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re: HSC Physics Marathon Archive for those still awake, what time do you plan on sleeping?

re: HSC Physics Marathon Archive omg, that's like asking why 1 + 1 = 2.

You could hypothesize that when you graph T^2 vs length. The reciprocal of the graph multiplied by (4pi^2) would equal to g. Writing how you rearranged the pendulum formula might help.

closest is A though (4N) but the answer was B (8N)

I tried doing your first question and got 0.012 newtons o_O F = mv^2/r v = 2pi0.25/6.52 m = 0.05 r = 0.25 = 0.012 newtons. Where did you get this question from? I think it's wrong cause 8.5 newtons when dealing with such a slow speed and low mass doesn't sound right or maybe i'm just doing...

zzzzzzzzzzzzzzz they keep making mistakes, they keep using m/h instead of m/s. Gonna tilt during the exam cause of this.

zzzzz. Question 7 for space is wrong. They multiplied it correctly to turn it into metres/hour, but they forgot to divide it twice to change it to m/s

Basically validity is if what you're doing is correct. Validity in first hand investigations A valid experiment is a fair test (one variable is changed at a time). A method is valid if: - It investigates what you think it will investigate. The procedure tests the hypothesis and the experiment...

Thanks for this. I understood you're working, I just still have no idea what they mean by "equilibrium temperature". It would be a lot easier if they just asked what the temperature is for Vout = zero. Hopefully they word things differently in this year's exam :L EDIT: I understand that there...

I have another question Can you please help me with question a part v I don't really know what they're asking for in this question. http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2012exams/pdf_doc/2012-hsc-exam-physics.pdf

omg my bad.. idk how i read it incorrectly. thx sorry for wasting your time

https://www.physicsforums.com/attachments/capture2-png.90685/ This was BOS answer. When Xin <0.375 Yout is -16V not 16V Which is why im confused This was 2014 paper btw http://www.boardofstudies.nsw.edu.au/hsc_exams/2014/pdf_doc/2014-mg-physics.pdf

Can you please help me with this https://www.physicsforums.com/threads/op-amps-comparators.839399/#post-5267710

The test is in 3 days. I'm curious on how many people are doing it with me.

I found my mistake. I did v = 2(pi)r^2/T instead of 2(pi)r/t Thanks for that ^_^

When rearranged with Gravitational force = Centripetal force you get v= √(GM/r) but when you sub in orbital velocity into kepler's law of periods and you rearrange you get v= √(GMr) Can someone point out what I'm doing wrong?

Answer is A. Sin30 is required in this as the wire is not perpendicular to the magnetic field. Just note that if the magnetic field is going into/out of the page then in most cases it will be perpendicular to the current unless the current is also moving in/out of the page.

bump, still looking. Anyone else doing this topic this year? or planning on doing it?

I already got these note http://members.dodo.net.au/~phizz/ageofsilicon.html If you have some sources please share it with me. I also can't access the age of silicon chapter on this http://www.jaconline.com.au/physicsnsw/book2.html So if anyone has it please link me.