# Search results

1. ### how many hours of sleep to function?

I mean I don't function even after 10 hours of sleep because I fall asleep in all my classes anyway but that's just me
2. ### 2012 HSC chemistry Multiple Choice

You never multiply the cell potential, only multiply whatever is in the half equation when your trying to make a full equation from the two half equations, which you don’t need to in this q anyway
3. ### 2012 HSC chemistry Multiple Choice

My chemistry knowledge is a bit rusty, but hopefully this makes sense. By calculating the oxidation numbers of Cr and Fe in the equation, you should see that Cr goes from a charge of 6+ to 3+ while Fe goes from charge 2+ to 3+, meaning that Cr is gaining electrons and therefore undergoing...
4. ### BE/ME Electrical Engineering vs B Engineering/B Commerce

Engineer, I thought commerce would be useful for having a degree in any situation but apparently that's not the case Now I understand most people do engineering and commerce because they are still unsure of what they want to do after uni
5. ### BE/ME Electrical Engineering vs B Engineering/B Commerce

Right, so if I was certain in doing engineering would commerce be kind of useless to study? Thanks for the reply
6. ### BE/ME Electrical Engineering vs B Engineering/B Commerce

Hi, I'm currently doing electrical engineering (BE/ME) at UNSW, but I'm not sure if I should continue with this or transfer to a dual degree in electrical engineering and commerce. Would a master's degree or double degree be better in this case for job prospects and what sort of jobs am I more...
7. ### How many of you guys play an instrument

Ayyy same here! Did you do AMEB grades in classical before you learnt acoustic and electric too?
8. ### Can someone please check my solutions and let me know where my mistake is

Your working out solves the area below y=e^-x, you need to find the area bounded between y=1 and y=e^-x
9. ### Incomplete Combustion

A and B produce CO2 which is complete combustion (Carbon soot/carbon monoxide is produced from incomplete combustion). D is incorrect because oxygen isn't balanced on both sides. Therefore the only correct answer is C
10. ### Please can someone check my solution I need the last step Q11d

Here is my working out https://i.imgur.com/4UKZC6m.jpg You need to use the fact that when x=0, f'(x)=0 too, as given where it says f(x) is horizontal as it passes through the origin

b) https://i.imgur.com/89enlCf.jpg

14a) https://i.imgur.com/3iLSnxN.jpg
13. ### 2017 HSC Marks Prediction Thread

Re: 2017 HSC Marks Thread 3u maths: 90 4u maths: 85 chemistry: 87 physics: 87 english adv: 70 being super harsh on myself so i don't get my hopes up lol, can't believe i can still get into (most) unsw engineering courses (over 92) with those marks when i put them into an atar calculator
14. ### relativity help

You don't need to, the velocity of all electromagnetic waves will be 3x10^8 regardless, since microwaves are a type of EMW the answers to both parts are basically the speed of light, doesn't matter which direction the spaceship is travelling or what it's relative to
15. ### Locus HELP!

Pretty sure the answer is wrong. If you want to go about the long way using distance formula, you can still work out the radius straight away r^2 = (6-3)^2 + (7-4)^2 r^2 = 9 + 9 r^2 = 18 Therefore equation of the circle is (x-3)^2 + (y-4)^2 = 18 And the radius of the circle is simply...
16. ### Phys/Chem Questions

7. Pretty sure this is beyond the scope of the course (like some of your other questions), but I happened to research this during my HSC too, I don't know the specifics but iirc the 4 hydrogen atoms do not fuse immediately, there is more than just one single reaction and between the reactions...
17. ### Phys/Chem Questions

Not sure if I understand what you're trying to say or maybe you're overthinking it. Might have to let someone else clear this question up since physics isn't my strongest subject anyway
18. ### Phys/Chem Questions

If you're talking about something like CH4 in terms of being the molecular formula of the compound, then no. CH4, C2H8, C3H12 are all different (C2H8 and C3H12 don't exist though as a side-note), but if CH4 is treated as an empirical formula then yes it's the same as C2H8 and C3H12.
19. ### Help with orbital question

Use W=Fs To find F, use F = ma F = 10000*9.8 = 98000 N s = W/F = 5.73*10^11/98000 = 5846938 m = 5847 km
20. ### galvanic help

I find that sort of notation confusing myself, but basically you should recognise platinum as an inert electrode that doesn't actually take part in the reaction, so the reactions that are taking place is the oxidation of magnesium and reduction of mercury. You are given the reduction...