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!

Physics hanging around the Earth

  1. Dec 2, 2007 #1
    1. The problem statement, all variables and given/known data
    Someone once considered hanging a rope, (of density p), above the Earth so that it hangs slightly above the ground. How long does the rope need to be (length L)? (mass of the earth = 5.98 * 10^24, Radius of the earth = 6.37 * 10^6, angular velocity of earth equals omega, and density p = .33 kg/m) The rope has both ends free.

    2. Relevant equations
    T^2 = [(4(pi)^2)/(Re^2 * g)] (Re + L/2)

    3. The attempt at a solution
    I thought you could just isolate L from the above equations (one of keplers laws). However, that equation doesn't use the mass of the earth or the density of the rope. So there must be something i'm missing. Some help would be greatly appreciated.
  2. jcsd
  3. Dec 6, 2007 #2

    Shooting Star

    User Avatar
    Homework Helper

    Last edited by a moderator: Apr 23, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Physics hanging around the Earth
  1. Rope around the earth (Replies: 4)