1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Velocity required to reach star in 10 onboard years

  1. Feb 3, 2010 #1
    1. The problem statement, all variables and given/known data

    You wish to travel to the Pleiades (at a distance of 130 pc) in 10 years, according to the clock
    that you carry. How fast do you have to travel to accomplish this (express the velocity as a
    fraction of speed of light, v/c)?

    2. Relevant equations

    \Delta T = \gamma \Delta T_0

    3. The attempt at a solution

    I've been stuck on this for hours, and I really don't know how I'm supposed to set this up. If someone could just help me set it up, I can do all the calculations myself.
  2. jcsd
  3. Feb 3, 2010 #2


    User Avatar
    Homework Helper

    d=vt. You know t=10 years. d can be found via the length contraction formula: to an onboard observer, the distance to the Pleiades seems contracted by a factor of gamma.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook