1. Not finding help here? Sign up for a free 30min 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!

Laser to Moon

  1. Sep 23, 2007 #1
    1. The problem statement, all variables and given/known data
    How long would it take a laser beam to go to the Moon and back if the distance to the Moon is 3.8 x 10^8m?


    2. Relevant equations
    a=2d/t^2
    d=v1 t + 1/2a t^2

    3. The attempt at a solution
    a=2d/t^2
    9.8m/s(Gravity)=2(7.6x10^8)/t^2
    t^2=15.2x10^8/9.8
    t= 12453.99698 secs

    P.S the answer at the back of the book says 2.6sec
     
  2. jcsd
  3. Sep 23, 2007 #2

    hage567

    User Avatar
    Homework Helper

    Why are you including acceleration? Do you know what the speed of light is?
     
  4. Sep 23, 2007 #3
    photons, being massless, are not affected by gravity.... at least not appreciably for your problem
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Laser to Moon
  1. Mass of the moon (Replies: 9)

  2. Trip to the Moon (Replies: 4)

  3. Period of the moon (Replies: 18)

Loading...