 2 and 3 and i didnt, how much do you think i will get penalized for it? like 0/6?

also, do you guys remember any other financial challenges mentioned other than the fluctuating price thingy on resource 3?

The mass we were given of the atom in the task in tz2 was it the mass diffrence or the pure mass of the atom