How do I calculate time dilation for objects moving at different velocities?

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SUMMARY

The discussion focuses on calculating time dilation using the formula t' = t * sqrt(1 - v²/c²). A user inquires about determining the time observed by one object moving at 0.6c for another object moving at 0.8c. It is clarified that the relative velocity must be calculated using the relativistic velocity addition formula v' = (u + v) / (1 + (u*v)/c²) rather than simply subtracting the velocities. This distinction is crucial for accurate time dilation calculations.

PREREQUISITES
  • Understanding of special relativity concepts
  • Familiarity with the time dilation formula t' = t * sqrt(1 - v²/c²)
  • Knowledge of the relativistic velocity addition formula v' = (u + v) / (1 + (u*v)/c²)
  • Basic algebra skills for manipulating equations
NEXT STEPS
  • Study the implications of time dilation in high-speed travel scenarios
  • Explore examples of relativistic velocity addition in different contexts
  • Investigate practical applications of time dilation in GPS technology
  • Learn about the Lorentz transformation equations
USEFUL FOR

Students of physics, educators teaching special relativity, and anyone interested in the effects of high-speed travel on time perception.

bfr
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Homework Statement



I'm trying to find out how to use the formula t'=t*sqrt(1-v^2 / c^2) for time dilation.

For example, if object A were moving .8c and object B were moving .6c, would I do .8c-.6c=.2c, and substitute that in for v in the time dilation formula to find the time object B observes for object A?

Homework Equations



t'=t*sqrt(1-v^2 / c^2)
v'=(u+v)/(1+(u*v)/c^2)
 
Physics news on Phys.org
To find the relative velocity you need to use the relativistic law for adding velocities. You don't just add or subtract the velocities. You quoted the formula. Now use it.
 

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