# Christina perera

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## Profile Information

• Gender
Female
• Exams
May 2013
• Country
United States
1. ## MAY13 Chemistry SL TZ2 Paper 1 & 2

What was the answer to the hess law question? was it something like -107?
2. ## MAY13 Maths HL P1 TZ2 Discussion

That is the question which i was mega ambigious about. I hope you can answer my amibguity, because then i might get 120/120 marks, and I would feel ****ing good. Q.10: Acceleration was given to be (60-v)/40, and initially the particle was at rest so at t=0, v=0. We were supposed to find the value of v at t=30. dv/dt=(60-v)/40 (60-v)dv/dt=1/40 Integrating both sides would give -ln|60-v|=t/40+c so at t=0, v=0 gives c=-ln60. We have ln|60-v|=ln60-t/40 so at t=30 ln|60-v|=ln60-3/4 |60-v|=e^(ln60-3/4) This gives v=31.7 or v=88.3 because of the absolute value sign. Now this really confused me durin
3. ## MAY13 Maths HL TZ2 Paper 2 Discussion

y equals +- sqrt of the thing. What did you do for the 1 experiement...took n=1 or 16?
4. ## MAY13 Maths HL TZ2 Paper 2 Discussion

Ahhh looking at my calculator, I got -3.88 * 10^-5 rad s-1, which is small indeed O_O Who knows, hopefully we're right Even I got the value as 2.26 * 10^-4. Pretty sure I am right. Had to substitute 10 in the equation and multiply by 0.5
5. ## MAY13 Maths HL TZ2 Paper 2 Discussion

I am pretty sure you dint have to complicate it so much. It was straightforward. Total income from 3 requests = 180. This should be multiplied by the probability which was around 0.2 giving the answer in 30s.
6. ## MAY13 Maths HL TZ2 Paper 2 Discussion

For the binomial one, n should be 1 because the question said 1 experiment and 1 experiment wasn't defined as 16 trials. For the volume one, it shouldn't be what you said as it was rotated around y=1 not y=0 (the x axis)
7. ## MAY13 Maths HL TZ2 Paper 2 Discussion

I can't remember the question but I think it was binomial and I just did P(X=1) + P(X=16). I wasn't really sure what it was asking for too, and generally I'm not too confident on the probability questions in this paper I thought it was quite weird. I think 1 experiment should be n=1. So p(x=3) is not possible. What did others put? I thought the same thing as you, for n=1, x=3 gave 0, and x=1 was 0.25, so i just put 0.25, but I had honestly no clue Oh damn, for that I thought the 16 trials constituted "1 experiment" so I got something like 0.261. You're probably correct. It didn't say "experi
8. ## MAY13 Maths HL TZ2 Paper 2 Discussion

I can't remember the question but I think it was binomial and I just did P(X=1) + P(X=16). I wasn't really sure what it was asking for too, and generally I'm not too confident on the probability questions in this paper I thought it was quite weird. I think 1 experiment should be n=1. So p(x=3) is not possible. What did others put?
9. ## MAY13 Maths HL TZ2 Paper 2 Discussion

In paper 2 section B what was the probability answer? what was the meaning of "1 experiment" was n=1 or 16. Also can someone tell me the 12f, the question on volume on revolution in section B
10. ## MAY13 Maths HL P1 TZ2 Discussion

In paper 2 section B what was the probability answer? what was the meaning of "1 experiment" was n=1 or 16. Also can someone tell me the 12f, the question on volume on revolution in section B
11. ## IA (HL) Math portfolio length

Type I or Type II? Longest Type I at my school was 52, last year; longest type 2 however was longer - 60-something, I believe. The worst-case scenario is you lose one mark on quality of work if you're not precise. However, you can be long and still precise, depending on the methods/layout used. Its type 1...Its the patterns from complex numbers one and I guess to achieve higher marks I am testing for limitations and the conjecture at each of the three places. I shall ask my teacher about this and ask her suggestion to reduce the number of pages. Thanks for your help
12. ## IA (HL) Math portfolio length

Okay so I am doing my portfolio and it already is 55 pages and I am afraid it could come close to 100 pages(graphs are about half a page). I know this is unusually long, would my marks be deducted for this ? I know there is no criteria for word count or any restrictions on it, but I am scared.