of 23.93 hours, it has an angular velocity of . The Earth has a moment of inertia, I = . Therefore, it has a rotational kinetic energy of .

Part of the Earth's rotational energy can also be tapped using tidal power. Additional friction of the two global tidal waves creates energy in a physical manner, infinitesimally slowing down Earth's angular velocity ?. Due to the conservation of angular momentum, this process transfers angular momentum to the Moon's orbital