• Congratulations to the Class of 2024 on your results!
    Let us know how you went here
    Got a question about your uni preferences? Ask us here

HSC Physics Marathon 2013-2015 Archive (6 Viewers)

Status
Not open for further replies.

Mr_Kap

Well-Known Member
Joined
Mar 24, 2015
Messages
1,127
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

Sample asnwer says:

The principle of re
lativity states that it is not possible to detect motion with uniform velocity
while in one frame of reference without referring to another frame of reference. Thus, the
principle only applies for non
-
accelerating steady motion, which occurs in an inertial
frame of
reference. Within an inertial frame of reference, experiments or observations cannot be
performed which would indicate whether an object is stationary or moving with constant
velocity. The speed of light, c, is constant in inertial frames of refe
rence, which leads to time
dilation, etc.
 

malcolm21

Active Member
Joined
Nov 7, 2014
Messages
437
Gender
Male
HSC
N/A
re: HSC Physics Marathon Archive

How mcuh do we need to know about energy transformations in the home and industry? It's the last dotpoint in motors and I havent been able to find much info on it at all
 

Khan.Paki

Member
Joined
Jul 23, 2007
Messages
97
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

try hsc.csu. They have a good and brief coverage on that dot point
 

TQuadded

Breaking the limits.
Joined
Sep 11, 2014
Messages
342
Location
In a parallel universe.
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

How mcuh do we need to know about energy transformations in the home and industry? It's the last dotpoint in motors and I havent been able to find much info on it at all
The most a question would ask about this would probably be 3 marks, if it even appears at all.

It would most likely give a scenario, then maybe ask to identify some energy transformations in it.
 

Mr_Kap

Well-Known Member
Joined
Mar 24, 2015
Messages
1,127
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

How do you find centripital acceleration given the speed of an object travelling in a circle, and the radius of the object from the centre
 

Seanos_Nachos

New Member
Joined
Feb 17, 2015
Messages
5
Gender
Male
HSC
2016
re: HSC Physics Marathon Archive

Centripetal acceleration = v^2/r

Can be derived from Gmm/d^2 = mv^2/r
 

InteGrand

Well-Known Member
Joined
Dec 11, 2014
Messages
6,109
Gender
Male
HSC
N/A
re: HSC Physics Marathon Archive

Centripetal acceleration = v^2/r

Can be derived from Gmm/d^2 = mv^2/r
Not really, since the centripetal force mv^2/r assumes the centripetal acceleration formula and then uses F = ma essentially, so this reasoning is circular (lol).
 

Seanos_Nachos

New Member
Joined
Feb 17, 2015
Messages
5
Gender
Male
HSC
2016
re: HSC Physics Marathon Archive

Not really, since the centripetal force mv^2/r assumes the centripetal acceleration formula and then uses F = ma essentially, so this reasoning is circular (lol).
Yes but the centripetal acceleration formula is the only one not on the HSC data sheet so I was referring to using the formulas given to you, to derive the formulae you need.
 

Seanos_Nachos

New Member
Joined
Feb 17, 2015
Messages
5
Gender
Male
HSC
2016
re: HSC Physics Marathon Archive

Through lenz's law and the right hand rule the conductor cutting flux induces a current to oppose the change which caused it (P to R)
Since the direction of current is the opposite to the direction of electron flow, there would be a concentration of electrons at P so the answer is (A)
 

Thjv

Member
Joined
Sep 10, 2014
Messages
42
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

Yes but the centripetal acceleration formula is the only one not on the HSC data sheet so I was referring to using the formulas given to you, to derive the formulae you need.
Yes, equate ma with mv^2/r
 

astroman

Well-Known Member
Joined
May 12, 2014
Messages
7,069
Location
Las Vegas
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

are faradays laws questions common, i never remember using the formula.
 

astroman

Well-Known Member
Joined
May 12, 2014
Messages
7,069
Location
Las Vegas
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

Describe how magnetic fields can be produced by either by current carrying coils or permanent magnets. 2marks.
 

EyyB0ss

New Member
Joined
Oct 2, 2015
Messages
1
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

Hey guys, new user here
Was wondering if anyone does Quanta. Could someone explain to me De Broglies hypothesis with reference to this question.
Thanks in advance
z81pSdh.png
 

Mr_Kap

Well-Known Member
Joined
Mar 24, 2015
Messages
1,127
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

Describe how magnetic fields can be produced by either by current carrying coils or permanent magnets. 2marks.
I actually don't know this. lol.

How do i DESCRIBE it.
like i know its a fact but what's the answer?
 

Drsoccerball

Well-Known Member
Joined
May 28, 2014
Messages
3,650
Gender
Undisclosed
HSC
2015
re: HSC Physics Marathon Archive

I actually don't know this. lol.

How do i DESCRIBE it.
like i know its a fact but what's the answer?
When there is a current there is a magnetic field. Therefore by utilising current carrying coils we can also manipulate their produced magnetic field. This can either be use or a permanent magnet which also provides a magnetic field.
 

Mr_Kap

Well-Known Member
Joined
Mar 24, 2015
Messages
1,127
Gender
Male
HSC
2015
re: HSC Physics Marathon Archive

Am i right saying that when you travel at relativistic speeds your mass doesn't change to YOUR PERSPECTIVE????

Because to someone watchning it gets heavier.. but what about if YOU are travelling that fast?
 
Status
Not open for further replies.

Users Who Are Viewing This Thread (Users: 0, Guests: 6)

Top