HSC Physics Marathon 2013-2015 Archive (1 Viewer)

[duhdevitt]

re: HSC Physics Marathon Archive

What order is everyone doing the exam tomorrow?

Quanta,Short answers, MC (

 

[Kaido]

re: HSC Physics Marathon Archive

Quanta,Short answers, MC (

Explain why you are tackling it this way.

 

[Mr_Kap]

re: HSC Physics Marathon Archive

What order is everyone doing the exam tomorrow?

Might do the quick multiple choice questions first...leaving out all the harder ones till later.
Then do all the quick short answer questions.
Then do the longer short answer questions and the 6/7/8 marker.
Do the Option (apart from 6/7/8 marker)
Finish Multiple Choice
Do 6/7/8 marker from Option

 

[duhdevitt]

re: HSC Physics Marathon Archive

Explain why you are tackling it this way.

In all my exams I've done, quanta had been the easiest so I finish it first which increases my motivation, then short answers

 

[atargainz]

re: HSC Physics Marathon Archive

Might do the quick multiple choice questions first...leaving out all the harder ones till later.
Then do all the quick short answer questions.
Then do the longer short answer questions and the 6/7/8 marker.
Do the Option (apart from 6/7/8 marker)
Finish Multiple Choice
Do 6/7/8 marker from Option

I'll probably be doing a similar approach:
1) MC first
2) Option (leaving out the high marker)
3) Short answers (leaving out the high markers)
4) Go back and spend as much time as possible on the 6/7/8 markers making sure to cover everything

 

[Mr_Kap]

re: HSC Physics Marathon Archive

GUYS! URGENT HELP NEEDED.

I've forgottn how to do relativity questions like time dilation/mass increase/length contration.

I don't know what to make lo , vo and mo and what to make l, v ,m ??

HELP!!

 

[malcolm21]

re: HSC Physics Marathon Archive

GUYS! URGENT HELP NEEDED.

I've forgottn how to do relativity questions like time dilation/mass increase/length contration.

I don't know what to make lo , vo and mo and what to make l, v ,m ??

HELP!!

lv is the length viewed by the observer that is not at the rest frame of reference while lo is, same thing with m and v

 

[Mr_Kap]

re: HSC Physics Marathon Archive

so what about this question. Is 1.7 x 10^5 the lv or lo value??

 

[Kaido]

re: HSC Physics Marathon Archive

so what about this question. Is 1.7 x 10^5 the lv or lo value??

calc l(v) = 1.7x10^5 etc
etc being the root shit
l(v)= 760.26ly

 

[malcolm21]

re: HSC Physics Marathon Archive

so what about this question. Is 1.7 x 10^5 the lv or lo value??

It's Lo, do you have the answers to check?

 

[Mr_Kap]

re: HSC Physics Marathon Archive

calc l(v) = 1.7x10^5 etc

i though that lv was the moving frame and the earth is moving relative to you??

 

[Mr_Kap]

re: HSC Physics Marathon Archive

answers say:

lv = 1.7x10^5 *root (rubbish)

like kaido said

 

[Kaido]

re: HSC Physics Marathon Archive

i though that lv was the moving frame and the earth is moving relative to you??

yeah soz, worded it badly

 

[Mr_Kap]

re: HSC Physics Marathon Archive

Difference between relativity and Special relativity???

 

[InteGrand]

re: HSC Physics Marathon Archive

Difference between relativity and Special relativity???

Special Relativity is a special case of relativity where you always assume constant velocity (so only considering inertial frames of reference).

In General Relativity, you consider the general case of non-constant velocities, so the frames of reference are non-inertial. General Relativity is much harder than Special Relativity.

 

[Kaido]

re: HSC Physics Marathon Archive

Difference between relativity and Special relativity???

Assuming you mean galilean relativity, its only applicable at lower, non-relativistic speeds (e.g. addition of velocities which you learn in moving about)

 

[Thjv]

re: HSC Physics Marathon Archive

Difference between relativity and Special relativity???

The theory of relativity states that the laws of physics are the same for all inertial frames of reference; it is impossible to conduct a physical experiment within an inertial frame without reference to an external point. The principle of special relativity revolves around the concept of relativity, however also states that the speed of light is constant for all frames of reference (3x10^8m/s) regardless of the observer's motion.

 

[Kaido]

re: HSC Physics Marathon Archive

Special Relativity is a special case of relativity where you always assume constant velocity (so only considering inertial frames of reference).

In General Relativity, you consider the general case of non-constant velocities, so the frames of reference are non-inertial. General Relativity is much harder than Special Relativity.

You also consider the effects of gravity (as a 4D space-time continuum) in General Relativity
Havent read too much lel

 

[Mr_Kap]

re: HSC Physics Marathon Archive

So what does this question actually mean?

 

[TQuadded]

re: HSC Physics Marathon Archive

So what does this question actually mean?

The theory of relativity states that the laws of physics are the same for all inertial frames of reference; it is impossible to conduct a physical experiment within an inertial frame without reference to an external point. The principle of special relativity revolves around the concept of relativity, however also states that the speed of light is constant for all frames of reference (3x10^8m/s) regardless of the observer's motion.

Remove the parts for special relativity from his answer and elaborate more on the frames.