Okay I have received my hsc results and I just want to say that official's estimate of 99.60+ was right. Although there were a few disappointments in my results for some subjects I am relatively pleased. Thanks to all the people who gave me an estimate.
By the way I was able to a band 6 in...
I got something like 0.17mg/L for the concentration from the graph. My final result after calculations was something like 0.23mg/kg which is smaller than 0.5mg/kg so it is safe to eat.
Change in gpe is always positive.
Induced emf is in opposite direction. Lenz's law.
I think the back emf has to be smaller because there needs to be a constant supply emf for the motor to turn in a constant rotation.
For gpe the radius is not squared...
This is what I got
1. D
2. A
3. C
4. C
5. C
6. C
7. B
8. A
9. B
10. D
11. D- this one was hard
12. A
13. B
14. D
15. D- i think the wording was a little off
16. A
17. B
18. A
19. D
20. B