Solving Relative Momentum and Rest Mass Confusion

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SUMMARY

The discussion focuses on calculating the speed at which a particle's momentum increases by specific percentages (1%, 10%, and 100%) when starting from an initial speed of 0.58c. The momentum is defined using the equation p = γm0v, where γ is the Lorentz factor. Participants suggest using the ratio of the new momentum to the initial momentum and solving for the new speed based on the desired momentum increase percentages. The correct approach involves setting up equations based on the ratios of momentum and solving for the unknown speed.

PREREQUISITES
  • Understanding of relativistic momentum and the equation p = γm0v
  • Familiarity with the Lorentz factor, γ = 1/√(1 - (v/c)²)
  • Basic knowledge of algebraic manipulation and solving equations
  • Concept of rest mass, m0, in the context of special relativity
NEXT STEPS
  • Study the derivation and applications of the Lorentz factor in relativistic physics
  • Learn how to manipulate equations involving relativistic momentum
  • Explore the implications of momentum changes on particle speeds in special relativity
  • Investigate the relationship between energy and momentum in relativistic contexts
USEFUL FOR

Students and educators in physics, particularly those focusing on special relativity, as well as anyone interested in understanding the calculations related to relativistic momentum and speed changes.

dlucia
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I have been getting rather confused with rest mass, m0. here's the problem.

A particle intially has a speed of 0.58c. A) At what speed does it momentum increase by 1%. B) At 10%, and C) At 100%.

I have set it up as p=γm0v...
then γ=1/ sqrt[1=(0.58)^2

but don't know what to do any further. Thanks
 
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welcome to pf!

hi dlucia! welcome to pf! :smile:

(try using the X2 and X2 buttons just above the Reply box :wink:)

what's the difficulty?

you have momentum = p = po/√(1 - (v/c)2),

so just put p/po = A) 1.01 B) 1.1 C) 2, and solve :wink:
 
dlucia said:
I have been getting rather confused with rest mass, m0. here's the problem.

A particle intially has a speed of 0.58c. A) At what speed does it momentum increase by 1%. B) At 10%, and C) At 100%.

I have set it up as p=γm0v...
then γ=1/ sqrt[1=(0.58)^2

but don't know what to do any further. Thanks[/QUOTE]

Shouldn't it be

\frac{(v/c) γ(v/c)}{0.58 γ(0.58)} = 1.01

\frac{(v/c) γ(v/c)}{0.58 γ(0.58)} = 1.1

\frac{(v/c) γ(v/c)}{0.58 γ(0.58)} = 2.0

Chet
 
Last edited:

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