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AC is continually going through the coil of an AC motor, hence even when it starts up the magnetic field is oscillating 50 times per second. In a DC motor, when you start it up the field is only changing as the coil turns, which is slow at first. As for the field changing direction, that...

Wait, what's this Back EMF question? (What year HSC?)

Yes indeed, support those good people from Aaron Butler publishing (sorry about the copyright violation guys) by purchasing SUCCESS ONE HSC PHYSICS and their many other excellent publications for other HSC subjects. This is an unpaid advertisement, and although people from that company...

Dean, (love the name) feel free to attempt postgraduate mathematics and quantum field theory at your leisure. The rest of us have the HSC to study for...

That's true; "Assess <name of topic>, 25 marks". "Ancient History Exam Writer" would be a pretty good job. As for topics, I'm doing NKE from A3 - R2; and Akhenaten for personality; I've decided to study only Akhenaten and pray to the Aten that there's a question on him in the period...

· Gather, process and present secondary information to discuss how shortcomings in available communication technology lead to an increased knowledge of the properties of materials with particular reference to the invention of the transistor · Identify data sources, gather, process, analyse...

Yes, if you were outside the rocket watching them, it'd seem to take 100 years for the rocket to get there.

I said 14 years because they only need to travel 14 light years, not 100, due to length contraction.

I'm not sure. It said time from the perspective of the people on the rocket, so I don't think you would, you just need to use the dilated distance.

AC generators: Advantages – can be supplied long distances as it can be stepped up and down, cheaper to supply, three phase power available, motors and generators are reliable with less moving parts. Disadvantages – Frequency limited to speed of rotation, constant back emf, people nearby may...

Length contraction formula (since length contraction also applies to the perceived distance to an object) lv = lo*sqrt(1-v²/c²) Distance to star as observed on rocket = 100*sqrt(1-99²) = 14.11 light years (2dp). t = s/v t = 14.11/.99 = 14.25 years. According to the people...

My best friend's dog's boyfriend's owner's cousin is the president of the Board of Studies and facsimile'd me the exam paper a year ago. ... Sorry, but I don't believe you. At any rate, if you're right, the test will contain this:

Yes, and no. Looks like I'm gonna fail another exam. Oh well, I never cared about my UAI anyway. Really! Edit: OMG my post count is 2/3 * the number of the BEAST!

No, people who are great in a subject do get tutors so they can be super-great.

If tutors weren't allowed, that would be highly communist, and communism is bad. Same thing with private schools. If you abolish all tutors and private schools and enforce strict standards to make sure all teachers are equal (???) it will still be unfair, because less intelligent people will...

I was gonna do some of those procrastinating challenges but... nah, I'll do them later.

I have a textbook for the old physics course, it consists of almost 100% mechanics, at a difficulty similar to that of 2 Unit maths. If the HSC course attempted to provide 'proof' of its content, then it would only be accessible to 4 unit maths students who had already completed the 3 unit...

E = hc/L, find E. p = nE/t, where n = number of photons Let t = 1, divide both sides by E n/1 = some number Is that right now?

What do you mean by 'hollow'?

Yes. Yes we can.