HSC Physics Marathon 2013-2015 Archive (3 Viewers)

[Drsoccerball]

re: HSC Physics Marathon Archive

Its i think

 

[astroman]

re: HSC Physics Marathon Archive

Its i think

thats 0 then

 

[Drsoccerball]

re: HSC Physics Marathon Archive

thats 0 then

The its positive D:

 

[porcupinetree]

re: HSC Physics Marathon Archive

View attachment 31964

Would it be equally acceptable to have a similar diagram but with the light coming from an external source (e.g. lightning strike), and say that the outside observer sees them as simultaneous while the inside observer doesn't?

 

[Kaido]

re: HSC Physics Marathon Archive

Simply 1 + a/g

 

[astroman]

re: HSC Physics Marathon Archive

anyone know how to find thrust?

 

[turntaker]

re: HSC Physics Marathon Archive

anyone know how to find thrust?

Thrust = force. So you can use f=ma or something

 

[el_manu]

re: HSC Physics Marathon Archive

A particle accelerator is capable of accelerating a proton to a speed of 0.99c. Calculate the mass of this proton as measured from the reference frame of the collider.

 

[astroman]

re: HSC Physics Marathon Archive

cheers mate

 

[turntaker]

re: HSC Physics Marathon Archive

A particle accelerator is capable of accelerating a proton to a speed of 0.99c. Calculate the mass of this proton as measured from the reference frame of the collider.

Use mass dilation equation

 

[PhysicsMaths]

re: HSC Physics Marathon Archive

Thrust = force. So you can use f=ma or something

well it's actually sigmaF = ma
so T-mg = ma
and T = ma+mg

 

[turntaker]

re: HSC Physics Marathon Archive

I've almost done all of the hsc questions for space and I haven't seen one which requires you to find thrust. I wouldn't worry

 

[astroman]

re: HSC Physics Marathon Archive

well it's actually sigmaF = ma
so T-mg = ma
and T = ma+mg

so which one's correct? i get different answers with both

 

[astroman]

re: HSC Physics Marathon Archive

I've almost done all of the hsc questions for space and I haven't seen one which requires you to find thrust. I wouldn't worry

its in one of my school's past papers so yea.

 

[el_manu]

re: HSC Physics Marathon Archive

How do i use mass dilation equation?

 

[PhysicsMaths]

re: HSC Physics Marathon Archive

so which one's correct? i get different answers with both

No, this is the derivation process.
I simply explained that the sum of forces acting on a rocket during launch is thrust minus mass due to gravity
So the final equation for thrust is T = mg+ma

 

[astroman]

re: HSC Physics Marathon Archive

How do i use mass dilation equation?

 

[turntaker]

re: HSC Physics Marathon Archive

so which one's correct? i get different answers with both

I think he is right. Mine was partially correct

 

[PhysicsMaths]

re: HSC Physics Marathon Archive

How do i use mass dilation equation?

mv = mo/sqrt(1-v^2/c^2)
When travelling at relativistic speeds, outside observers will see that the mass of the proton increases
So sub mo = mass of proton (from data sheet) and you should get a mass larger than the stated mass

 

[el_manu]

re: HSC Physics Marathon Archive

mv = mo/sqrt(1-v^2/c^2)
When travelling at relativistic speeds, outside observers will see that the mass of the proton increases
So sub mo = mass of proton (from data sheet) and you should get a mass larger than the stated mass

Ah...thx.

Just had a memory lapse which mass was m zero.

and forgot mass of proton was on data sheet.