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Ewwwwwww @ PIF explanation. From what is said here it seems like they are assuming Fc to be constant, which is of course untrue (assuming a stable circular orbit) as Fc is provided by Fg, which is inversely proportional to r^2. If a satellite is travelling at any speed other than its orbital...

re: HSC Chemistry Marathon Archive A galvanic cell was set up using (amongst other things) copper electrode, magnesium electrode, 100mL 1M Copper Nitrate solution and 100mL 1M Magnesium Nitrate solution After a few minutes, student takes apart the galvanic cell and notices that a solid deposit...

With the second equation, you can only say that v would increase with 'r' if T is constant, which it is not. We know from Keplers 3rd Law that r^3 is proportional to T^2. So, if r increases, then T would also increase by by r^3/2 Then this would end up showing that v is still inversely...

re: HSC Chemistry Marathon Archive Have a look at the periodic table, you lazy bum! It is Z > 95, so tell me what has to happen for those elements to be created :)

re: HSC Chemistry Marathon Archive Compare the methods of production of neptunium and curium (2 marks)

Thanks for kind words, people! :) 2015 classes are all filled now. 3 spots left for 2016 HSC

re: HSC Physics Marathon Archive That's not the answer, but it is part way there :)

re: HSC Physics Marathon Archive I think you forgot to halve it ;) But correct process :) Here is one my tutor students struggled with in their examination New Question: (There was a diagram to go with it, but it makes sense without it) Two clocks are started simultaneously. A...

re: HSC Physics Marathon Archive Correct working, but I end up with a value of 6390km? New Question: Determine the work required to accelerate an electron from rest to 0.98c (3 marks)

re: HSC Physics Marathon Archive por que? How did you arrive at your asnwer for 'r'?

re: HSC Physics Marathon Archive New Question: Beginning with the Law of Universal gravitation, derive a formula that can be used to calculate the approximate radius of the Earth using data provided on your formula/data sheet. Calculate this value. NB: If you EVER need to use radius of...

re: HSC Physics Marathon Archive Hey funnytom, I would suggest that using N1L, you could say something along the lines of 'seeing as the velocity of the craft is towards the Earth, then according to N1L, in the absence of a net force it will continue to move towards the Earth.' Then say...

re: HSC Physics Marathon Archive Hey funnytom, I would suggest that using N1L, you could say something along the lines of 'seeing as the velocity of the craft is towards the Earth, then according to N1L, in the absence of a net force it will continue to move towards the Earth.' Then say...

re: HSC Physics Marathon Archive Should be ~0.91c

re: HSC Physics Marathon Archive Should be ~0.91c

re: HSC Physics Marathon Archive It's quite a difficult question! Essentially, it wants you to justify the statement made by Jim Lovell, in order to do this, you must explain how Newtons Laws apply to the motion of the craft after the rockets engines are extinguished.

re: HSC Physics Marathon Archive You all are misinterpreting the Newton question! It says for the period AFTER the rocket burn was completed. You should not mention ANYTHING about expulsion of gases as this would be DURING the rocket burn

re: HSC Physics Marathon Archive I see it being beneficial both ways. Others can read your responses and hopefully gain some insight, likewise, feedback can be given to you if there are areas of your own response lacking in sufficient detail or misconceptions etc.. They have ultimately been...

re: HSC Physics Marathon Archive Answer it the way you would in an examination! That is the only way you will gain valuable feedback cuz if you cbb answering the question completely, I (and presumably, others) cbb giving feedback and any feedback given will not be valuable as it is not an...

re: HSC Physics Marathon Archive Having a look at the question, where it says it takes 3s to go a further 4m, that impossible assuming g =-9.8ms^-2. I get no real solutions for g =-9.8! Show me working! I am able to get the 9.1m, but that involves an algebraic mistake. Are you sure it is...