# HSC Physics Marathon 2013-2015 Archive (1 Viewer)

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#### Drsoccerball

##### Well-Known Member
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?
You don;t feel the change.

#### Mr_Kap

##### Well-Known Member
re: HSC Physics Marathon Archive

what about if you are travelling at relativistic speeds on a spaceship and you go past the earth. Will the earth increase its mass by a shit tonne??

#### duhdevitt

##### Active Member
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.
View attachment 32605
a photon is absorbed when the electron moves UP a stationary state.but at the ground state there are no electron wavelengths because n=0

#### Seanos_Nachos

##### New Member
re: HSC Physics Marathon Archive

what about if you are travelling at relativistic speeds on a spaceship and you go past the earth. Will the earth increase its mass by a shit tonne??
I believe from your perspective the earth's mass would've increased a shit tonne but from the perspective of the people on earth, their mass is normal and your spaceship weighs a shit tonne

#### Apdo

##### New Member
re: HSC Physics Marathon Archive

Yes, it depends on whichever frame of reference you are looking from.
If you are on a spaceship travelling at close to the speed of light, you would measure the mass to be it's rest mass.
However an observer on Earth would measure the mass of the spaceship to be greater because of mass dilation, therefore it is a relativistic mass.

The same applies for the Earth.
You would measure the Earth to be more massive because inside your frame of reference, you could assume your spaceship is stationary and that the Earth is moving at the speed your spaceship is moving (close to the speed of light).
However on Earth, it would be measured as its true mass; 6x10^24.

#### malcolm21

##### Active Member
re: HSC Physics Marathon Archive

how would this be done?

#### Kaido

##### be.
re: HSC Physics Marathon Archive

how would this be done?
the easy method is to find frequency (C=flambda)
go up the graph until you meet 2.5eV
aka Al

#### atargainz

##### Active Member
re: HSC Physics Marathon Archive

anyone doing astro, do we need to know the actual chemical equations of the PP and CNO reactions? Or is it enough to know it just in words, ceebs remembering the little numbers and shit

#### Drsoccerball

##### Well-Known Member
re: HSC Physics Marathon Archive

anyone doing astro, do we need to know the actual chemical equations of the PP and CNO reactions? Or is it enough to know it just in words, ceebs remembering the little numbers and shit
Its not required...It's physics not chemistry...

#### InteGrand

##### Well-Known Member
re: HSC Physics Marathon Archive

what about if you are travelling at relativistic speeds on a spaceship and you go past the earth. Will the earth increase its mass by a shit tonne??
To you, yes.

#### astroman

##### Well-Known Member
re: HSC Physics Marathon Archive

anyone doing astro, do we need to know the actual chemical equations of the PP and CNO reactions? Or is it enough to know it just in words, ceebs remembering the little numbers and shit
Just know the main elements, what forms what.

#### godofindolence

##### Member
re: HSC Physics Marathon Archive

Yes, it depends on whichever frame of reference you are looking from.
If you are on a spaceship travelling at close to the speed of light, you would measure the mass to be it's rest mass.
However an observer on Earth would measure the mass of the spaceship to be greater because of mass dilation, therefore it is a relativistic mass.

The same applies for the Earth.
You would measure the Earth to be more massive because inside your frame of reference, you could assume your spaceship is stationary and that the Earth is moving at the speed your spaceship is moving (close to the speed of light).
However on Earth, it would be measured as its true mass; 6x10^24.
Does this means that if we get close to the planet, the gravity would fuck us?

#### astroman

##### Well-Known Member
re: HSC Physics Marathon Archive

Does this means that if we get close to the planet, the gravity would fuck us?
yep.

#### Crisium

##### Pew Pew
re: HSC Physics Marathon Archive

To you, yes.

gg no re I'm gonna quote this and it to my sig later

Someone finally beat InteGrand to answering a post

#### Crisium

##### Pew Pew
re: HSC Physics Marathon Archive

Does this means that if we get close to the planet, the gravity would fuck us?
If you have little or no tangential velocity then you will be pulled towards the centre of the large mass

So yeah gg no re

#### InteGrand

##### Well-Known Member
re: HSC Physics Marathon Archive

gg no re I'm gonna quote this and it to my sig later

Someone finally beat InteGrand to answering a post
Lol not really beat, just that I didn't notice it was answered (was answered roughly an hour before my post)

#### 123ryoma12

##### Member
re: HSC Physics Marathon Archive

for those still awake, what time do you plan on sleeping?

#### malcolm21

##### Active Member
re: HSC Physics Marathon Archive

for those still awake, what time do you plan on sleeping?
1-2am, need a bit of beauty sleep tonight

btw, is there 10, 15 or 20 mc for physics? some papers have differing amounts

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#### InteGrand

##### Well-Known Member
re: HSC Physics Marathon Archive

1-2am, need a bit of beauty sleep tonight

btw, is there 10, 15 or 20 mc for physics? some papers have differing amounts
20 MCQ's. The 15 changed to 20 a few years ago.

#### malcolm21

##### Active Member
re: HSC Physics Marathon Archive

20 MCQ's. The 15 changed to 20 a few years ago.
fml, my worst section by far...

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