## The relativity of time: time dilation

QUESTION #1:

1. suppose a race on earth was monitored by a spaceship traveling in space at 0.900c relative to the earth and the space travelers measured the time of the race to be 125.6s. What was the time recorded on earth?

2. t = gamma t' where gamma = 1/ sqrt(1-v squared/c squared)

3. v = 0.900c
t = 125.6s??
t' = ???

I stopped here because I am not sure if I have my ts right. I know how to do all the math, just figuring out which t is which is harder for me in this particular question.

QUESTION #2

1. spacecraft is passing through the solar system at speed of 0.850c relative to earth. what does the captain measure for the number of hours in an earth day if the spacecraft is moving a) towards earth and b) away from earth?

2. v = 0.850c
t =???
t' = ???

3. No idea. How does traveling towards or away from earth affect the number of earth hours that one measures? that, i do not understand.

thanks for the help in advance.

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 Quote by Jbum QUESTION #1: 1. suppose a race on earth was monitored by a spaceship traveling in space at 0.900c relative to the earth and the space travelers measured the time of the race to be 125.6s. What was the time recorded on earth? 2. t = gamma t' where gamma = 1/ sqrt(1-v squared/c squared) 3. v = 0.900c t = 125.6s?? t' = ??? I stopped here because I am not sure if I have my ts right. I know how to do all the math, just figuring out which t is which is harder for me in this particular question. QUESTION #2 1. spacecraft is passing through the solar system at speed of 0.850c relative to earth. what does the captain measure for the number of hours in an earth day if the spacecraft is moving a) towards earth and b) away from earth? 2. v = 0.850c t =??? t' = ??? 3. No idea. How does traveling towards or away from earth affect the number of earth hours that one measures? that, i do not understand. thanks for the help in advance.
Don't put two unrelated question under the same thread...i.e. start a new one for new questions.
 yes, i am aware of that thanks. i just happened to accidentally post it in the same thread, but did not know how to remove it.

## The relativity of time: time dilation

They're both time dilation questions, I'd rather not see two topics pertaining to the same concept myself >_>

Keep in mind that on the spaceship in both cases, events on earth would appear to be happening faster

 No idea. How does traveling towards or away from earth affect the number of earth hours that one measures?
Does the previous problem even mention if it's going away or towards, or just "relative to"? Did that make a difference?

Recognitions:
Gold Member