Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Angular Speed of Earth when

  1. Mar 13, 2009 #1
    Angular Speed of Earth when....

    1. The problem statement, all variables and given/known data
    Determine the angular speed with which the Earth would have to rotate on its axis so that a person on the equator would weigh 75% of their present weight (Radius of the Earth is 6400 km)

    2. Relevant equations

    wt= mg

    3. The attempt at a solution
    First I did wt=0.75 x m x 9.8, the problem is i cant find any equation that could incorporate weight and angular speed. Can somebody please give me some hints? Any help would be appreciated:) Thankyou very much
  2. jcsd
  3. Mar 13, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Re: Angular Speed of Earth when....

    Centrifugal force = m r w^2 where w is the angular speed in radians/sec.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook