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Hi, i just wanted to know for software do you need to study any of the preliminary dot points. I have the preliminary textbooks and just wanted to know if i should make notes for or is it just a waste of time. If there is any prelim can you tell me how much there is

Thanks

Ok but what does the astronaut see, do they see everything slowly, if so how do they move more foward in time wouldnt they have to see everything go fast for that to happen

I am really getting confused about time dilation. What i am thinking is if you were an astronaut traveling at near the speed of light what would you see. Would you see time around you going slower or would you see time around you going faster. I would assume you would see time going slower. But...

So is anyone making physics preliminary dot points

So should i make any notes on the actual information such as reflection and refraction

Does anyone know how much of the preliminary topics are in the HSC. I have heard from people that 20% of the HSC is prelim work but the recent trials i did didnt seem to have any prelim.

Thankyou

OK thanx and what about the 23 and 18 were did they come from

Thank you so much but i dont really understand this part {[(30!)(20!)]/[(23!)(18!)]} what does that mean exactly (as i am in two unit and havnt seen this before) and were did the 23 and 18 come from? thx

Thank you i really appreciate you responses. I am sorry but i think i worded my question wrong. What i meant to day was without replacement. If you could help me solve this i will really appreciate it thx

Does anyone know?

thanks to they have to be aligned in a grid?

Alot of textbooks refer to a 'crystal lattice' and dont explain what it is. Does anyone know what it is?

Thanks heaps that last bit of info will help me a lot :). I know you have done alot to help me but if you have time how would you do really large replacement in equation from. Say in a hypothetical you 20 blue marbles and and 30 red marbles and you take out 9 marbles what is the probability of...

WOW! thanks heaps for that i cant believe i actually understood that you should get into the study guide writing business!. I just had one more question in my hypothetical i meant as in the probability of a rolling stuff like [5,5,6,6,6,6,6,6,6] , or [5,6,6,6,6,6,6,6,5] meaning you couldn't roll...

What does the ⁹C₂mean? Is there some kind of formula i can put these kind of questions into 

Could you explain it in a way a 2 unit person would understand

what does the c mean? how did you do it?

I wish i was encouraged i was in a slightly too low maths class to make it into 2 unit so i had to complete all this extra work to get into 2 unit. I also had to get above 65% on the first test or else they would drop me. But i proved them wrong getting 94% and beating all but two 3 unit...