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just z^n=1

Re: HSC 2013 4U Marathon New Question: $Find all the complex numbers$ \ z=a+ib, \ $where a and b are real, such that$ \ |z|^2 - 7 = 2i(z+2) \

My tutor students sat their exam (GPE, Work, Gravity, Projectile Motion) this week. I didn't make it too difficult this time (with the exception of a few questions). Attached is the paper. Note: I will not be posting answers :) More than welcome to PM me your answers or put in this thread...

Sarcasm mate ;-)

Shame on you Seanieg! Using mathematics to explain HSC Physics! Tsk tsk.

Enjoy! Remember, without Physics, there would be no x-ray diffraction! Congrats to those who have completed their examinations!

Well done to all who have now completed their HSC! :D lols to those who haven't.

Looking at circular motion, satellites and Keplers 3rd Law this upcoming lesson. If you don't mind the occasional (some would say, a little more often) bagging of Tasmanians, feel free to enquire!

We only look at motors which have a constant supply voltage, so whilst I wholeheartedly agree with both answers being correct (in REAL life), unfortunately, I would say that only D would be correct (in HSC life)

Dude, marking guidelines aren't decided upon until AFTER the examination, when they have gone through a few papers (I have never marked HSC, but this is what others have told me!)

Unless she is in the group of teachers who come up with the marking scheme for the question, her 'confirmation' means diddly squat! In terms of the syllabus, photocells and solar cells are two COMPLETELY different dot points, in two COMPLETELY different sections. Whenever the word...

No. 3 is a. Current down the wire, at the point where it is now, field lines to the left, RHP rule, force into page, viewed from above, would rotate clockwise

Actually, pretty awks for your PhD teacher when he is incorrect. Have a look at where that the dot point concerning photocells in the syllabus.. Before semiconductors.. Hmmmmmmm.... I wouldnt be surprised if they end up accepting both

I would still say D! He used that experiment to measure the speed of the generated radio waves

tbh, I didnt really read that question, lol. Will have a re-read now

You should NEVER rely on one source for your information! Always access 3 textbooks!

If a lot of people made the same mistake (which I am pretty certain will be the case, as photocells are not even taught at quite a few schools by the looks of it..) you could still be in with a chance

Look in the syllabus. They differentiate between solar cells and photocells Identify data sources gather, process and present information to summarise the use of the photoelectric effect in: - Solar Cells - Photocells

Photocells are pretty much the thermionic equivalent of solar cells. It consists of 2 electrodes embedded within a vacuum tube. A large cathode covered in photosensitive material, from which photoelectrons can be emitted when subject to sunlight.

My answers 1) b 2) d 3) a 4) a 5) d 6) c 7) a 8) d 9) b 10) c 11) b 12) a 13) d 14) b 15) a 16) d 17) d 18) c 19) c 20) b Torque one is tricky! But, the most correct answer would have to be D as net current through the coil would be decreasing due to Back EMF