Earth is the homeworld of the Human race, located in the Sol System. It is the third planet of the system, orbiting at precisely 1 AU from its parent star, a G2-V Main Sequence star known as Sol, or simply The Sun. Contrary to popular belief, Earth is not the Federation's headquarters - it is Mars.
What causes whole body vibration. Drivers of some mobile machines, including certain tractors, fork lift trucks and quarrying or earth-moving machinery, may be exposed to WBV and shocks, which are associated with back pain.
Exposure tovertical vibrations in the 5-10 Hz range generally causes resonance in the thoracic-abdominal system, at 20-30Hz in the head-neck-shoulder system, and at 60-90 Hz in the eyeball. When vibrations are attenuated in thebody, its energy is absorbed by the tissue and organs. The muscles are important in this respect. Vibrationleads to both voluntary and involuntary contractions of muscles, and can cause local muscle fatigue,particularly when the vibration is at the resonant-frequency level.