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: Particle in uniform circular motion

  1. Oct 11, 2013 #1
    1. The problem statement, all variables and given/known data

    A satellite is orbiting 600km above the Earths surface. The free fall speed is 8.21 m/s^2. The radius of Earth is 6400km.

    What is the satellites speed, and the time interval for one orbit around Earth.

    2. Relevant equations

    v = ((2)(PI)(r))/T
    ac = rw^2
    w = (2)(PI) / T

    3. The attempt at a solution

    8.21 = 7000w^2
    w = .0346

    .0346 = (2(PI)) / T
    T = .76

    (2)(PI)(7000) / .76 = 57871.44

    I am unsure of what to do or where I went wrong.
  2. jcsd
  3. Oct 11, 2013 #2


    User Avatar
    2017 Award

    Staff: Mentor

    You should always use units in your calculations. In this case, units would have shown you where the error is.
    (The result should be somewhere around 2 hours or ~7000 seconds, probably a bit less)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted