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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

    wf=2pi/T
    wt= mg
    v=wr


    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

    mgb_phys

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    Science Advisor
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    Re: Angular Speed of Earth when....

    Centrifugal force = m r w^2 where w is the angular speed in radians/sec.
     
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