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!

Electromagnetic wave astronaut problem

  1. Jun 3, 2009 #1
    1. The problem statement, all variables and given/known dataAn 80 kg astronaut has gone outside his space capsule to do some repair work. Unfortunately, he forgot to lock his safety tether in place, and he has drifted 5.0 m away from the capsule. Fortunately, he has a 1000 W portable laser with fresh batteries that will operate it for 1.0 hr. His only chance is to accelerate himself toward the space capsule by firing the laser in the opposite direction. He has a 10-hr supply of oxygen.



    2. Relevant equations
    Intensity = P/A
    F=ma
    Electromagnetic wave F =q(E+ V x B)
    E=cB

    3. The attempt at a solution I have tried to solve it for F but the thing is we don't have q and also there is a piece of equation that is missing and I don't know what it is since I couldn't find anything to relate in the book

    Thanks
     
  2. jcsd
  3. Jun 3, 2009 #2

    rock.freak667

    User Avatar
    Homework Helper

    What exactly are you supposed to calculate or find?
     
  4. Jun 3, 2009 #3
    Oh, it's asking when the astronaut will reach the capsule
     
  5. Jun 4, 2009 #4

    Redbelly98

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Looks like you'll need the momentum of the laser beam.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Electromagnetic wave astronaut problem
Loading...