Register to reply

Twin Paradox and Time Travel (Special Relativity)

by scurry18
Tags: paradox, relativity, special, time, travel, twin
Share this thread:
scurry18
#1
Oct26-08, 03:41 PM
P: 12
1. The problem statement, all variables and given/known data
Identical twins Speedo and Goslo join amigration from the Earth to Planet X. It is 20.0 light years away in a reference frame in which both planets are at rest. The twins, of the same age, depart at the same time on different spacecrafts. Speedo's craft travels steadily at .950c, and Goslo's travvels at .750c. Calculate the age difference between the twein after Goslo's spacecraft lands on Planet X. Which twin is older?


2. Relevant equations
(1-v^2/c^2)^1/2 x time of travel


3. The attempt at a solution
Speedo travels for 21 years.
Phys.Org News Partner Science news on Phys.org
Flapping baby birds give clues to origin of flight
Prions can trigger 'stuck' wine fermentations, researchers find
Socially-assistive robots help kids with autism learn by providing personalized prompts
borgwal
#2
Oct26-08, 03:43 PM
P: 369
Quote Quote by scurry18 View Post
[b]


3. The attempt at a solution
Speedo travels for 21 years.
That's in the frame of reference in which the planets are at rest. How long does it take on Speedo's clock?
scurry18
#3
Oct26-08, 03:52 PM
P: 12
I'm really unsure on how to figure that out.

borgwal
#4
Oct26-08, 03:56 PM
P: 369
Twin Paradox and Time Travel (Special Relativity)

What concepts that could be relevant here have you encountered so far in special relativity?
scurry18
#5
Oct26-08, 04:11 PM
P: 12
Just the above equation and length contraction
borgwal
#6
Oct26-08, 04:15 PM
P: 369
It's really time dilation that you would use together with your result of "21 years", but length contraction will work, too, in a slightly indirect way.


Register to reply

Related Discussions
Special relativity: twin paradox Special & General Relativity 7
Relativity and the twin paradox Introductory Physics Homework 22
Relativity Question (Twin Paradox) Introductory Physics Homework 3
Relativity Question (Twin Paradox) Special & General Relativity 0
What is the resolution of the The Bug-Rivet Paradox paradox in special relativity? Special & General Relativity 4