Physics Predictions/Thoughts (7 Viewers)

[svad]

View attachment 50498
26 is a good question lol, it required knowledge of the sine graph and how its only accurate at small angles

this question threw me off ngl

 

[svad]

1 a day for how many days is probably a more important question to work out how cooked you are

didn't he say he did all of them ?

 

[Trial&Error]

Predictions time I guess:

- Escape velocity calculation (3marks)
-Explain why Gravitational Potential Energy is negative?? idk maybe that's too "hard" (3marks)
-Observations and experiments using light have provided us with substantial information on other physics concepts which are not light. Analyse this statement (9marks)
-Photoelectric effect calculate stopping voltage (3marks)
-Analyse the energy changes of projectile motion and account for these changes (4marks)
-Analyse the limitations of the classical BB radiation curve and how Planck overcame them, include a graph (6marks)
-something about the conservation of energy in emission/absorption spectra (4marks)
-calculate the speed of light given experimental data of foucault/fizeu's experiment (4marks)
-something about the efficiency of transformers OR motors (5 marks)
-very, very basic dc motor calculation (3marks)

I think I should become a nesa exam writer lol.

 

[ogmvvs]

guys what are the chances they would ask about a specific method in measuring light where u can't js simply describe them briefly? like i dont know nothing about ole romer's one

 

[svad]

-Explain why Gravitational Potential Energy is negative?? idk maybe that's too "hard" (3marks)

they already did this didn't they?

 

[Trial&Error]

they already did this didn't they?

idk i havent done all the papers yet

 

[coolcat6778]

Bruh if they actually add " Explain why Gravitational Potential Energy is negative (3marks) "
this will piss me off, there's no need to explain, it's literally integral calculus
W = Fs = ∫ F ds

W = ∫ GMm/r^-2 dr
= -GMm/r

I don't even understand those stupid explanations. Just show them how to derive it with calculus if they do ask it lol

 

[svad]

guys what are the chances they would ask about a specific method in measuring light where u can't js simply describe them briefly? like i dont know nothing about ole romer's one

easiest one: Talk about Galileo's method of finding the speed of light. Unless it specifically asks for a reliable and accurate method

 

[Trial&Error]

guys what are the chances they would ask about a specific method in measuring light where u can't js simply describe them briefly? like i dont know nothing about ole romer's one

They won't specify because there's nothing specified in the syllabus but they might ask you to describe one of your own choosing

 

[Tony Stark]

I'm definitely not doing well in this exam...I can't focus because there's a bird mite infestation and bugs are crawling on my skin, I have a headache because I think I'm dehydrated, and I think I've forgotten too much.Bismillah alrahman alrahim

 

[svad]

and bugs are crawling on my skin

omg what?? How are you not panicking?

 

[Tony Stark]

omg what?? How are you not panicking?

I can pretend its all sunshine and rainbows.

 

[svad]

I pray it's like 2021

 

[BionicMango]

Bruh if they actually add " Explain why Gravitational Potential Energy is negative (3marks) "
this will piss me off, there's no need to explain, it's literally integral calculus
W = Fs = ∫ F ds

W = ∫ GMm/r^-2 dr
= -GMm/r

I don't even understand those stupid explanations. Just show them how to derive it with calculus if they do ask it lol

Noncalculus method: U increases as r increases, U becomes zero as r approaches infinity. Thus, U must be negative.

Prefer the calc way though

 

[Trial&Error]

I'm definitely not doing well in this exam...I can't focus because there's a bird mite infestation and bugs are crawling on my skin, I have a headache because I think I'm dehydrated, and I think I've forgotten too much.Bismillah alrahman alrahim

What?? Are you okay?? Get a good rest tonight cause it seems like hsc has really eaten you through. Just remember its going to be over soon. We'll finally be freeeee!

 

[v.tex]

HSC explanation on the Ultraviolet catastrophe is so limited

 

[BionicMango]

HSC explanation on the Ultraviolet catastrophe is so limited

From the research I have done this is a basic explanation as to why quantisation solve the uv catastrophe.

Quantisation means that light is made up of discrete packets with discrete amounts of energy. The energy of each photon is hf. The higher the energy of light (represented by the area under the black body curves) the less photons are required to produce that frequency. Thus there will be a cutoff frequency where only one photon would be required to produce that frequency. That produces the correct curve.

Without quantisation, there is no reason to be a “cut-off” so that results in infinite frequencies being considered.

Incredibly basic calculus explanation: some integrals converge with discrete models but diverge with continuous models, resulting in the two distinct curves we see.

for more information this reddit post helped: https://www.reddit.com/r/explainlikeimfive/comments/v0t83j Also search up Boltzmann equation, Rayleigh-Jones equation, & equipartition theorem.

 

[BionicMango]

Also this website is helpful: https://physicsworld.com/a/max-planck-the-reluctant-revolutionary/

 

[v.tex]

Seriously though, how much should we know for the big bang?? Its only one dot point. Surely they wouldn't give a 9 marker on that shit. Like I ain't remembering every time period.

 

[C2H6O]

Seriously though, how much should we know for the big bang?? Its only one dot point. Surely they wouldn't give a 9 marker on that shit. Like I ain't remembering every time period.

i seriously doubt they would require times. just talk about separation of forces, baryogenesis, big bang nucleosynthesis, recombination and expansion. at most recombination was after like 380k years i think.