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re: HSC Physics Marathon Archive Questions: 1. Explain why Michelson and Morley expected a change in the interference pattern received by the detector of the interferometer. 2. A circular disc of conducting material is rotating clockwise. The bottom part of the disc is in a magnetic field...

re: HSC Physics Marathon Archive If you couldn't be bothered learning LaTeX, then you can just use the equation system on Google Docs (https://drive.google.com/), then use http://puush.me/ to take screenshots of it. Insert -> equation gets you started and there's a toolbar for a bunch of...

Why is your English so bad man? You're doing Advanced but your grammar is honestly the worst.

I'm pretty sure the current on that first diagram is going the wrong way. If you use the RHP rule - the right side of the coil is being pushed downward, so you switch your palm to make the force upward and the current travels down on the right side, not up.

Not sure, but I assumed they used raw marks (for accuracy) in my above post though. They most likely align everything last. Can't be too sure though.

Would any of this be correct? Physics cohort: 5 1: 92% 2: 91% 3: 85% 4: 70% 5: 60% Exam Marks | Moderated Assessment Marks: 1: 90 | 95 2: 93 | 94 3: 95 | 90/91 4: 85 | 81 5: 70 | 70 Range: 70 (~50% raw) -95 (~88% raw) = 38%. Range in marks at school: 60-92 = 32%. Therefore all marks are...

One thing I've learnt from this: I need to read and analyse questions a lot more carefully.

Nice explanation and solution, thanks :) That probably shouldn't have been a 1 mark multiple choice question though

Damn... I did horribly. 4/11. 1) yeah 2) yeah 3) didn't even think of that 4) you should post the solution :) 5) yeah 6) eh 7) didn't even think of that 8) yeah 9) what? 10) I see now 11) eh

Thanks :) I just realised my calculator was in radians for quesiton 8... wow

How do you work the question out anyway?

lol guessed 10...no idea what to do. I'd probably say 6 is D though, i thought it said EMF again instead of force

Tried it: 1. B 2. C 3. A 4. No idea, I'll say D 5. C 6. D 7. C 8. Not getting any of the answers, I'll say B 9. 0 10. A 11. C I probably got 0/11, 1/11 if I'm lucky. Edit: lol isn't Q9 just 0? It produces a net rotational torque but the forces cancel out right? http://puu.sh/2GbKE.png

Well OP you might be safe at top 10. But 54% at 8/40 kinda shows your cohort might be a little bad, so try and stretch it to top 5 if you can. And that's only half of it, you still need to perform well in the exam. Not sure how Victoria works though. Good luck anyway!

Were your exam marks better than your assessment marks though?

Given your top %'s and cohort sizes, then your ranks might be roughly: English: 8/40 Chem: N/A Maths: 24/80 Psychology: 4/60 Biology: 17/60 Going off your school rank and estimated ranks, a 95 ATAR isn't looking likely. You're going to need to get in the top 5 for Maths and Biology, and try...

re: HSC Physics Marathon Archive 5A anticlockwise through the loop?

Not really sure what you mean? I meant they're interchangeable because we're measuring from the origin (0,0) Like the x-coordinate and x-length are interchangeable, and the y-coordinate y-length are interchangeable. Obviously if you changed where the theta was positioned then how you'd find the...

Yeah I don't really get any of that lol, thanks for helping though! I just realised that the x and y coordinate ARE the lengths and are interchangeable. x-length (or coordinate) is cos and y-length (or coordinate) is sin, and since the radius is only 1 then it's only 1cos(theta) and...

Oh wait, I get it. I just had to think of projectile motion from Physics to understand haha!