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    May 2012
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  1. Are you sure you divide by two? Recall that the field is uniform. It doesn't matter where the charge will be, there always be the same force on it. Think of it this way, it gets closer the to the attracting charge, but farther away from the reuplsice charge, so the force is constant! I'm pretty sure then that it's 300, and not 150. but I could be wrong.
  2. Astrophysics was a delight. I thought communications was quite a challenge. I had no idea how to solve the mutiplexing question, I just went according to units and wished my lucky stars. I got 13 radio stations as well. Well 13.5, but you can't have half a station so it must be 13.
  3. Yea it was easier, and despite that I made many stupid mistakes :/
  4. I made many stupid mistakes. I did B1 B3 and B4 just cuz. I don't know why, it was stupid. For the electricity question if they will collide, I calculated the change in potential and hence the kinetic enery reuired using eV=0.5mV^2. I then calculated its kinetic energy by knowing its mass and velocity. The required kinetic velocity was greater so they did not collide. For the phase question I did 3 or 4, i don't remember which one, but I'm sure one of them is correct. Hopefully the grade boundaries will be low. P3: Astro was really easy, I got almost all the marks. Communications was very dif
  5. I thought Paper 1 was easy. Paper 2 was a challenge.. no equillibirum question in section B! And hydrogen peroxide in part A! Paper 3 went well. Yea, the penicilin part was strange. 3 marks? what? I wrote that they were able to isolate it and mass produce it.
  6. I think you misunderstand the concept of entropy. Molecules of a gas in a close system can NOT lose energy. Collisions between molecules are completely elastic, that is, kinetic energy is conserved. Energy is lost to heat in macroscopic colissions (between two bowling bowls for example). I'll explain why there is no energy loss in a collision between two molecules. Molecule A has kinetic energy and molecule B has kinetic energy. They both collide. According to you, some energy has been lost to thermal energy. But temperature is just a measure of the average kinetic energy of molecules. They c
  7. I didn't get -31, I got a postive value for acceleration. Probably did that one wrong too That is correct
  8. I thought this paper was challenging. I believe for the matrix question you had to do A-1CA to solve. I got the second part of probability wrong, does anyone know how many marks was that? It was an easy question but I got confused with the wording. The vector section was simple. For the second part of section B, you had to derive the cubic expresiion and equate it to zero, and then plug in x=1, (because min point is at x=1) The last part of section B was challenging. I did not know how to do the last question. Anyone solved that one? You had to write down the doman in theta or something..
  9. I take Chem SL and Physics HL. I'd say Chem SL is much easier than Physics SL. Almost all the topics in chem SL overlap, so even when you learn something new, it's not completely new. I'd say physics is more interesting though, but you need to know a lot more. For example, in chemistry, you only need to define very few terms, i'd say something like ten. In physics, there's much more. Another comparison: We finished the chem syllabus around 2 months (maybe even more) before the last say of school. For Physics, we finished it 1-2 weeks before!
  10. So what do you think will be the grade boundaries of this paper?
  11. I chose the poem "dinner party 1940" It was very easy to understand. I talked about how the people have the news on but ignore what's really going on. About the contrast between the radio's voice and the peoples' voice.. What did you guys write about?
  12. Yea, they're probably my favorite IA's. It's cool to figure out new things, and use you knowledge in math to figure out new things about math. It's probably the only IA where I feel I'm doing something significant.
  13. Yep, that's the curve. But why should they all attain the same kinetic energy? All the collisions are elastic between the molecules. Why would they average out and all have the same kinetic energy? I guess I just have a hard time applying the second law to this system.. because yes, that is what SHOULD happen, Can you explain this in terms of collisions and not just in terms of the second law? Thanks
  14. 1 and 3 are pretty straight forward.. but number 2 is a tricky one, gah the IB always catch you somewhere. @Drake Glau, are you sure about that? Yes, according to the second law that should happen.. but it just sounds so strange.. would this be a very very long process? Also, at any given temperature, there's an associated curve for the average kinetic energies. Do you have any links you can refer to to back that up? (I'm a bit skeptical, sorry )
  15. Thanks Mitch! By the way, are you going to release any videos on the communications option?
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