What is the angular velocity of the Earth? 

                2 pi radians
      omega  =  ------------  =  7.2722052166  x  10^(-5) rad/s
                  86,400 s



 What is the rotational kinetic energy of the Earth? 


      KE     =  (1/2) * I * omega^2

             =  (1/2) * 9.7 x 10^(37) kg * [ 7.2722052166 x 10^(-5) rad/s ]^2

             =  2.564920982579  x 10^(29)  J