# Does this has anything to do with relativity?

1. Jan 4, 2010

### Idoke

1. The problem statement, all variables and given/known data
The Starship Enterprise, apparently escaping from the clutches of Cthulhu (the image was not altered, this is how it was given!) is flying to the moon at a velocity of 0.7c.
How long will it take (in seconds) for it to get to the moon, as observed from the Earth's frame of reference.
D from Earth to the Moon is 384,000 Km.
At t=0 the ship is over the earth

http://img229.imageshack.us/img229/4001/spaceshiptothemoon.png [Broken]

2. Relevant equations

Time=distance/speed...

3. The attempt at a solution

Am I wrong to assume this has nothing to do with relativistic time dilation or shortening of distances and what-not?
This seems to be a straightforward calculation.
So is this right:
384,000 Km = 3.84*10^8 m
c = 3*10^8 m/s
$$\frac{3.84*10^8}{0.7*3*10^8}$$ = 1.828571428 seconds.

I got this in a relativity assignment so I'm suspicious of this solution.
If I missed something please let me know.

*can't edit the title, obviously should be "have"...

Last edited by a moderator: May 4, 2017
2. Jan 4, 2010

### mgb_phys

In the Earth's reference frame it's just the distance and time.
From the point of view of the crew time would be different.

3. Jan 4, 2010

Thank You!