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My answer is D. The KE gained by the magnet is lost in GPE. Change in GPE = mgh = 0.98 J KE = 1/2mv^2 = 0.72 J Therefore, 0.26 J of the loss in GPE must have gone into electrical energy. It's wrong as you pointed out but I'd like someone to tell me why.

What's the difference?

I don't think it's that clean cut. They take into considerations do relative gaps between the ranks don't do (which becomes significant in a dodgy school with much variance).

surface area

Why not HSC papers?

he got you :P

Yeah I know what you mean. I have no proof, but I learnt all three: universal, induction, synchronous motor and have only encountered universal in an exam paper (and I've done many). Also, there is very limited information out there on synchronous (and to a lesser extent universal) whereas...

Just study the induction (asynchronous) motor and the "simple AC motor".

You're right, but think about this. As the disc rotates, the amount of magnetic flux threading any area on the disc is not changing.

AC allows for the secondary coils to experience a changing magnetic flux (since AC is always fluctuating), thus inducing emf --> current. DC dun do dis.

There are some iffy parts in your response hit patel. It's not that they are circular due to a lack of "wire" and it's not that their circular nature cause heat production. Don't like your response for electromagnetic braking either. Not sure if it was a rushed thing but yeah, just trying...

Not quite. EM braking relies on the metal disc experiencing a changing magnetic flux (achieved through either only a portion of the disc immersed in a magnetic field, or a changing magnetic field provided by electromagnets). In the above setup, it is not (since disc entirely immersed in...

Techniques are tools used by composers to convey meaning. By including them in your essay, it further supports your thesis by showing that X thesis is evident in the composer's Z intentions, not only Y textual evidence.

An essay argues a thesis. Textual evidence supports the thesis by showing that X thesis is evident in Y text. So what do techniques do? e.g. This notion is seen in Victor Frankenstein who is initially “imbued with a fervent longing to penetrate the secrets of nature.” vs. This notion is seen in...

How many hours did you study each day during the HSC? It seems like you didn't try that much. Would you say you owe your performance to natural aptitude?

I thought it was a very nice question (I was working with iStudent on skype). :P Past papers feel more redundant imo; rather have my algebra skills be pushed and break down on harder q's like this that are not 'mainstream'.

The answer is (x+1) (x^2-x+1) (x^4-x^3+x^2-x+1) (x^8+x^7-x^5-x^4-x^3+x+1) Note the similar elements to the form I expressed above :(

Factorise x^15 + 1 into four factors with real coefficients. Here's what I got: x^15 + 1 = (x^5)^3 + 1 = (x+1)(x^4-x^3+x^2-x+1)(x^10-x^5+1) and x^15 + 1 = (x^3)^5 + 1 = (x+1)(x^2-x+1)(x^12-x^9+x^6-x^3+1) Don't know what to do from here...

I've found that using picture books allows you to easily "bs" to support your thesis (since visual techniques are open to a wide of interpretations). Might be good for a second related text, if you are gambling on the HSC to ask only for one.

What's the difference between business, economics, commerce