• Best of luck to the class of 2019 for their HSC exams. You got this!

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

M@ster P

Member
Joined
Feb 9, 2008
Messages
619
Gender
Male
HSC
2009
umm 24b?

I got m between 1 and 3, because directly proportional means it is a straight line, and a straight line occurs between 1 and 3

Edit: when i think about it know directly proportional could mean anything, y = x^3, x^4 not just y =x, so not sure now
 
Last edited:

Macdwg

Professional Mad Lad
Joined
Jun 15, 2008
Messages
93
Gender
Male
HSC
2009
I'm going to say that the magnet question is open to interpretation, it really depends on the distance between the magnet and the wire, which we aren't given, and hence from this you are unable to assume that the field lines are acting horizontally like moke is suggesting, nor are you able to assume that its far enough for the field lines to pull back in the direction of the south pole. My guess is that you probably should assume they are acting horizontally to the right, however it's arguable.

Hence why this question sucks penis, the end.
 

Ruptured

New Member
Joined
Feb 10, 2008
Messages
7
Gender
Male
HSC
2009
umm 24b?

I got m between 1 and 3, because directly proportional means it is a straight line, and a straight line occurs between 1 and 3

Edit: when i think about it know directly proportional could mean anything, y = x^3, x^4 not just y =x, so not sure now
Directly propertional is where the ratio between the two values is constant. So just a straight line of any gradient
 

darkchild69

Nanotechnologist
Joined
Sep 6, 2006
Messages
236
Location
Sydney
Gender
Male
HSC
2001
umm 24b?

I got m between 1 and 3, because directly proportional means it is a straight line, and a straight line occurs between 1 and 3

Edit: when i think about it know directly proportional could mean anything, y = x^3, x^4 not just y =x, so not sure now
Directly proportional means y = kx where k is a constant of proportionality, hence plotting y vs x will be a straight line.

not y = kx^2 (this means y is directly proportional to x^2, not x. If you plot y vs x in this form, it will not be a straight line, hence not directly proportional)

mass should be between around 1.3-3

It is definately not 1-3, it begins after 1
 

M@ster P

Member
Joined
Feb 9, 2008
Messages
619
Gender
Male
HSC
2009
Directly proportional means y = kx where k is a constant of proportionality, hence plotting y vs x will be a straight line.

not y = kx^2 (this means y is directly proportional to x^2, not x. If you plot y vs x in this form, it will not be a straight line, hence not directly proportional)

mass should be between around 1.3-3

It is definately not 1-3, it begins after 1
sigh, wasn't accurate enough
 

youngminii

Banned
Joined
Feb 13, 2008
Messages
2,093
Gender
Male
HSC
2009
Directly proportional means y = kx where k is a constant of proportionality, hence plotting y vs x will be a straight line.

not y = kx^2 (this means y is directly proportional to x^2, not x. If you plot y vs x in this form, it will not be a straight line, hence not directly proportional)

mass should be between around 1.3-3

It is definately not 1-3, it begins after 1
1.3 - 3?
It was straight from 0 - 1.3, then became all wavy from 1.3 - 3.. Unless I remember wrong? Damn
 

darkchild69

Nanotechnologist
Joined
Sep 6, 2006
Messages
236
Location
Sydney
Gender
Male
HSC
2001
1.3 - 3?
It was straight from 0 - 1.3, then became all wavy from 1.3 - 3.. Unless I remember wrong? Damn
Shit yeah, i think you are right actually!

Damn paper is upstairs now, cbf checking, but im pretty sure you are right
 

Ruptured

New Member
Joined
Feb 10, 2008
Messages
7
Gender
Male
HSC
2009
Shit yeah, i think you are right actually!

Damn paper is upstairs now, cbf checking, but im pretty sure you are right
Glad to hear that because I was thinking a minute ago that I could've sworn it was 0-1.3
 

darkchild69

Nanotechnologist
Joined
Sep 6, 2006
Messages
236
Location
Sydney
Gender
Male
HSC
2001
LoL

I REALLY need to read the questions before I answer

I'm meant to know this stuff!

I just checked the paper and yep, definately 0-1.3 :D
 

fallingstar

Member
Joined
Dec 9, 2008
Messages
112
Gender
Female
HSC
2009
Also, anyone who got A=34.5 is wrong and made this mistake.
I x I does not = 2I, it equals I squared. Therefore your answers were 69/2 = 34.5A when they should have been root 69 = 8.3A
dammit i did this! I'm an idiot, why can't I do basic math?!?!?
argh
 

tommowhit

New Member
Joined
Jul 30, 2009
Messages
20
Gender
Male
HSC
2011
thas a conventinal current

n normal electric current (electron flow) they travel from negative to positive
u use the right hand in the right hand palm rule for convenionl current if ur going 2 use electron flow u still use direction of positive charge or use left hand
 

whitnall8

Member
Joined
Feb 19, 2009
Messages
151
Gender
Male
HSC
2010
We always deal in conventional current though, not in the flow of electrons.
 

tashisthebest

Member
Joined
Dec 1, 2008
Messages
64
Gender
Male
HSC
2009
umm no you still uses your right hand rule for a electric current

all the past papers n question i have done i have used the right hand rule n i have been right.

i have been taught this by ma teacher n my tutor.

so im sure about this
 

random-1005

Banned
Joined
Dec 15, 2008
Messages
610
Gender
Male
HSC
2009
i did both to be sure!


I was almost ready to write on the paper: Thanks for giving us engineering students an unfair advantage!
But they look noting like conventional stress/strain curves!
they practically held your hand with that rubber band question.

lol, the questions people are asking, you are all shit, why did u even do physics, just roll over and die noobs
 
Last edited:

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top