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Just be careful when saying DC cannot be used, as it is true that a TRUE or STEADY DC source cannot be used (constant positive voltage/current), whereas VARYING DC, which is somewhat similar to an absolute value sine graph (non-constant positive voltage/current) could be used as the...

Some Types of superconductors are able to have large currents flow through them. As you know (hopefully!) when current flows through a conductor, that current produces a magnetic field. Basically superconductors are used like electromagnets, but due to zero resistance, they are able to have...

Nope! If there was a double bond between the two C's then they would be geometric isomers, but this is beyond the HSC course

One of my students was ranked 100+ in preliminary physics at Baulko (Exact rank escapes me atm, but it was around 116?). He ended up equal second in Physics, ATAR of 99.80. I told him in the first or second lesson I had him that he could state rank. He nearly got there. The guy who he was...

T = 5 \times 10^7 m = 2.5\times10^6(0.25) a = \frac{T-mg}{m} a = \frac{5 \times 10^7 - (2.5\times10^6(0.25) \times 9.8)}{2.5\times10^6(0.25)} a = 70.2

The net force acting on the rocket is Thrust - Weight, not just thrust.

re: HSC Chemistry Marathon Archive Irony that the 'your' should be 'you're' ?

You are told that it is a condensation polymer (i.e., water (usually) is lost as a by-product) So, think about how you can join the monomers together and eliminate H2O in the process :)

re: HSC Chemistry Marathon Archive Convert from mol L^-1 to g L^-1 by multiplying by the mass of the chloride ion

re: HSC Chemistry Marathon Archive CaCl2 --> Ca2+ + 2Cl- [Cl- ions] = 2x [CaCl2] [Cl-] = 3x10^-3 mol L^-1 Mass Cl- = 3x10^-3 x 35.45 = 0.106g L^-1 = 106mg L^-1 = 106ppm

re: HSC Chemistry Marathon Archive Pipette / Burette must be rinsed with water then solution. Conical flask just water.

I think you ar misreading or misinterpreting the question. Moving towards the Earth but decelerating at 50m/s^2 is the same thing as moving away from the Earth and accelerating at 50m/s^2.

You should be adding them, not subtracting. If it is moving towards Earth, but decelerating, then the acceleration is opposing the motion of the craft (and opposing acceleration due to gravity!). So, the 'relative acceleration' is 50 + 9.8 = 59.8, therefore weight = 59.8 x 90 = 5382N. It...

Thanks :) Still space ppls! In everyone's best interest to start right at the beginning, rather than trying to play catch up!

Number of sig figs in concentration of H+ = number of decimal places in pH I.e., 5.5x10^-3mol L^-1 of H+ would be pH = 2.26 This is a special case which is common to logarithms

Classes starting next week. 1 spot still available in my Tuesday class. Possibly 1 spot available in my Saturday 11:30am class! - Experienced (9 years) Physics & Chemistry teacher - Current HSC marker (Physics) - unrivalled resources - unrivalled good looks (for a nerdy physics tutor -- it's...

Please see attached. It is from 2009 HSC. Note: they used nBil * d where d is distance from axle to coil in the field. No guarantee success one will be right btw, lol.

It actually does matter! This question wanted you to equate torque of ONE SIDE OF THE COIL ONLY!! It wanted to assume that the magnetic field lines had spread out. Notes from marking centre for that question Weaker responses demonstrated some misunderstandings regarding torque and force...

First one would definitely be C. It has nothing to do with eddy currents. Second one I am a bit iffy about. I would say that the HSC wants us to say 'A', but it doesn't really give a correct cause and effect. On the other hand, C gives a more correct cause and effect (and a more correct...

Seems like I may have either 1 or 2 spaces in my Saturday 11:30am-1:30pm class. Contact me if interested :)