# My answers (not including long response) (1 Viewer)

#### youngminii

##### Banned
1. C
2. A
3. C
4. D
5. C
6. A
7. C
8. C
9. A
10. C B is the correct answer
11. B
12. C D is the correct answer
13. B
14. C
15. A
..Multiple choice was hard

16. a) 4900
b) 1.3 * 10^21 Edit: I think I changed this into something like 2 * 10^5 or something, not too sure.. Double Edit: The original answer was right, fml
17. Wrote about a plum bob hanging (to determine interial/non-inertial FOR)
18. a) 760 light years
b) 2.4 * 10^10 seconds (I used 365.25 days in one year) Edit: This is the same as 760 years
19. a) 1.602 * 10^-16 N downwards
b) 5.9 * 10^-8 seconds (that was the projectile one)
20. I used induction cooktop, loudspeakers and a power drill Edit: This is the transformation question
21. a) X
b) 0.1176Nm downwards
c) 0.049 Wb (I know, it's meant to be Tesla, FML)
23. a) Left
b) 8.3A
c) Left (towards W1)
24. a) Band E
b) Band F, 0 -> 1.3kg
25. a) Opposite charges Edit: Since it was 2 marks, I added a qualitative analysis using F = qvBsin(theta)
b) 2.5 * 10^-2 Wb (yes yes Tesla fuck you)

And yeah Quanta was pretty straightforward
I want to know which ones I got wrong, thanks

P.S. I had enough time to write all my answers on the data sheet
Yeah, that was an easy exam.. Still managed to lose heaps of marks

Edit: I remember I changed one of my answers, I think it may have been 16 b)

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#### exiting

##### Member
isn't 16b) a bit too heavy for an asteroid?

#### youngminii

##### Banned
Can't remember the question
But yeah you sound right

#### moo92

##### New Member
what was question 20 on?? :S I don't remember any of it......

#### youngminii

##### Banned
20 was the table with three different energy transformations

#### Macdwg

You definately got the asteroid mass correct. I got like 1.something x 10 ^ 21 i KNOW that its right.

I forget alot of my answers, But which side did u put the rock on for the coil?

Sorry didnt see your answer, how did u get X by the way?

#### youngminii

##### Banned
The magnetic field was in such a way that the X side would experience a force directed up
Hence, if you put a rock on it, it would cancel out that force and balance each other out
You then equate these forces for the next questions IIRC

Btw yay for asteroid

#### Macdwg

Was the current going to the right to y then around to x or vice versa?
Also did u point your fingers left as there was only a magnet of N, then those field lines go to south (which is left).

#### youngminii

##### Banned
Yeah the magnet being by itself confused me.. I didn't really know where the South pole was
I assumed the South pole was on the other side of the coil, which is a safe assumption imo

#### AnandDNA

##### Member
b) 0.1176Nm downwards

how did you get this?

i use t=fd
t=0.04x9.8x0.10

mc- 10 B<<<< still not sure though
11-A judging by other ppl's discussion here
12-D

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#### youngminii

##### Banned
T = Fd
F = ma, so T = ma * d
m was 0.04, a was 9.8 and d was 0.3, not 0.1

#### Macdwg

I assumed there was no other magnet and the lines flowed from north to south on that one magnet, therefore only placing side X in a magnetic field. Worked out that x was going down and y went up as it was pivoting. blah blah blah.

wish i could see the paper damnit.

#### AnandDNA

##### Member
T = Fd
F = ma, so T = ma * d
m was 0.04, a was 9.8 and d was 0.3, not 0.1
oh yeh shit i went from the current to the centre

#### youngminii

##### Banned
I assumed there was no other magnet and the lines flowed from north to south on that one magnet, therefore only placing side X in a magnetic field. Worked out that x was going down and y went up as it was pivoting. blah blah blah.

wish i could see the paper damnit.
Lol but if it was the only magnet, the coil would not have been inside the magnetic field.. Is my thinking, I may be wrong
AnandDNA said:
oh yeh shit i went from the current to the centre
Lol bl >< silly mistake

#### Thecorey0

##### Member
How did you do 16b? I got something to the power of 16. Everything else of mine basically matches.

Btw what do you think you got raw?

#### HailSatan

##### Member
Fuck SI units... I can recall not converting to them at least twice now...

#### random-1005

##### Banned
1. C
2. A
3. C
4. D
5. C
6. A
7. C
8. C
9. A
10. C
11. B
12. C
13. B
14. C
15. A
..Multiple choice was hard

16. a) 4900
b) 1.3 * 10^21
17. Wrote about a plum bob hanging (to determine interial/non-inertial FOR)
18. a) 760 light years
b) 2.4 * 10^10 seconds (I used 365.25 days in one year)
19. a) 1.602 * 10^-16 N downwarsd
b) 5.9 * 10^-8 seconds (that was the projectile one)
20. I used induction cooktop, loudspeakers and a power drill
21. a) X
b) 0.1176Nm downwards
c) 0.049 Wb (I know, it's meant to be Tesla, FML)
23. a) Left
b) 8.3A
c) Left (towards W1)
24. a) Band E
b) Band F, 0 -> 1.3kg
25. a) Opposite charges
b) 2.5 * 10^-2 Wb (yes yes Tesla fuck you)

And yeah Quanta was pretty straightforward
I want to know which ones I got wrong, thanks

P.S. I had enough time to write all my answers on the data sheet
Yeah, that was an easy exam.. Still managed to lose heaps of marks
i got the same answers as you, cept 18, lol i mad fuked up length contraction, did know what to solve for lo or lv

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#### random-1005

##### Banned
isn't 16b) a bit too heavy for an asteroid?
no, unfortunately you cannot estimate answers in physics, it doesnt have to be realistic, its what they asked, which is all that matters.

i remember getting something like 1.3*10^21kg from kepler

ahh FUCK