1. ## Re: Physics Exam Thoughts

Originally Posted by Drdusk
Yeah beta is technically zig-zaggy, but it complied more with beta than Gamma. Gamma doesn't produce continuous tracks. Rather they are very short dots which are at a distance away from the source.
Also gamma has barely any impact on the nuclei, and surely the 4 marks would have wanted some info on alpha affecting nuclei and beta affecting nuclei

2. ## Re: Physics Exam Thoughts

Originally Posted by supR
Also gamma has barely any impact on the nuclei, and surely the 4 marks would have wanted some info on alpha affecting nuclei and beta affecting nuclei
Yea probably. I just put that energy is released as gamma and the nuclei isn't affected.

3. ## Re: Physics Exam Thoughts

Lol nice new signature supR

4. ## Re: Physics Exam Thoughts

The question said to ignore orbital velocity and rotational of the moon. And over the 500km altitude the acceleration change would be to large to be a projecitle motion question. So the kinetic energy which was equal to the work done could be derived from part i). 1.26x10^7= 1/2mv^2
hence v=1122m/s thoughts?
You have to consider the original velocity as well.
So you work out initial GPE and initial KE, giving you total energy of the system. (1)
Then you work out final GPE at 500km altitude. (2)
Conservation of energy means that (2)+final KE is equal to (1)
Therefore you get value of final KE (at 500km altitude)
Equate to 1/2mv^2 and solve for v
You end up with 426.83 ish for v

5. ## Re: Physics Exam Thoughts

The ruler wasn't held against the wall so the camera would have picked up errors in reading.

6. ## Re: Physics Exam Thoughts

Haha holy crap I just realized I wrote Quanta to quarks on the extra writing booklet and not Physics.
smh

7. ## Re: Physics Exam Thoughts

I said for the projectile that the camera wasn't centred and would therefore distort the image. Reckon that is a valid response?

8. ## Re: Physics Exam Thoughts

Originally Posted by Joshfotho
I said for the projectile that the camera wasn't centred and would therefore, distort the image. Reckon that is a valid response?
I was about to write down something about the camera but then I read the question closely and it said the camera captured the whole trajectory, so I scrapped that. So i'm not sure

9. ## Re: Physics Exam Thoughts

nah u have to do change in KE, so change in GpE + change in KE = 0, to get about 400 i believe

10. ## Re: Physics Exam Thoughts

For induction cooktops in multiple choice. Was the frequency 50kHz or 50Hz because isn't power supply for AC limited to 50Hz?

11. ## Re: Physics Exam Thoughts

Originally Posted by impulsebro89
I was about to write down something about the camera but then I read the question closely and it said the camera captured the whole trajectory, so I scrapped that. So i'm not sure
it captures the whole trajectory but parallax error takes into affect because it has an angled view so its a valid response
(checked with my physics teacher)

12. ## Re: Physics Exam Thoughts

What did everyone get for the acoustic impudence of fat?

13. ## Re: Physics Exam Thoughts

Think there's two possible answers. One is greater than the kidney impedance and one is less than. Both should be correct.

14. ## Re: Physics Exam Thoughts

did you write both? i had a quadratic and scrapped it cause i didnt think there would be two

15. ## Re: Physics Exam Thoughts

I changed my answer from high frequency 50kHz to 50hz, how could changes in flux be occurring faster than the current that induces them so went with low.

16. ## Re: Physics Exam Thoughts

Wasn't a fan of most of the paper but loved Age of Silicon option. Especially the 7 mark question with the fire alarm system.

17. ## Re: Physics Exam Thoughts

Nah lol don't write both. I only know from hearing peoples answers.
You also didn't need to keep it in a quadratic, could've just took the roots of both sides.

18. ## Re: Physics Exam Thoughts

Yeah I agree it should have been 50Hz. Lots of people put 50kHz that I've asked but.

20. ## Re: Physics Exam Thoughts

Whilst most apparently did it by equating E, I did it by calculating the g on moon (from given data), and then subbed it and delta y=500km into the projectile motion questions. I got the same answer, but will I lose a mark based on my incorrect assumption that g would be constant up to that height?

21. ## Re: Physics Exam Thoughts

Wouldn't be full marks lol

22. ## Re: Physics Exam Thoughts

Originally Posted by asiansensation46
Yeah I agree it should have been 50Hz. Lots of people put 50kHz that I've asked but.

Sent from my iPhone using Tapatalk

23. ## Re: Physics Exam Thoughts

ummm guys matrix already put up the solutions for the physics test, you can check your answers for the mutlis

24. ## Re: Physics Exam Thoughts

Can anyone explain how a 78 and an 83 raw both got aligned to 90 in 2017 physics (according to raw marks website)

25. ## Re: Physics Exam Thoughts

some people just fake it as well, cause anybody can edit it

Page 3 of 4 First 1234 Last

There are currently 1 users browsing this thread. (0 members and 1 guests)

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•