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If someone in second place is behind first by about 2% by the time all internal assessments are over and this person performs better externally than the person ranked first, who gets the better final hsc mark? Cheers guys.

Thinking about it again actually, I think it's A (call me crazy). I don't think either changes would cause a change in the V-t graph.

With q11), since it says the EMF induced in the coils, wouldn't the correct answer be B? I'm thinking it would be D if you're talking about the EMF in the external circuit.

The balls have to be in different colours though i.e. one must be white, one must be yellow and one must be purple. So wouldn't it be 3!=6?

Re: HSC 2013 4U Marathon Yeah, both are correct expressions for the primitive.

Re: HSC 2013 4U Marathon Go to sleep bro, you're off your ass.

Can someone also answer this please? An alarm clock is set to go off in one hour when at rest. The alarm clock is set in motion at 0.99 times the speed of light Calculate how long it would take the alarm to go off for the stationary observer watching it move away at 0.99c

If you see someone moving at a speed close to the speed of light in a train and they walk through the train, would they appear to be moving in slow motion or not?

lol, I thought it was 0 and was wtf'ing.

re: HSC Physics Marathon Archive Is it the change in the mechanical energy of the satellite?

HCl(aq)+NaOH(aq)->NaCl(aq)+H2O(l) n(HCl)=0.1*0.25=0.025 mol n(NaOH)=0.025*0.25=0.00625 mol Hence, the limiting reagent will be the aqueous NaOH solution since we have less moles of it and because for every mole of HCl that is neutralised one mole of NaOH is neutralised. After the complete...

re: HSC Chemistry Marathon Archive Assess the evidence which indicates increases in the concentrations of sulfur and nitrogen oxides in the atmosphere.

Does that mean that no HCO3- ionisation occurs?

My max is around 67 but I usually get like 40.

Hey Aysce, with the part I bolded don't you mean strong conjugate base? Don't weak acids, in general, have strong conjugate bases.

re: HSC Chemistry Marathon Archive By definition, pH=-log[H+] pOH=-log[OH-] At 25 degrees C, [H+][OH-]=10^(-14) Taking the common log of both sides: log[[H+][OH-]]=log[10^(-14)] log[H+]+log[OH-]=-14 -pH-pOH=-14 pH=14-pOH

re: HSC Chemistry Marathon Archive pH=-log[H+] where log is of base 10. [H+]=10^(-pH) =10^(-12) M=10^(-12) mol/L so that's the hydronium ion concentration of the solution. Now, at RTP, [OH-]*[H+]=10^(-14) from that we get [OH-]=10^(-2) M KOH->K+ + OH- so [KOH]=[OH-]=10^(-2) M...

yeah, that's right.

Torque is the instantaneous rate of change in angular momentum, the rotational analogue of linear momentum. Angular momentum is well defined as r*p (cbf using vector notation) and so when you differentiate with respect to time you get τ=d/dt(rp)=r(dp/dt)=Fr (obviously I assumed that the radius...

I'd draw an arrow to point out the direction of the force showing that it's perpendicular to the current but I'm not sure about this.