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Not necessarily. For example U-234 undergoes alpha decay to form Th-230 which then undergoes alpha decay to form Ra-226, alpha again to form Rn-222, alpha again to form Po-218 and alpha AGAIN to form Pb-214, then beta to form Bi-214. It all depends on the stability of the atom and the...

Yeah, same thing here. I got 139 and 156. Any IQ test that relies on time is flawed. Apparently an IQ test is meant to be independent of time, shit thing is they cost like $300 from a psychologist. I got mine tested back when I was very young (8 years old I think), would be interesting to see...

1) 149 2) sorry, cbf Tried to do it a second time real quick and i got 146, lol.. Maybe i missed a question or something

1a) Find the final velocity of a vehicle moving initially at 15ms-1 and subject to a deceleration of -0.5ms-2 for 40s v = u + at v = 15 + (-0.5*40) v = 15 - 20 v = -5 ms^-1 1b)Find the average velocity of the vehicle over this duration, and the time at which value this corresponds to it's...

Yes, the constant is a relative index of refraction. This tells you how many times more (or less) optically dense medium 2 is compared to medium 1. Example water --> glass would equal 1.5/1.33 which is somewhere around 1.12 The constant is only ever the absolute index of refraction of medium 2...

The spectral lines of hydrogen are produced when hydrogen gas is excited using a high-voltage source. This means that the electrons in the atom are actually excited, and thus emit radiation. Importantly, the visible spectrum of the hydrogen atom, called the Balmer series of spectral lines...

In the HSC, not necessarily. The HSC Physics course is very light on mathematics. Engineering Science is much more focussed on maths (like the old physics course) If you decide to undertake a science / engineering degree at university level, then yes you need to be good at maths (and understand...

Interesting question :) One of my students asked me the very same question last year. I was stumped. The Revolving Astronaut that site helped a bit :)

Short answer to both: Yes When using s = ut + 1/2at^2 If s is not zero, then you can use quadratic formula to find t

HSC Tutoring Year 12 Physics (Starting Term 4, 2009) Year 11 Physics (Starting 2010) About me / Experience: My name is Chris, I am in my 3rd year of teaching Physics in a Western Sydney High School in the Blacktown area. I completed my B.Sc (Nanotechnology) in 2005 at UTS with a WAM of 83...

My good ole optarse mobile broadband drops out about every 20 mins. I cant upload anything without it dropping out :( Im pretty sure i cant access file sharing sites at work either. Perhaps i will upload them over time :) I just would rather get stuff im looking for in return :)

I have over 150 past papers from various sources. I would like to swap papers with some people off here if you have any of the following :) ARC 2007 and 2008 NEAP 2003 - 2006 and 2008 STA 2005-2008 thx :) feel free to PM me or attach in this thread

What i would think: 1. Saying "gravity is..." is wrong, it is acceleration due to gravity 2. Is the student referring to gravity being 9.8ms^-2 everywhere in the universe? Obviously wrong (mention Newtons Law of universal gravitation) and how this value reflects the average value for g at...

Poor question... There is always something wrong in the CSSA trials..

You need to make sure you answer the question, nothing more! The more your write, the higher the chances of you saying something wrong and losing marks. In physics, there are always key terms or ideas which are being looked for. If you write 2 paragraphs, run out of space, figure its good...

Just add it to the list! Damn Shadwick and his errors!

Sorry Lala! Ahhhh, don't say that! All teachers make some mistakes! I am no better than a lot of others (definately better than some, but definately not as good as others!) This is my first time teaching the course, have made many mistakes... feel bad for my year 12s sometimes cuz i...

time dilation dude :)

It's better not too. The marking criteria in the HSC is very explicit. If you use integration you may not tick all of the boxes, even though it is more correct

Ty for your feedback m8! Definately will change that Q18, cheers! Was some reasoning behind not including the more mathematically rigorous questions (i.e., their hye was calculation intense as was their projectile motion assessment task) Now that you mention it, i have nfi what i did with my...