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It was a bad question because the diagram didn't show the section of the motor where the split ring commutator would've been located. However, because the question said that it was a DC motor, you can infer that a split ring commutator was there

I got 38/3 u^3

Ah shit, I was thinking in my head that tantheta = h/r for some reason. Ah well, another mark lost

How did everyone prove theta > pi/4 I let N > 0, so theta > h/r, didn't know where to go from there

Damn. Are you sure? Isn't 'a' theoretically defined as the length of the semi-major axis so it can't be negative?

Re: HSC 2018 MX2 Marathon i) x^2+y^2=1 ii) x^2+(y-im(z))^2=1 I've probably misinterpreted the question given it does seem overly simple

it was asking me to prove x = f(y) and in a previous part, we had proved x = 2tana I simply proved that f(y) = 2tana = x Is that assuming the result?

Have a question regarding proofs using results. On the CSSA Trial Paper this year, I got 0/3 for q15 a.v. (The tan^2x +1 = sec^2x) one. I proved the result by subbing the values into RHS and proving RHS = x1 rather than expanding x1 so that x1=RHS Technically though, I answered the question...