Transforming Four-Momentum between Inertial Frames

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SUMMARY

The discussion centers on transforming a particle's four-momentum between inertial frames, specifically from an initial frame with four-momentum [E, Px, Py, Pz] = [5 J, 5 N*s, 0, 0] to a frame moving at 0.8c in the +x direction. It is established that the four-momentum does not remain the same across different inertial frames due to the principles of relativistic physics. The Lorentz Transformation is essential for calculating the new four-momentum values, as energy and momentum are interdependent and transform when switching frames.

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Homework Statement


A particle's four momentum in a given inertial frame is [E,Px,Py,Pz]=[5 J, 5 N*s, 0, 0]. What is its four-momtenum in an inertial frame that moves in the +x direction at a speed of .8 c relative to the first frame?

Homework Equations


N/a

The Attempt at a Solution


Isn't the four-momentum of the particle in the other frame just [5 J,5 Ns,0,0] since all components are independently conserved...? or am I making this problem too simple?
Thanks!
 
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No, it's not the same in a different frame. Energy and momentum are conserved in a given inertial frame, but they transform among themselves when you change from one inertial frame to another. Look up the Lorentz Transformation.
 

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