# What is the speed of the traveler ?

1. Jul 11, 2008

### kevinlatt

if an object is speeding away from another what is the speed of the traveler if the time dialtion is 1 day = 1000 years. how do i calculate this ?

2. Jul 11, 2008

### Fredrik

Staff Emeritus
Is "the traveler" one of the two objects? (I.e. are you asking for the speed of one of the objects in an inertial frame where the other object is stationary). Is this a homework question? Do you know the formula for time dilation?

3. Jul 11, 2008

### tiny-tim

Welcome to PF!

Hi kevinlatt ! Welcome to PF!

Show us what formulas you know, and what calculations you've tried so far, and then we'll know how to help!

4. Jul 17, 2008

### kevinlatt

no this is not home work. no i do not know the time dilation formula. yes the traveller is one of the objects. it is a theory idea i am personally interested in and ihave no way to prove it. can you help

5. Jul 18, 2008

### tiny-tim

Hi kevinlatt!

Time dilation at speed v:

$$\sqrt{1\ -\ v^2/c^2}$$

6. Jul 18, 2008

### DaveC426913

Or just use this:
http://www.1728.com/reltivty.htm

BTW, your answer will be more a matter of how many 9's there are in the decimal fraction of c (I get at least 11).

Last edited: Jul 18, 2008